HEAT-CURABLE PULVERULENT COATING COMPOSITION OF A MIXTURE OF A COPOLYMER CONTAINING GLYCIDYL GROUPS AND AN ADDUCT OF ALIPHATIC DICARBOXYLIC ACID AND 2,4,6-TRIS(N',N,N'-DIMETHYLAMINOMETHYL)-PHENOL

摘要

1487430 Powder coating composition HOECHST AG 18 Feb 1975 [22 Feb 1974] 6771/75 Heading C3B A powder coating composition comprises a mixture of (A) 80-96% by wt. of copolymers prepared from (i) 6-24% by wt. of epoxide monomers of formula in which R 1 and R 2 are H or CH 3 ; R3 is a direct bond, -COOCH 2 -, -CH 2 OCH 2 -, (ii) 4-20% by weight of hydroxyalkyl esters of (meth)acrylic acid (C 2-4 hydroxyalkyl), (iii) 10-80% by weight of (meth)acrylic esters of C 1-8 aliphatic saturated monohydric alcohols, and (iv) 10-60% by wt. of styrene or vinyl toluene; (B) 4-20% by wt. of an adduct of and acid HOOC(CH 2 ) n COOH (n=4-11) and 2,4,6, tris(N,N11,N111 - dimethylaminomethyl)phenol in a weight ratio of 97 : 3 to 99 : 1. There may additionally be present a flow control agent which is a polymer of M.W. (M n ) at least 1000 having a glass transition temperature at least 50‹ C. lower than that of the copolymer (A), e.g. polybutyl acrylate. An example of (A) is prepared from (by wt.): (i) 12-16% glycidyl methacrylate, (ii) 14-18% hydroxyethyl methacrylate, (iii) 15-25% n-butyl acrylate and 5- 35% methyl methacrylate and (iv) 20-50% styrene. (B) may be an adducts of 97À8 parts by wt. decane-1,10-dicarboxylic acid and 2À2 parts by wt. 2,4,6-tris(N1,N11,N111-dimethylaminomethyl)phenol. The powder coating composition may be prepared by grinding the components to 100-300 Ám., fusing at 95-110‹ C. whilst mixing or kneading and, after solidification, grinding to 5-120 Ám.