申请人:DAINIPPON INK AND CHEMICALS, INC.
公开号:EP0238013A1
公开(公告)日:1987-09-23
A paint resin composition which does not appreciably attack an old coated film or a substrate to be coated, said composition consisting essentially of
(A) a copolymer having a glass transition point of from -30°C to +50°C, a number average molecular weight of from 4,000 to 20,000 and a weight average molecular weight/ number average molecular weight ratio of from 1.8 to 10 and obtained by copolymerizing (a-1) 1 to 50% by weight of a vinyl monomer having a hydroxyl group, (a-2) 0 to 5% by weight of a vinyl monomer having a carboxyl group, (a-3) 0 to 80% by weight of a polyester resin having a copolymerizable unsaturated bond, (a-4) 10 to 80% by weight of a vinyl monomer having a side-chain alkyl group with 4 to 8 carbon atoms, and (a-5) 4 to 49% by weight of another vinyl monomer copolymerizable with the monomers (a-1) to (a-4), the total proportion of these monomers being 100% by weight, in the presence of a radical initiator in a nonpolar organic solvent having an aniline point of 7 to 70°C,
(B) a polyisocyanate containing an isocyanurate ring and being soluble in a nonpolar organic solvent having an aniline point to from 7 to 70°C, said polyisocyante being obtained by reacting at least one diisocyanate compound selected from alkylene diisocyanates having 2 to 8 carbon atoms in the alkylene moiety, cyclo-alkylene diisocyanates having 6 to 8 carbon atoms in the cycloalkylene moiety and aralkylene diisocyantes having 7 to 8 carbon atoms in the aralkylene moiety with a diol having 10 to 40 carbon atoms, and
(C) a nonpolar organic solvent, the OHINCO equivalent ratio of the copolymer (A) to the polyisocyanate (B) being from 1:0.2 to 1:1.5.
一种不会明显侵蚀旧涂膜或待涂基材的涂料树脂组合物,所述组合物主要包括
(A) 一种共聚物,其玻璃化转变点为-30°C 至 +50°C,平均分子量为 4000 至 20000,平均分子量/平均分子量比为 1.(a-1) 1 至 50%(重量百分比)具有羟基的乙烯基单体;(a-2) 0 至 5%(重量百分比)具有羧基的乙烯基单体;(a-3) 0 至 80%(重量百分比)具有可共聚不饱和键的聚酯树脂;(a-4) 10 至 80%(重量百分比)具有 4 至 8 个碳原子的侧链烷基的乙烯基单体、(a-5)4-49%(按重量计)可与单体(a-1)至(a-4)共聚的另一种乙烯基单体,这些单体的总比例为 100%(按重量计),在有自由基引发剂存在的情况下,在苯胺点为 7 至 70℃的非极性有机溶剂中进行、
(B) 包含异氰尿酸酯环并可溶于苯胺点为 7 至 70°C 的非极性有机溶剂中的多异氰酸酯,所述多异氰酸酯由至少一种二异氰酸酯化合物反应获得,所述二异氰酸酯化合物选自烷基中含有 2 至 8 个碳原子的亚烷基二异氰酸酯、环亚烷基中含有 6 至 8 个碳原子的环亚烷基二异氰酸酯和芳基中含有 7 至 8 个碳原子的芳基二异氰酸酯与含有 10 至 40 个碳原子的二元醇反应得到的二异氰酸酯化合物,以及
(C) 非极性有机溶剂,共聚物 (A) 与多异氰酸酯 (B) 的 OHINCO 当量比为 1:0.2 至 1:1.5。