申请人:FORD MOTOR COMPANY LIMITED
公开号:EP0027719A1
公开(公告)日:1981-04-29
A thermosetting coating composition which may have nonvolatile solids content as high as 60%or greater and which may be employed as an automotive topcoat. The composition, exclusive of pigments, solvent, reactive and non-reactive diluents and other non-reactive components, consists essentially of:
(A) A binder composition consisting essentially of: (1) Between about 30 and about 75 weight percent of one or more low viscosity resins selected from hydroxy functional acrylic polymers, hydroxy functional polyethers and hydroxy functional polyesters, each of which (i) is substantially soluble in the solvent of the composition and (ii) has a number average molecular weight of between about 1000 and about 2500; and (2) Between about 70 and about 25 weight percent of one or more crosslinked dispersion polymers each of which is substantially insoluble in the solvent of the composition; and
(B) An amino crosslinking agent in an amount of between about 5 and about 40 parts per 100 parts of said binder composition. The crosslinked dispersion polymer is prepared by free radical polymerization of 0.5 to 3.5 weight percent of di-,tri- or tetravinyl monomers and 99.5 to 96.5 weight percent of at least one other copolymerizable monoethylenically unsaturated monomer, in the present of a (i) hydrocarbon dispersing liquid which is a solvent for the polymerizable monomer, but a non-solvent for the resulting crosslinked polymer, and (ii) polymeric dispersion stabilizer which is solvated by said dispersing liquid and associated with said crosslinked polymer so as to maintain a separation between particles thereof, thereby inhibiting coagulation of said particles, wherein polymerization is carried out at elevated temperature such that the dispersion polymer first forms and then is crosslinked.
一种热固性涂料组合物,其非挥发性固体含量可高达 60% 或更高,可用作汽车面漆。该组合物不含颜料、溶剂、活性和非活性稀释剂以及其他非活性成分,主要由以下成分组成:
(A) 粘结剂组合物,主要包括:(1) 约 30%至约 75%的一种或多种低粘度树脂,这些树脂选自羟基官能丙烯酸聚合物、羟基官能聚醚和羟基官能聚酯,其中每种树脂 (i) 基本上可溶于组合物的溶剂,(ii) 平均分子量在约 1000 至约 2500 之间;(2) 约 70%至约 25%的一种或多种交联分散聚合物,其中每种聚合物基本上不溶于组合物的溶剂;以及
(B) 氨基交联剂,其用量为每 100 份所述粘结剂组合物中约 5 至约 40 份。交联分散聚合物是通过自由基聚合 0.5 至 3.5 重量百分比的二乙烯基、三乙烯基或四乙烯基单体和 99.5 至 96.5 重量百分比的至少另一种可共聚的单乙烯基不饱和单体,在(i) 烃类分散液(可聚合单体的溶剂,但不是所得交联聚合物的溶剂)和(ii) 聚合物分散液(可聚合单体的溶剂,但不是所得交联聚合物的溶剂)的存在下制备、和 (ii) 聚合物分散稳定剂,它被所述分散液溶解,并与所述交联聚合物结合,以保持其颗粒之间的分离,从而抑制所述颗粒的凝结,其中聚合反应在高温下进行,使分散聚合物首先形成,然后交联。