Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1981-01-12
1983-01-25
Griffin, Ronald W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
524904, 525533, 525934, 528112, 528296, 528297, C08L 6300, C08L 6702
Patent
active
043704522
ABSTRACT:
A copolyester resin having modified carboxyl terminated ends is disclosed, as well as the method for making and using that compound with epoxide curing compounds in powder coating resins for substrates. The polymerization of the copolyester resin contains a reactor compounding stage which permits the reaction of the carboxyl termini with a curing reaction catalyst prior to any compounding or mixing of the modified copolyester resin with the epoxide curing compounds. The modification to these end groups of the copolyester resin creates activated termini which, although stable of themselves, react more rapidly, when the modified copolyester resin is compounded with the epoxide curing compounds and subsequently heated on the substrate, than with the conventional introduction of the epoxide catalyst during final compounding. Alteration of the curing parameters of the modified copolyester resin with the epoxide curing compounds imparts greater impact strength and better leveling properties at temperatures between 300.degree. F. and 450.degree. F.
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Griffin Ronald W.
Hendricks Bruce
Hudak D. J.
The Goodyear Tire & Rubber Company
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