The invention provides a hydroxyl-containing polymer characterised in that it is prepared by heating in the presence of a free radical initiator and optionally a chain transfer agent, the following reactive ingredients:
(A) a polymerizable alpha, beta-ethylenically unsaturated carboxylic acid and
(B) an epoxy compound containing at least 5 carbon atoms which is not polymerizable with (A);
(A) and (B) amounting to at least 80 percent by weight of the reactive ingredients and the equivalent ratio of acid in (A) to epoxy in (B) is at least 1:1.
The invention also includes a curable coating composition comprising such a hydroxyl-containing polymer and a curing agent which is reactive with the hydroxyl groups in said hydroxyl-containing polymer, the curing agent being present in an amount sufficient to form a cured product.
本发明提供了一种含羟基的聚合物,其特征在于它是在自由基
引发剂和链转移剂的存在下,通过加热以下反应成分制备而成的:
(A) 可聚合的 α、β-
乙烯基不饱和
羧酸和
(B) 至少含 5 个碳原子的环氧化合物,该环氧化合物不能与(A)聚合;
按重量计,(A)和(B)至少占反应性成分的 80%,且(A)中酸与(B)中环氧的当量比至少为 1:1。
本发明还包括一种可固化涂料组合物,该组合物包含这样一种含羟基聚合物和一种与所述含羟基聚合物中的羟基反应的固化剂,固化剂的存在量足以形成固化产品。