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US 4,153,586 AGranted
Process of making epoxy resins modified with mercaptocarboxylates
AssigneePPG Industries, Inc.
InventorsThomas R. Hockswender, Marvis E. Hartman
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AssigneePPG Industries, Inc.
InventorsThomas R. Hockswender, Marvis E. Hartman
Estimating the term…
A process of making modified epoxy resins wherein a polyepoxide resin is reacted with a mercaptan compound of the formula HS--R--(COOX).sub.m wherein R is an organic radical having from 1 to 10 carbon atoms, X is hydrogen or a moiety formed by reacting the carboxyl group with a basic compound to form its salt and m is an integer of from 1 to 5. The compounds are reacted in the presence of a tin catalyst to produce resins of the structure B [--S--R--(COOX).sub.m ].sub.n wherein B is the residue from the ring opening reaction of an epoxide group on the polyepoxide resin molecule and the sulfhydryl hydrogen, R, X and m are as defined previously and n is at least 1. The aforementioned resins are produced without the need of a hydrolysis step. The modified epoxy resins are useful in formulating coating compositions having excellent physical and chemical properties. The resins can be dissolved or dispersed in water to form aqueous coating compositions.
A process of making modified epoxy resins comprising reacting a polyepoxide having a 1,2-epoxy equivalency of greater than 1.0 with a mercaptan compound having the structure HS--R--(COOX).sub.m, wherein R is an organic radical having from 1 to 10 carbon atoms, X is hydrogen or a moiety formed by reacting the carboxylic acid with a basic compound to form its salt and m is an integer of from 1 to 5 wherein the equivalent ratio of epoxy groups in the polyepoxide to mercaptan groups is from about 1.0:0.25 to about 1.0:1.25, said process occurring in the presence of a tin catalyst so as to produce the modified epoxy resins resulting from the ring opening reaction of an epoxide group on the polyepoxide molecule and the sulfhydryl hydrogen.
A process of making modified epoxy resins comprising reacting a polyepoxide having a 1,2-epoxy equivalency of greater than 1.0 with a mercaptan compound having the structure HS--R--(COOX).sub.m wherein R is an organic radical having from 1 to 3 carbon atoms, X is hydrogen or a moiety formed by reacting the carboxylic group with a basic compound selected from the group consisting of alkali metal hydroxide and alkoxide, ammonia, amine, quaternary ammonium and mixtures thereof and m is an integer of from 1 to 5 in the presence of from about 0.1 percent to about 5 percent of a tin catalyst selected from the group consisting of dibutyl tin dilaurate, stannous octoate and mixtures thereof, and wherein the equivalent ratio of epoxy groups to mercaptan groups is from about 1.0:0.25 to about 1.0:1.25.
Dependencies are inferred from the claim text.