Method of producing powdery coating material

Details Method of producing powdery coating material Method of producing powdery coating material

2005-08-23

2005-08-23

Cheung, William K. (Department: 1713)

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

Synthetic resins

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

C525S295000, C525S327200, C525S374000, C525S375000, C525S379000, C525S382000, C525S386000

Reexamination Certificate

active

06933348

ABSTRACT:
Disclosed is a method of producing a powdery coating material by using a curable acrylic resin (A) having a number average molecular weight of from 2,000 to 20,000 and a glass transition temperature of from 30 to 90° C. obtained by polymerizing a starting monomer containing from 15 to 50 mol % of an unsaturated compound which contains at least a glycidyl group and/or a methylglycidyl group, and from 20 to 50 mol % of methyl methacrylate; a curing agent (B) capable of being reacted with the glycidyl group or the methylglycidyl group constituting the curable acrylic resin (A); and an alcohol solvent (C) having a boiling point under normal pressure of from 70 to 120° C.; said method comprising a kneading step of so kneading the curable acrylic resin (A), the curing agent (B) and the alcohol solvent (C) that at least the curing agent (B) is dissolved in the alcohol solvent (C) at a temperature of not higher than 130°C., and a vapor-removing step of continuously vapor-removing the alcohol solvent (C) under a reduced pressure at a temperature of not higher than 130° C.

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