Abstract: This invention relates to a curable latex composition, films and foams produced therefrom and method for preparing said curable latex composition. The composition comprises a carboxylated latex, an epoxy resin emulsion containing an organo-soluble or organo-miscible catalyst and a water-soluble catalytic curing agent. The carboxylated latex comprises a copolymer of from 0 to 75 percent by weight of a vinyl aromatic monomer, from 0 to 85 percent by weight of a diene monomer and from 0.5 to 25 percent by weight of an ethylentically unsaturated carboxylic acid monomer, all weight percentages based on the total weight of the copolymer. The latex is produced by emulsion polymerization of one or more monomers in an aqueous environment. The various components of the curable latex composition may be maintained separately until shortly before use because of their ambient temperature curing properties. In some instances two or more components which do not react with each other can be premixed.

Abstract: This invention relates to a novel composition comprising a water- and caustic-insoluble, inswellable, fibrous, particulate polymer comprising cross-linked units of a water-soluble polymer and a water-soluble cationic poly(diallylamine)-epichlorohydrin resin. This polymer is useful as an exchange resin, tablet disintegrant, thickener and suspending aid.

Abstract: Aqueous thermosetting coating compositions are disclosed in which water has dispersed therein: (1) an acidic hydroxy-functional resin dispersed in water as a salt with a volatile base; (2) a curing agent reactable with the hydroxy groups of the hydroxy-functional resin to cure the same, this curing agent being dispersed in the aqueous medium containing said component (1); and (3) an aqueous emulsion of cross-linked emulsion copolymer comprising, by weight: (A) from 2% to 20% of polyethylenically unsaturated monomer; (B) from 3% to 30% of hydroxy-functional monoethylenically unsaturated monomer (C) from 0% to 20% of monoethylenically unsaturated carboxylic acid monomer; and (D) the balance of the copolymer consisting essentially of copolymerizable nonreactive monoethylenically unsaturated monomer. The emulsion is used to provide the emulsion copolymer in an amount of from 10% to 80% of the total weight of resinous material.

Abstract: The invention relates to a process for coating an electrically conductive substrate, the said substrate being immersed in an aqueous bath based on a cationic synthetic resin binder which is at least in part neutralized with acids and contains amino and/or hydroxyl groups. The said bath contains a mixture of crosslinking agents as well as pigments, fillers, corrosion inhibitors, paint auxiliary substances, and, if appropriate, catalysts, as well as organic solvents in an amount of up to 15% by weight based on the total weight of the coating, the said substrate being cathodically connected. By the action of direct current, a film is deposited on the substrate, after which the said substrate is removed from the bath and the film is cured by stoving, the mixture of crosslinking agents comprising at least two crosslinking agents of different reactivities based on activated esters and/or polyisocyanates blocked by different blocking agents.

Abstract: A two component water-based composition which cures in two stages, an initial rapid curing stage and a slower curing stage, comprising as the first component, a mixture of a polyaldehyde chosen from the group consisting of glyoxal glutaraldehyde and derivatives of glyoxal and gluteraldehyde, and a water dispersible component chosen from the group consisting of poxy resin emulsions which can be emulsified in water, synthetic latexes stable at about pH 7 or less, low molecular weight resin emulsions, epoxy ester emulsions, water emulsified alkyds, and cationic, anionic and non-ionic asphalt emulsions and, as the second component, the non-gel reaction product of N,N'-bis(methoxymethyl) uron and a polyamine chosen from a group consisting of primary and secondary amines and/or a monoamine.

Abstract: A non-water dispersible, oxirane-defunctionalized, etherified, phosphoric acid ester of an epoxy resin is useful in enhancing the adhesion of aqueous thermosetting coating compositions useful as a varnish or white coating for drawn and ironed aluminum containers. The epoxy resin ester is prepared by reacting(a) an epoxy resin having an epoxy equivalent weight of at least about 190;(b) orthophosphoric acid in an amount of 0.2 to 0.45 equivalents per equivalent of epoxy resin;(c) at least about 0.65 equivalents, per equivalent of epoxy resin, of a reactive hydroxyl-functional compound having at least one hydroxyl group reactive with an oxirane group of said epoxy resin, said hydroxyl-functional compound being a solvent for said epoxy resin and for the non water-dispersible, defunctionalized, etherified, phsophoric acid epoxy resin ester reaction product; and(d) water in an amount of 0-20% of the weight of the orthophosphoric acid.

Abstract: The invention relates to a heat-curable binder mixture which comprises an organic synthetic resin A and a crosslinking agent B. Said synthetic resin A can be an epoxy resin, a polyester resin or an acrylate resin having a number average molecular weight of 500 to 20,000 and at least 0.2 equivalent per 100 g of resin of primary and/or secondary amino groups and/or hydroxyl groups, and said crosslinking agent B is an organic compound having at least 2 .beta.-alkoxyalkyl ester groups per molecule.

Abstract: A two-part aqueous-based adhesive suitable for dry-bonding a polyether urethane foam to a rigid or semi-rigid substrate consists essentially of (a) an aqueous latex of an anionic emulsion polymer having a Tg of 0.degree. C. or below, preferably -5.degree. to -30.degree. C., an effective amount of a diepoxide or polyepoxide curing agent, and optionally, but preferably, an effective amount of a fugitive plasticizer. The polymer consists essentially of about 10-30% ethylene, 40 to 80% of vinyl acetate, 5-35% of a C.sub.4 -C.sub.8 -dialkyl maleate, and 4-10% of an ethylenically unsaturated acid monomer (e.g., acrylic acid). Suitable substrates include styrene board and fiberglass board.

Abstract: Heat curable coating compositions particularly suitable as coatings for metal can ends are made from aqueous dispersions of epoxy resins, acrylic resins which are copolymers of polymerizable acids and other monomers, and alkylated phenol novolac resins.

Abstract: The invention relates to binders for cathodically depositable coating compositions for the electrocoating lacquering process using cationic synthetic resins, which binders have been obtained by polymerizing (A) 5 to 95% by weight of ethylenically unsaturated polymerizable monomers in the presence of (B) 95 to 5% by weight of a cationic synthetic resin in an aqueous phase, the total amount of the components (A) and (B) being 100%.Esters of acrylic acid and/or methacrylic acid are preferable for use as component (A). The invention also relates to a process for preparing the binders and to their use for cathodically depositable electrocoating lacquers.

Abstract: Polymer composition particularly useful as protective surface coatings comprise an aqueous mixture of epoxy-acrylic graft copolymers combined with a functional low molecular weight polyester and minor amounts of an amine derivative crosslinking resin. The low molecular weight polyester contains reactive hydroxyl or carboxyl functional groups and a molecular weight less than about 2,000.

Abstract: An aqueous dispersion of a tertiary amine terminated polyether and a carboxylic acid functional polymer. The tertiary amine terminated polyether is the product of the reaction of the epoxy group of an epoxy resin with the hydroxy group of a hydroxy functional tertiary amine and the carboxylic acid functional polymer is present in an amount sufficient to render the combination water dispersible.A process for producing the aqueous dispersion is also described, together with coating compositions based on the dispersion. These coating compositions are particularly useful in the lining of metal containers for food and beverages.

Abstract: A process for treating glass containers, consisting of applying to the surface of the said containers, heated to a temperature of 80.degree. to 150.degree. C., a composition containing (a) a chemically drying binding agent consisting of an emulsifiable liquid or solid epoxy resin and either a water-soluble polyaminoamide resin having an amine index between 150 and 200, or an organosoluble solid amine adduct, or a mixture of the two and (b) a physically drying binding agent consisting of a cationic emulsion containing an acrylic polymer or a polyurethane.

Abstract: Aqueous dispersions useful as can coating compositions are made from the ammonia or amine salt of a carboxyl functional acrylic copolymer blended with phenolplast resins, polyepoxide resins partially reacted with a monofunctional acid and, optionally, an epoxidized hydrocarbon or vegetable oil.

Abstract: Disclosed herein are water-based coatings comprising as an essential film-former resinous blends of acid group-containing resins and modified epoxy resins which have been found to be particularly useful as electrodepositable compositions for can coatings.

Abstract: Disclosed are gelled aqueous compositions having (1)(a) a water thickening amount of an anionic or nonionic water soluble polymer in fresh water or brine solutions at a pH of greater than 10; (b) a water thickening amount of an anionic water soluble polymer having carboxylate functionality and a cellulose backbone in brine solutions at an acidic pH; or (c) a water thickening amount of (i) an anionic water soluble polymer having carboxylate functionality and a cellulose backbone or (ii) a copolymer of sodium acrylate having from about 10% to about 90% acrylate content, in brine solutions at neutral to about 10 pH; and (2) a water soluble cationic poly(diallylamine)-epichlorohydrin resin in an amount sufficient to cause gelation and form the gelled composition. The compositions are useful in the recovery of oil and gas by fracturing and as a matrix plugging agent in enhanced oil recovery.

Abstract: A composition for bonding metal powders which is used in an amount of at most about 7 parts by weight as the solids content per 100 parts by weight of a metal powder for obtaining a flexible metal powder molding which is capable of tolerating deformation at a radius of curvature of up to 15 mm, the composition comprising as a main monomer an acrylic polymer having a weight average molecular weight of about 50,000 to 1,500,000 which comprises alkyl (meth)acrylate having an average carbon atom number of 3 to 12 in the alkyl moiety, or a mixture of the acrylic polymer and a resin which gives adhesive property, as a main component, the main component having a glass transition temperature in a range of about -70.degree. to -10.degree. C. and an elastic modulus in a range of about 0.05 to 50 kg/cm.sup.2 at 25.degree. C.

Abstract: Aqueous coating composition comprising water insoluble resinous powder, aqueous resin, pigment and other optional additives including hardener, characterized by the fact that said water insoluble resinous powder is composed of a polymer obtained by reacting a mixture of epoxy resin and a resin having epoxy reactive functional groups, or a resin having both epoxy groups and epoxy reactive functional groups, with an amine in an amount sufficient to cause ring-opening of 10 to 50% of the total epoxy groups, or composed of carboxyl bearing resin admixed and reacted with high boiling basic compound. These compositions are excellent in storage stability, application characteristics and film performance.

Abstract: An aqueous coating composition which comprises a carboxy group-containing resin powder (I), a basic compound (II) and an aqueous resin (III), optionally with a reactive compound (IV) to at least one of the resin powder (I) and the aqueous resin (III), in an aqueous medium, the basic compound (II) being contained in an amount of 0.4 to 1.2 equivalents to the carboxy group in the resin powder (I) so as to disperse the resin powder (I) into the aqueous medium and the weight proportion of the resin powder (I) and the aqueous resin (III) being from 2:98 to 98:2. The coating composition thus obtained is excellent in storage stability and workability and can provide a coating film having good performances.

Abstract: An aqueous resin dispersion prepared by dispersing in an aqueous medium in the presence of ammonia or an amine a composite resin composition comprising carboxylic groups in an excessive amount and a reaction product obtained by at least partially reacting a specific acrylic resin (A), a specific aromatic epoxy resin (B) and a specific phenolic resin (C),characterized in that the acrylic resin (A) and the aromatic epoxy resin (B) are at least partially reacted with each other, and the phenolic resin (C) is pre-condensed with the acrylic resin (A) or aromatic epoxy resin (B).

Abstract: Non-aqueous dispersions are disclosed which contain (A) a relatively high molecular weight epoxy resin, (B) a non-aqueous dispersion medium, and (C) a dispersant such as a copolymer of (1) at least one polymerizable ethylenically unsaturated monomer containing a group reactive with an epoxy group and (2) at least one polymerizable ethylenically unsaturated monomer free of any groups reactive with an epoxy group.These dispersions are useful in coatings, electrical or structural laminates or composites, body solders, adhesives, caulking compounds, casting compounds, filament winding and the like.

Abstract: Disclosed are carboxylic acid containing polymeric microgel particles which are prepared by polymerizing in aqueous emulsion a monomer mixture containing about 10-50% by weight of polymerizable carboxylic acid monomers, up to 5% of a difunctional crosslinking monomer and one or more carboxyl-free relatively water insoluble polymerizable vinyl monomers. The resulting microgel particles are water-swellable and may be employed as stabilizers for use in the preparation of aqueous dispersions of film-forming resins containing smaller amounts of organic solvents than conventional aqueous dispersions of this type. Such dispersions are useful as coating compositions, yielding coatings having less water sensitivity and improved adhesion as compared with coatings obtained from conventional aqueous dispersions of film-forming resins.

Abstract: Non-gelled compositions containing hydroxy ester copolymer having carboxyl groups and substantially free of oxirane groups are disclosed which are the esterification reaction product of(A) acidic addition copolymer; and(B) mixtures containing epoxy resin including both aromatic polyether containing oxirane groups and aromatic polyether devoid of oxirane groups, in which the mixture comprises at least 40% of the total resin solids and contains insufficient oxirane groups to react with all of the carboxyl groups in the copolymer. The resulting composition is neutralized with amine, is self-emulsifiable in water and is useful for coating, e.g., for cans.

Abstract: Disclosed are carboxylic acid containing polymeric microgel particles which are prepared by polymerizing in aqueous emulsion a monomer mixture containing about 10-50% by weight of polymerizable carboxylic acid monomers, up to 5% of a difunctional crosslinking monomer and one or more carboxyl-free relatively water insoluble polymerizable vinyl monomers. The resulting microgel particles are water-swellable and may be employed as stabilizers for use in the preparation of aqueous dispersions of film-forming resins containing smaller amounts of organic solvents than conventional aqueous dispersions of this type. Such dispersions are useful as coating compositions, yielding coatings having less water sensitivity and improved adhesion as compared with coatings obtained from conventional aqueous dispersions of film-forming resins.

Abstract: A washcoat composition suitable for application to tin-plated mild steel consists of an aqueous carrier medium and a binder comprising specified relative proportions of (A) a thermosetting acrylic polymer in the form of a sterically stabilized dispersion in the aqueous medium and (B) an epoxy resin, the composition additionally containing an acid catalyst, in particular phosphoric acid or chromic acid or an ammonium or amine salt thereof.

Abstract: Disclosed are carboxylic acid containing polymeric microgel particles which are prepared by polymerizing in aqueous emulsion a monomer mixture containing about 10-50% by weight of polymerizable carboxylic acid monomers, up to 5% of a difunctional crosslinking monomer and one or more carboxyl-free relatively water insoluble polymerizable vinyl monomers. The resulting microgel particles are water-swellable and may be employed as stabilizers for use in the preparation of aqueous dispersions of film-forming resins containing smaller amounts of organic solvents than conventional aqueous dispersions of this type. Such dispersions are useful as coating compositions, yielding coatings having less water sensitivity and improved adhesion as compared with coatings obtained from conventional aqueous dispersions of film-forming resins.

Abstract: Disclosed is a water-based thermosetting epoxy composition of a water compatible epoxy resin, about 5 to about 35%, based on a total solids, of a water compatible impact modifier, about 1.5 to about 7%, based on the weight of the epoxy resin, of a water compatible epoxy hardener, up to about 0.3%, based on the weight of the epoxy resin, of a catalyst, and sufficient water to provide a viscosity of about 100 to about 500 centipoises. The impact modifier is a copolymer of about 10 to about 60% ethylene, propylene, or mixtures thereof, and about 40 to about 90% vinyl acetate, vinyl chloride, or mixtures thereof. Also disclosed are laminates prepared from this composition and a method of preparing them.

Abstract: An aqueous coating composition comprising, as film-forming components, at least one water soluble resin and at least one water-insoluble finely pulverized resin, one of said water soluble resins having certain specified tolerance and surface tension properties. This coating composition is very stable, shows excellent working properties, such durability and exhibits other desirable properties, and is useful as a coating, especially in the automobile industry.

Abstract: Aqueous compositions suitable for use as sanitary container coatings are prepared by reacting epoxy resin and a carboxyl containing acrylic resin in the presence of a polyfunctional tertiary amine. The compositions made with polyfunctional amine have lower viscosities than those made with monofunctional amine, an advantage in preparing high solid coatings for roll application, for example.

Abstract: Sanitary coatings based on self-emulsifiable epoxy ester copolymers are produced by esterifying a solvent-soluble carboxyl polymer with an epoxy resin in an organic resin and in the presence of at least about 2% amine catalyst to provide a carboxyl-functional epoxy polymer which can be reacted with a base and dispersed into water.

Abstract: An improved, stabilized container coating composition of an amine solubilized hydrosol resin solution of:(a) an acrylic-poly(vinyl acetal) co-resin having a number average molecular weight above 10,000 and a glass transition temperature of -20.degree. C. to +60.degree. C.;(b) an epoxy resin having a molecular weight of 300 to 8,000; and on the average 2 or less than 2 epoxy groups per molecule; and(c) an aminoplast, a phenolplast resin, or combination thereof.

Abstract: A method for reducing extractable constituents of an undesirable monomer in compositions which comprise an ionic polymer and an addition polymer of the undesired monomer which comprises conducting an addition polymerization in the presence of the undesired monomer with another monomer which is copolymerizable therewith and which results in a less undesirable residue or a residue which is more easily removable, is disclosed.

Abstract: Disclosed is an aqueous coating resin composition to be applied to a metal substrate, particularly an inner surface of a metal can or can closure on which an undercoating layer is formed.

Abstract: A water dispersible coating composition is prepared by reacting together at elevated temperature in the presence of an amine 40 to 90% by weight of an epoxy resin composition of average epoxy functionality 1.0 to 2.0 epoxide groups per molecule and 10 to 60% by weight of a polymer containing carboxylic acid groups. The ratio of carboxylic acid groups to epoxide groups is 1.5:1 to 20:1. The reaction is carried out in a mixture of a water miscible organic solvent with 5 to 30% of water based on the combined weight of epoxy resin and polymer containing carboxylic acids groups. A coating composition in the form of a stable dispersion is produced by mixing the water dispersible coating composition prepared as described above with a base and sufficient water to form a predominantly aqueous continuous phase.

Abstract: Aqueous compositions suitable for sanitary can coatings comprising the neutralized water dispersible ionic polymer product of the reaction of an epoxy resin with acid polymer, and a different resin which is not necessarily self-dispersible in water, as well as several methods of preparing such compositions, are disclosed. The second resin which is not necessarily self-dispersible in water is introduced either preformed at any stage or is prepared, in situ, in the presence of the epoxy resin esterified with acid polymer either before the ionic epoxy resin-acid polymer product is dispersed in water. The epoxy resin-acid polymer product acts as a polymeric surfactant capable of keeping even a normally non self-dispersible second polymer in stable dispersion in water.

Abstract: An improved process for preparing epoxy acrylate dispersions from the reaction product of an epoxy resin and carboxyl containing polymer in the presence of tertiary amine in which the carboxyl containing polymer is formed, in situ, in the presence of a solvent solution of the epoxy resin and then subjected to the esterification reaction which can be conducted in a single pot.

Abstract: The product and process is directed to polymerizing second stage ethylenically unsaturated monomers within an aqueous dispersion of a preformed epoxy based resinous material comprising a mixture of graft epoxy polymer containing grafted addition polymer grafted to the epoxy backbone, ungrafted epoxy polymer, and ungrafted addition polymer uniformly dispersed in water wherein the second stage monomers are polymerized in the presence of at least 0.1% of benzoin derivative reducing agent based on monomer weight in combination with a peroxide polymerization initiator.

Abstract: An aqueous coating composition comprising from 45 to 98 parts by weight (solids) of aqueous resin(s) and from 2 to 55 parts by weight (solids) of finely divided water-insoluble resin(s), in which at least a part of said aqueous resin is selected from amphoteric resins having both carboxyl and amino groups. The resins may have mutually reactive functional groups.

Abstract: Non-gelled compositions containing hydroxy ester copolymer having carboxyl groups and substantially free of oxirane groups are disclosed which are the esterification reaction product of(A) acidic addition copolymer; and(B) mixtures containing epoxy resin including both aromatic polyether containing oxirane groups and aromatic polyether devoid of oxirane groups, in which the mixture comprises at least 40% of the total resin solids and contains insufficient oxirane groups to react with all of the carboxyl groups in the copolymer. The resulting composition is neutralized with amine, is self-emulsifiable in water and is useful for coatings, e.g., for cans.

Abstract: An aqueous coating composition comprising from 45 to 98 parts by weight (solids) of aqueous resin(s) and from 2 to 55 parts by weight (solids) of finely divided water-insoluble resin(s), in which at least a part of said aqueous resin is selected from special type of cationic resins. The resins may have mutually reactive functional groups.

Abstract: Water-borne reaction products of (a) carboxyl-functional polymers; (b) polyepoxides; and (c) tertiary amines are blended with (d) carboxyl-functional polymers having an acid number dissimilar to that of (a). The resulting products are useful as film-forming components of coating compositions which can be spray-, flow-, dip-, roller-, or electro-coated and are especially useful for spray coating the inside of two-piece tin-plated steel cans of beverages and food. The coating compositions are useful as such or can be crosslinked with crosslinking agents such as a nitrogen resin.

Abstract: Polymeric coatings are provided on steel pipes to protect the same against corrosion. Monomers and prepolymers are permanently adhered to the surface of steel pipes by graft polymerization to form a barrier which keeps out moisture, oxygen and other corrosive gases from the steel substrate. The monomers and prepolymers are chosen to provide a low moisture vapor transmission rate and oxygen permeability.

Abstract: Aqueous dispersions of fluorocarbon polymers in combination with the water-borne reaction product of (a) carboxyl-functional polymers, (b) polyepoxides and (c) tertiary amines are provided. Such dispersions can be applied to a variety of substrates by either conventional coating techniques or electrodeposition, and provide coatings that exhibit excellent release properties and high lubricity.

Abstract: A durable antisoiling coating composition for textile filaments comprises a perfluoroalkyl ester of a citric acid urethane and fluorinated alcohols in combination with a modified epoxy resin which is the reaction product of a carboxyl-functional vinyl polymer, an epoxy resin and a tertiary amine. The composition can be applied as an aqueous dispersion, including a non-ionic textile lubricant based on poly(ethylene glycol).

Abstract: A coating composition comprises a water dilutable dispersion of (a) the reaction product of an epoxy resin with a primary or secondary amine and (b) a polymer containing free carboxyl groups. The epoxy resin and amine are preferably reacted in an organic solvent and a solution of the reaction product is mixed with a solution of the carboxyl-containing polymer (b) in an amount sufficient to provide an excess of free carboxyl groups over the amine groups in the epoxy resin reaction product (a). The coating composition is preferably applied to a substrate in the form of an aqueous dispersion in which (a) and (b) are held in stable dispersion by a base such as ammonia or an amine.

Abstract: Non-gelled compositions containing amine groups and substantially free of oxirane groups are disclosed which are the reaction product of(a) addition copolymer containing primary or secondary amino groups; and(b) a polyepoxide. The resulting composition is self-emulsifiable in water and is useful for coatings, particularly for metal.

Abstract: Amphoteric amino sulfonate derivatives of epoxy resins having at least one terminal group of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are hydrogen or methyl, R.sub.3 is hydrogen or C.sub.1 -C.sub.20 alkyl or substituted alkyl, and R.sub.4 is C.sub.1 -C.sub.6 alkylene or substituted alkylene, which are reaction products of an epoxy resin having a plurality of terminal groups of the formula: ##STR2## wherein R.sub.1 and R.sub.2 are as defined, with an amino sulfonate of the formula:R.sub.3 --NH--R.sub.4 --SO.sub.3 Mwherein R.sub.3 and R.sub.4 are as defined, and M is a cation.

Abstract: A laminating and coating adhesive based on an aqueous dispersion of(1) a copolymer of a vinyl ester, and/or an acrylic acid ester, and/or a further monomer and an ethylenically-unsaturated functional group-containing monomer having from 3 to 18 carbon atoms and hydroxy and carbonyl groups as functional groups, such as a monocarboxylic acid or dicarboxylic acid and/or N-methylol-(meth)-acrylamide,(2) an epoxy compound, and(3) an amine hardener.The adhesive gives a laminate bond with especially high resistance to peeling even in the case of thermal stress and/or in the presence of water.

Abstract: Aqueous dispersions of fluorocarbon polymers in combination with the water-borne reaction product of (a) carboxyl-functional polymers, (b) polyepoxides and (c) tertiary amines are provided. Such dispersions can be applied to a variety of substrates by either conventional coating techniques or electrodeposition, and provide coatings that exhibit excellent release properties and high lubricity.

Abstract: Aqueous emulsions and a process for producing aqueous emulsions useful in air drying and stoving paints with improved stability over long periods are described. Fatty acid esters carrying ether-like bound polyethyleneglycol radicals are reacted with conventional alkyd resin raw materials to provide an alkyd resin intermediate which is esterified with an acidic vinyl copolymer carrying methacrylic acid and oil fatty acid radicals. The excellent stability characteristics of the products, despite the relatively low content of polyglycol of from 3 to 8%, is believed due to the substantially unsaponifiable linkage of the stabilizing groups to the resin molecule.