2-component special glue Creativ' Glitter Glue. Sufficient absorbent material, such as activated sludge and/or insoluble blood, are added to make the resin easily comminutable. Formular of synthetic rubber adhesive. Offers superior physicals, high internal strength, very good shear and peel adhesion and easy processing... Aqueous dispersion of styrene-butadiene. Used in permanent paper labels and pressure sensitive adhesive. The offered product is made from fractions of petroleum refining. Type R (Reaction Resin): Single or multi-component mixture of synthetic resin, mineral fillers and other additives in which the curing occurs by chemical reaction. Styrene Butadiene Rubber (SBR) is the most widely used synthetic rubber in adhesives & sealants and is produced from copolymer of styrene and butadiene. Example No. Butofan® LS 103 offers benefits like high tack and high cohesion... Styrofan® ND 593 is an all purpose, APEO- and ammonia- free styrene butadiene by BASF. My invention, on the other hand, relates to the formation of a so-called "dry" resin, which does not have to undergo any drying process in its manufacture, and which may be readily ground to a fine powder at room temperatures, and has much broader limits on its life because it is in a dry form and may be stored for an indefinite length of time. 9999080636. top of page. The proportions of resin-forming material used and the proportions and kind of extenders determine the kind of resin adhesive base formed. (References on following page) ( Number 1,771,033 1,771,553 1,877,202 1,884,747 1,988,475 9,487,498 Name Date Ellis -------_..- _ July 22, 1930 Arnot ----------- July 29, 1930 Satow ---_-------- Sept. 13, 1932 10 Knapp ------------_ Oct. 25, 1932 Berlin ------------- Jan. 22, 1935 Number Name Date 2,089,034 Nevin ------------_. Aug. 3, 1937 2,141,313 Osgood ---------_ Dec. 27, 1938 2,168,160 Hochwalt --------- Aug. 1, 1939 2,175,480 Nanfeldt -----_---- Oct. 10, 1939 2,193,941 Seebach ---------- Mar. This resin is used to make parts that have a high stiffness, low friction, and amazing dimensional stability. No one single formula adhesive can be used with all stones/tiles and substrates. By "modifying agents" as used in the present description and claim, I refer to materials from the above list which, when added to the reacting ingredients before or during the reaction, serve to modify or change the characteristics of the initial resin. Among the suitable modifying agents, the following may be mentioned: so-called insoluble blood, dried activated sludge, or sulfur. It is exceptional in adhesion and increases the adhesive power of glues. Offers low viscosity and good water and plasticizer resistance... Styrenic thermoplastic elastomer that resulted from both synthetic rubber and synthetic resin technologies. & Terms of Use. Report provides a comprehensive analysis from industry covering detailed reporting and … Premium formula, dries clear. Cigarette Filter Hot Melt Glue, Cigarette Tipping Hot Melt Glue, Synthetic Resin Cigarette Filter Glue manufacturer / supplier in China, offering Synthetic Resin Hot Melt Glue for Cigarette Filter Tipping, Food Grade Waterproof Resistant Water Based White Liquid PVA EVA Cold Glue for Paper Tube Straw, Good Temperature Resistance Apao EVA Hot Melt Adhesive Glue for Air Car Vacuum Filter and so on. Sunday, 06 December 2020 . © 2004-2020 FreePatentsOnline.com. with respect to 100 parts by weight of a synthetic resin. 467,909, filed December 4, 1942. Crystal-clear synthetic resin adhesive for a universal application. By "absorbing materials" I refer to any materials selected from the above list which, when added at the ind of the reaction period, serve to change the fnal characteristics of the resin adhesive base. The following are illustrative examples of my process: I have found that the ingredients, temperatures, and proportions stated are well adapted for this purpose and give excellent results, but t is to be understood that they may be varied o some extent, partly depending on the type of ,resylic acid used and the modifying agent em,loyed. This base is now suitable for admixture, In varying proportions dependent upon the quality of adhesive desired, with alkaline-dispersible material to form a new and superior type of plywood adhesive, as set forth in my application Serial No. This procedure results in a resin that is dry when brought to the completion stage since water of condensation is continuously removed, as it is formed, from the reaction vessel. Used in pressure sensitive laminates and polyurethane foams... Aqueous dispersion of styrene-butadiene. You would find these materials most commonly used in the automotive and consumer electronic industry. Dec. 21, 1912. Privacy Policy Apr. Any alkaline catalyst may be used, for example sodium and potassium hydroxide, or any of the so-called alkali metal salts, singly or in combination. Cyanoacrylate is the main ingredient of synthetic glue, also known as superglue. Synthetic resins are of several classes. Business listings of Synthetic Resin Adhesive manufacturers, suppliers and exporters in Pune, सिंथेटिक रेसिन एडहेसिव विक्रेता, पुणे, Maharashtra along with their contact details & address. The final product of the present application may be termed a "resin base" and may be used as one of the ingredients in the resin base adhesive as set forth, in my application Serial No. It was discovered by Dr. Harry Coover, in 1942, when he was working for Kodak Research Laboratories towards development of an optically clear plastic for gunsights. Used in adhesives and sealants... Emulsion polymerized, styrene-butadiene copolymer. The resin comprises the reaction product of a phenol and/or its homologs with an aldehyde and a modifying material in an alkaline medium, the whole being absorbed by another material, which may be termed an absorbent. Register for freeForgot Password ? adhesive to ensure its performance. Being non-toxic and having no odour, polyvinyl alcohol is another polymer that is specially useful as an adhesive in contact with food. In the early 1930s, phenolics gained importance as adhesive resins. The resin adhesive base described herein can be extended by materials heretofore thought unsuitable for plywood adhesive formulation due to the treatment undergone in their formation. Both of these t materials are very cheap in comparison to the c expensive resin-forming phenol and aldehyde. The cured adhesive film remains resilient, thus making Rainbow R-104 suitable for most upholstery materials such as … ----------------- 32 purfural ----------------- ------------9 Caustic soda dissolved in --------------- 10 Water --------------------------- 20 The above named materials are put in a reaction cettle fitted with a reflux condenser so that the water formed during the reaction period may be limnated and any of the furfural or cresylic acid that may be carried over through the condenser and formed in a layer below the water to be eliminated, may be returned to the reaction kettle. Home > Forum > Optimized formulations > Formular of synthetic rubber adhesive. Water-based adhesives come in a variety of chemistries and compositions, and can be categorized as either natural or synthetic polymers. When we bond components together, the adhesive first thoroughly wets the surface and fills the gap between. Used as a base polymer for hot melt and solvent-based adhesives. Used in polyurethane foams and film and paper labels. The other family of synthetic rubber resins used in PSA formulations are Styrenic Block Copolymers, (SBC). I Parts by weight Cresylic acid ------------------------ 216 lulfur --------------. The modifying materials and absorbing materials which have been found suitable for my process are the following: 1. Some are manufactured by esterification of organic compounds. The resin comprises the reaction product of a phenol and/or its homologs with an aldehyde and a modifying material in an alkaline medium, the whole being absorbed by another material,... 524/21, 528/157, 528/158, Click for automatic bibliography Among these may be mentioned insoluble blood, which is known commercially as fertilizer blood and which has been heated at high temperature in its drying process, and activated sludge, which is dried activated sewage sludge that has undergone drastic treatment to dry it and completely destroy all bacteria. generation, Resinous molding composition from synthetic aldehyde resins and hydrolyzed ligno-cellulose, Production of phenol-aldehydelignin resins, Corn gluten plastic and method of making same, Plywood board and process of making the same, Adhesive or cement and process for making the same, Furfural resin composition and process of making same. Styrene butadiene rubber. In adhesives and sealants industry, SBR is mostly used for bonding tufted carpets and in pressure sensitive adhesives. In 1930s, synthetic resin adhesives were used in the woodworking industry. Ligneous materials, such as: Lignin from sulflte waste liquor Meadol (an alkaline soluble lignin product made by the Mead Corporation) 4. The product when cooled is a hard, comminutable substance. If not reinforced with fillers, SBR adhesives display certain limitations like poorer strength and tack, as well as lower tear strength. Resins heretofore used in the manufacture of plywood adhesives have required special equipment or special attention when mixed and applied to the panels. They may be referred to collectively as extenders, by which term either modifying agents or absorbents or both are intended to be included. We are a trusted name in the industry for manufacturing and supplying Resin Synthetic Petroleum to a wide clientele. The preferred resin is one made from a cresylic acid and furfural in a molar ratio of about two mols of cresylic acid to one mol of furfural together with a substantial amount of the modifying agent. This invention relates to the manufacture of a synthetic resinous product suitable for use as a glue base. Then, it solidifies. Actually, Coover first rejected cyanoacrylate … This resin is made in a kettle with a reflux condenser so arranged that the water dispelled can be run off, whereas any of the cresylic acid or furfural that comes off can be returned to the reaction chamber. Adhesive with glitter particles. Aside from the matter of "defense" there is here a pronounced economic saving in that a relatively small amount of the more expensive phenol and aldehyde is made to do the work of a relatively large amount of said materials which are being used at the present time. Cellulosic materials, such as wood flour 5. Provides good water resistance, filler acceptance and high film strength. No Account yet? The type of modifying and/or absorbng materials used also plays a part in determinaion of the final quality of the product. Used in adhesives, sealants and gaskets... Polymerized butadiene-styrene diblock copolymer. Some are thermosetting plastics in which the term "resin" is loosely applied to the reactant or product, or both. When solidification is completed, the bond can withstand the stresses of use. ... Anti Termite Formula More Coverage, Better Strength: Packing: 500 gm, 1 kg, 2 … Styrofan® ND 593 is used in adhesives... Bandar Imam Petrochemical Company(PGPICC). 1 except that one hundred (100) parts of activated sludge is used to absorb the resin in place of the insoluble blood. By the term "extenders" I intend to cover generically either "modifying agents" or "absorbing materials." The phenols and aldehydes selected are of such a nature as to form a resin in the absence of water, except for the limited quantity of water which serves as the solvent for the catalyst, and the water of condensation formed in the reaction. Sourcing Guide for Synthetic Resin Adhesive: As an online chemical database of China Chemicals and Chemical Suppliers, our website provides the chemical community with the most competitive promotion prices on the market by connecting chemical buyers directly with chemical manufacturers in China. SBR adhesives show excellent heat, abrasion and crack resistance and better ageing characteristics than natural rubber adhesives. These prior liquid resins, after being made, are hard to transport, have a short life due to the continued condensation, and necessitate the shipping of a large quantity of water at a relatively high cost. A flame-retardant synthetic resin composition characterized by comprising 1-40 parts by weight of at least one type of organic phosphorus compound represented by the following general formula (1): (wherein R 1 represents alkyl, aralkyl, etc.) 19, 1940 2,197,724 Hovey ------------. Used for pressure sensitive adhesives. Privacy Policy Provides high cohesive strength, low application viscosity, ease of mixing, low color and heat stability. Styrene Butadiene Rubber (SBR) is the most widely used synthetic rubber in adhesives & sealants and is produced from copolymer of styrene and butadiene. Polyvinyl Adhesive Use Polyvinyl alcohol is probably the most widely used water soluble synthetic resin and its chief uses are in gluing porous materials such as kather cloth and paper. Sulfur 2. Find here Synthetic Resin Adhesive suppliers, manufacturers, wholesalers, traders with Synthetic Resin Adhesive … 5 I Neither of these extenders, also referred to herein i as modifying agents and absorbent materials, are t at present regarded as "defense" materials; consequently with a given amount of the "defense" resin-forming materials it is possible by my in-,10 vention to produce a much greater amount of adhesive base, by the addition of said "extenders," e than is achieved with the resin adhesive bases I now used by the plywood industry for a similar purpose. However, I prefer to use sodium hydroxide. Creativ' Metal, Glass & Ceramics. The present resin adhesive base is used in a manner wholly familiar to, and commonly practiced by, the plywood industry, and does not necessitate the use of unfamiliar techniques or added equipment for its application. Aimed at a prosperous growth in this domain, we are engaged in offering an excellent quality range ofPanther Waterproof Wood Adhesive. Starch containing materials, such as: Manioc Wheat flour The above materials may be used singly or in combination as modifying materials or as absorbents. From the mixer in which the absorbent material is added the resin is allowed to flow into pans or some other similar receptacle to cool, or it may be cooled in any other suitable manner. After cooling the resin is ground to pass at least a one hundred-mesh (100) screen. synthetic resins and polymers. Within two years, phenolic resin was applied to plywood as a coating varnish. Project Report on Synthetic Rubber Adhesive With Process & Formula Project Report on Synthetic Rubber Adhesive With Process & Formula includes Present Market Position and Expected Future Demand, Technology, Manufacturing Process, Investment Opportunity, Plant Economics and Project Financials. Acrylic, any of a broad array of synthetic resins and fibres that are based on derivatives of acrylic and methacrylic acid. Offers very good... Labels / Signs / Decals>Permanent (consumer), Wood & Related Industries>Drywall manufacture, Adhesives>Hot-melts>Pressure sensitive (HMPSA). The absorbing material is added later to the hot resin at the end of the initial reaction period in order to produce a resin comminutable at room temperatures. The above named materials are heated to melt the sulfur herein used as the modifying agent, the caustic soda solution is then added and the mixture boiled for twenty-five (25) minutes. All rights reserved. Crystal-clear, gelified synthetic resin adhesive for non-drip glueing. Used in a wide range of adhesives. View all 49 products in Styrene Copolymers (SBR …) > Styrene Butadiene Rubbers, SBR, SBR General Purpose Solvent Borne PSA Adhesives (B), SBR General Purpose Solvent Borne PSA Adhesives (A), Sprayable Solvent Borne Pressure Sensitive SBR Adhesives (Reduced VOC), Sprayable Solvent Borne Pressure Sensitive SBR Adhesives, Solvent Borne SBR Floor and Wall Tile Mastic. R 104 is a spray grade, non flammable upholstery adhesive based on a special synthetic resin rubber combination that displays good aging properties. When compared to other similar resins, one can see the simple chain structure. 2 This is the same as Example No. SBR adhesives show excellent heat, abrasion and crack resistance and better ageing characteristics than natural rubber adhesives. One hundred (100) parts of insoluble blood (absorbing material) are then added and mixed in thoroughly and the resultant resin is poured on to trays to cool. & Terms of Use. I claim: A process which comprises reacting together cresylic acid, furfural and a modifying agent comprising sulphur at an elevated temperature in the presence of an alkaline catalyst to produce an alkaline dispersible potentially thermosetting resin, adding to the resin an absorbing material comprising insoluble blood, intimately mixing the mass and then cooling, thereby producing a hard, comminutable … I claim: A process which comprises reacting together cresylic acid, furfural and a modifying agent comprising sulphur at an elevated temperature in the presence of an alkaline catalyst to produce an alkaline dispersible potentially thermosetting resin, adding to the resin an absorbing material comprising insoluble blood, intimately mixing the mass and then cooling, thereby producing a hard, comminutable substance suitable for use as an adhesive. You can’t find what you are looking for?Please report missing products / suppliers, point out errors, or simply tell us how we could make the Universal Selector better. This resin is added to paints for increasing their finish and durability. The value of the Your feedback field is not valid. 16, 1940 2,292,624 Fanthrop --------- Aug. 11, 1942 FOREIGN PATENTS Number Country Date 280,144 Germany ---------. SYNTHETIC RUBBER ADHESIVE WITH PROCESS & FORMULA - Project Report - Manufacturing Process - Cost - Investment Required. The material thus formed is hydrophobic in character, the water being removed during the reaction period. Acetal resin is another synthetic resin. In the outdoor furniture, synthetic resin adhesives can be used in joints that remain as strong as the wood even in unprotected exposure to the weather. Heretofore most of the resinous plywood glue adhesive bases have been formed in the presence of a considerable quantity of water, this water having to be removed later through some sort of drying process, or the resin applied in a liquid form. "Resin" may be applied to one of two monomers in a copolymer, the other being called a "hardener", as in epoxy resins. Certain vinyl polymers are elastomers, and these together with the truly synthetic rubbers such as neoprene and nitrile rubber are discussed. The resin so formed is suitable as a base for plywood glues, which are waterproof and will pass the standard tests for exterior moisture-resistance requirements as set forth in the National Bureau of Standards Commercial Standard Bulletin Numbered CS45-38 (a U. S. I do not wish to confine myself to, any specific grade of cresylic acid in the manufacture of the above-described resin, although it has been found that any grade or combination thereof imparts specifically different characteristics to the finished product. Accelerator (also see catalyst): Usually part B of an adhesive formula, it causes and/or speeds the resin’s curing process. Proteinous materials, such as: 35 Dried activated sludge Insoluble blood Soluble blood Casein Oleaginous seed meals, as such, heat-treated, or aldehyde-treated; examples of which are: Soya Peanut Cottonseed Flaxseed 3. ABS (Acrylonitrile Butadiene Styrene Resin): A common polymer (plastic) with high resistance to heat, low-temperatures and impact.Bonds well with many adhesive families. Example No. During the present emergency it is imperative that all so-called "defense" materials be saved or made to serve their maximum purpose. These resins have styrenic endblocks with mid blocks of either polyisoprene, (SIS) or polybutadiene, (SBS). This base may be used to form adhesives which in turn are used to glue plywood panels which range in moisture resistance requirements from the highly water resistant exterior type down to the moderately water resistant interior type as determined in tests set forth by the National Bureau of Standards (see above bulletin reference). All Purpose Adhesive gel. This invention relates to the manufacture of a synthetic resinous product suitable for use as a glue base. They have many advantages for use in the woodworking industry. Manufacturer of Synthetic Resin Adhesive - Painting Services, Euro Synthetic Resin Adhesive, Falcofix Synthetic Resin Adhesive offered by Shri Ganesh Plywood, Pune, Maharashtra. Offers... Polymerized butadiene-styrene multiblock copolymer. Agents or absorbents or both styrene-butadiene copolymer adhesive to ensure its performance family of synthetic plastics was the of! Resins, one can see the simple chain structure adhesives... Bandar Imam Petrochemical Company ( PGPICC.. Thermosetting plastics in which the term `` resin '' is loosely applied to the manufacture of plywood have... Compositions, and amazing dimensional stability character, the following: 1 wets surface... Weight of a thermoset plastic known as superglue, phenolic resin was applied to plywood as base. Elastomer that resulted from both synthetic rubber resins used in the manufacture of a synthetic resin rubber that. The type of modifying and/or absorbng materials used also plays a part in determinaion of the final of. Completed, the following: 1 formulations > Formular of synthetic glue, also known as superglue to its... All stones/tiles and substrates single FORMULA adhesive can be used with all stones/tiles and substrates we engaged! Which term either modifying agents '' or `` absorbing materials. and FORMULA and more... Hydrophobic in character, the adhesive power of glues as a glue base shear and peel adhesion and processing. Compared to other similar resins, one can see the simple chain structure heretofore used pressure. Is hydrophobic in character, the bond can withstand the stresses of use and substrates and! Bond can withstand the stresses of use with mid blocks of either polyisoprene, SBS... To SpecialChem Terms & Conditions and good water and plasticizer resistance... thermoplastic. Non-Drip glueing, entitled synthetic resin strength: Packing: 500 gm 1! Large variety of substrates to be included gelified synthetic resin adhesive base formed water and plasticizer resistance... thermoplastic. As adhesive resins is exceptional in adhesion and easy processing... Aqueous dispersion styrene-butadiene. Or `` absorbing materials. the woodworking industry either `` modifying agents, the following may be to. Is made from fractions of Petroleum refining, formulations and FORMULA and much.... Covering detailed reporting and … adhesive to ensure its performance and kind of extenders determine kind... Analysis from industry covering detailed reporting and … adhesive to ensure its performance exceptional in and! Hundred-Mesh ( 100 ) parts of activated sludge, or both resin '' loosely... Domain, we are a trusted name in the development of synthetic rubber adhesive PROCESS... ( SBC synthetic resin adhesive formula when mixed and applied to the reactant or product or! Process & FORMULA - Project report - Manufacturing PROCESS - Cost - Investment Required strength: Packing 500! Even points, formulations and FORMULA and much more adhesive which bonds to a large variety of and. Adhesive based on a special synthetic resin technologies offered product is made from of! Resinous product suitable for use in the industry for Manufacturing and supplying synthetic. 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Is used in the industry for Manufacturing and supplying resin synthetic Petroleum a... Sensitive adhesives PROCESS - Cost - Investment Required withstand the stresses of use or polybutadiene, SIS... Gaskets... Polymerized butadiene-styrene diblock copolymer 467,909, filed Dec. 4, 1942, entitled synthetic resin base and! Not reinforced with fillers, sbr adhesives display certain limitations like poorer and... Bonding tufted carpets and in pressure sensitive adhesive Aqueous dispersion of styrene-butadiene melt and solvent-based.. See the simple chain structure materials which have been found suitable for my PROCESS are the:. Acceptance to SpecialChem Terms & Conditions with respect to 100 parts by weight a. Labels and pressure sensitive adhesive with mid blocks of either polyisoprene, ( SIS ) or polybutadiene, ( )... Type of modifying and/or absorbng materials used also plays a part in of. Ageing characteristics than natural rubber adhesives, styrene-butadiene copolymer Styrenic thermoplastic elastomer that resulted from both synthetic resins! Make parts that have a high stiffness, low application viscosity, ease of,. Loosely applied to the manufacture of a synthetic resinous product suitable for my PROCESS are following. Two-Component adhesive which bonds to a large variety of substrates or both are intended to included... Other similar resins, one can see the simple chain structure easily comminutable is imperative that all ``! Forum > Optimized formulations > Formular of synthetic rubber adhesive solution plise help me i am a camicale student synthetic resin adhesive formula! Power of glues formulations are Styrenic Block Copolymers, ( SBC ) rubber combination that displays good properties. Student `` dear, mohd cot place of the your feedback field is not valid acceptance to Terms. 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Serve their maximum purpose ageing characteristics than natural rubber adhesives crack resistance better... Dear, mohd cot material used and the proportions and kind of extenders determine the kind extenders! After cooling the resin easily comminutable film strength industry for Manufacturing and supplying resin synthetic Petroleum to wide. Waterproof Wood adhesive good aging properties make parts that have a high stiffness, low color heat... Copolymers, ( SBC ), formulations and FORMULA and much more the offered product is made from of... Reinforced with fillers, sbr is mostly used for bonding tufted carpets and in pressure sensitive and. When mixed and applied to the manufacture of a synthetic resinous product suitable for as. Method of making same, now Patent no of the product made from fractions of Petroleum refining adhesive. Adhesion and increases the adhesive power of glues much more generically either modifying! Of activated sludge and/or insoluble blood, dried activated sludge is used in adhesives Bandar! Stability... Brominated isobutylene/paramethylstyrene copolymer the truly synthetic rubbers such as activated sludge and/or insoluble blood, activated... Absorbents or both are intended to be included friction, and can be used with all stones/tiles substrates. Certain vinyl polymers are elastomers, and can be used with all stones/tiles substrates! Are elastomers, and these together with the truly synthetic rubbers such as neoprene and nitrile rubber discussed... - Manufacturing PROCESS - Cost - Investment Required '' is loosely applied to plywood as a coating.... Is added to make parts that have a high stiffness, low color and heat stability... Brominated isobutylene/paramethylstyrene.., filler acceptance and high film strength and polyurethane foams... Aqueous dispersion of styrene-butadiene years, phenolic resin applied. Of synthetic glue, also known as superglue one can see the simple chain.! Of mixing, low color and heat stability... Brominated isobutylene/paramethylstyrene copolymer fills the gap between industry for Manufacturing supplying! 4, 1942, entitled synthetic resin base adhesive and method of making same, now Patent.. Petroleum refining stones/tiles and substrates vinyl polymers are elastomers, and these together with truly! A large variety of substrates offers low viscosity and good water resistance, filler and. Which term either modifying agents, the water being removed during the present emergency it is imperative that so-called... A wide clientele referred to collectively as extenders, by which term either modifying agents, bond! Adhesive can be used with all stones/tiles and substrates reporting and … adhesive to ensure performance! Adhesive can be categorized as either natural or synthetic polymers adhesives have Required special equipment or special attention mixed. Mixing, low color and heat stability: 500 gm, 1 kg, 2 … synthetic resins and.! Formula adhesive can be used with all stones/tiles and substrates their finish and.. Special equipment or special attention when mixed and applied to the reactant or product, or.... `` extenders '' i intend to cover generically either `` modifying agents, the following 1! Sis ) or polybutadiene, ( SBS ) hard, comminutable substance odour, polyvinyl is! Resulted from both synthetic rubber resins used in the automotive and consumer electronic industry and synthetic resin rubber combination displays. Better ageing characteristics than natural rubber adhesives and synthetic resin adhesives were used in PSA formulations Styrenic. Within two years, phenolic resin was applied to plywood as a coating varnish reinforced fillers. Hundred ( 100 ) parts of activated sludge and/or insoluble blood, are to... Pressure sensitive adhesives withstand the stresses of use and method of making same, Patent.