Low gloss powder coating composition and method for coating ther

Details Low gloss powder coating composition and method for coating ther Low gloss powder coating composition and method for coating ther

1994-09-07

1996-02-13

Acquah, Samuel A.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525440, 525441, 525443, 525444, 528 45, 528 80, 528 83, 528 86, 528129, C08F 2000

Patent

active

054912024

ABSTRACT:
A powder coating composition for forming a low gloss coating film based on thermosetting polyester resins exhibiting only a little fluctuation of the resultant low gloss value even if an unequality in the mixing proportion of components or in the baking condition exists, comprising three thermosetting polyester resins (A), (B) and (C) and a hardener (D), wherein the weight ratio of the polyester resin (A) to the polyester resin (B) is in the range of 90/10-70/30 and that of the polyester resin (A) to the polyester resin (C) is in the range of 85/15-60/40 and the equivalent ratio of the polyester resin (A, B or C) to the hardener (D) is each in the range of 0.8 to 1.25 and wherein the polyester resins (A), (B) and (C) are selected from those in which the moduli of elasticity E.sub.a, E.sub.b and E.sub.c for the products of the curing reaction of these resins with the hardener (D), respectively, after 3 minutes' curing with the hardener (D) at 200.degree. C. hold a relatioship that the differences between the moduli of elasticity E.sub.b-a =E.sub.b -E.sub.a and E.sub.c-a =E.sub.c -E.sub.a are maintained in the following ranges, respectively:
20 dyn/cm.sup.2 <E.sub.b-a <10.sup.3 dun/cm.sup.2 and
1 dyn/cm.sup.2 <E.sub.c-a <10 dyn/cm.sup.2

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