Patent ID: 6491986
Filing Date: 2002-12-10
Classification: C08G,Y10S

Abstract:
A transparent or pigmented powder coating material containing crosslinking agents comprising hydroxyalkylamides and polyisocyanates containing uretdione groups, comprising:A) from 20 to 99% by weight of at least one acidic polymer; B) from 1 to 25% by weight of at least one &bgr;-hydroxyalkylamide; C) from 0.05 to 10% by weight of at least one nonaromatic polyisocyanate which contains uretdione groups and has an NCO functionality &gE;1; D) from 0 to 50% by weight of at least one pigment and/or inorganic filler; E) from 0 to 5% by weight of at least one adjuvant or auxiliary, wherein said acidic polymer A) is (1) at least one polyester resin having a glass transition temperature in the range from 30 to 85Â° C. and an acid number ranging from 20 to 80 mg KOH/g , or (2) at least one acrylate resin having an acid number in the range from 10 to 250 mg KOH/g and a melting point ranging from 60 to 160Â° C., or a mixture of (1) and (2), andwherein the nonaromatic polyisocyanate containing uretdione groups, C) comprises polyols as chain extenders.