1-methyl imidazole catalyzed carboxyl terminated polyester

Details 1-methyl imidazole catalyzed carboxyl terminated polyester 1-methyl imidazole catalyzed carboxyl terminated polyester

1989-01-06

1990-03-20

Kight, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528296, 528297, 528302, 528308, 5283086, 528403, 525437, 524 92, 524 93, 4284228, 428458, 428480, C08G 6302

Patent

active

049102877

ABSTRACT:
The present disclosure is concerned with catalyzing the reactivity of carboxyl group bearing polyesters such as terephthalic acid, isophthalic acid, neophentyl glycol based polyesters which are suitable for use in powder coating formulations with epoxide compounds. An enhanced uniformity of catalysis is obtained without a degradation of color by adding 1-methyl imidazole to a liquid melt of the polyester. In a preferred embodiment between 0.03 and 0.3 weight percent of the 1-methyl imidazole is added to a molten polyester which has an acid number between 10 and 100, a 200.degree. C. I.C.I. cone and plate viscosity between 20 and 70 Poise, and a DSC determined glass transition temperature of at least about 40.degree. C. when the polyester is at a sufficiently elevated temperature to have I.C.I. plate and cone viscosity of less than about 70 Poise. A particularly advantageous powder coating composition results when such a polyester is combined with an at least difunctional epoxy compound such as triglycidyl isocyanurate (TGIC) at an epoxy to carboxyl ratio of between about 0.9 to 1.4 extrusion mixing.

REFERENCES:
patent: Re32029 (1985-11-01), Pesata, Jr. et al.
patent: 4147737 (1979-04-01), Sein et al.
patent: 4223097 (1980-09-01), Johannes et al.
patent: 4356285 (1982-10-01), Kumagai
patent: 4370452 (1983-01-01), Heater
patent: 4804581 (1989-02-01), Geary et al.

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