申请人:Resolution Research Nederland B.V.
公开号:EP1283226A1
公开(公告)日:2003-02-12
Coating compositions which provide scratch resistant and acid resistant coating films, having a Tg in the range of from 1 to 70°C and which comprise a hydroxyl containing copolymer and a cross-linking agent, wherein the hydroxyl containing copolymer has a weight average molecular weight in the range of from 9000 to 30,0000, has an OH concentration of 3.5 to 5 wt% relative to the total weight of all comonomers, and has a Tg of from 0 to 35°C and is obtainable by free radical copolymerization of
(a) a glycidyl ester of an α-branched alkane carboxylic acid (a'), the acid moiety of which contains 9 to 13 carbon atoms, in an amount of from 0 to 40 wt% and preferably from 10 to 25 wt%, relative to the total mass of all comonomers and/or a vinyl ester of an α-branched alkane carboxylic acid (a''), the acid moiety of which contains 9 to 13 carbon atoms, in an amount of from 0 to 40 wt%, relative to the total mass of all components, wherein the total amount of (a') and (a'') is between 5 and 55wt% relative to the total mass of all components, and
(b) acrylic acid, which optionally is α-substituted by an alkyl group of from 1 to 3 carbon atoms, in an amount of from 0.7 to 12 wt%. relative to the total mass of all comonomers, and
(c) alkyl acrylate and optionally an alkyl methacrylate, the alkyl of which contains from 1 to 6 carbon atoms, and preferably from 1 to 4 carbon atoms, in a total amount of from 4 to 65 wt% (this, if c covers the amount of BA and MMA) relative to the total mass of all comonomers, and
(d) styrene, divinylbenzene, α-methylstyrene, vinylnaphtalene or alkyl substituted styrene, the alkyl of which contains from 1 or 2 carbon atoms, in an amount of from 15 to 30 wt%, relative to the total mass of all comonomers, and
(e) optionally a hydroxyalkyl acrylate and/or hydroxyalkyl methacrylate, wherein the alkyl residue contains from 1 to 4 carbon atoms, and preferably 2 carbon atoms, in an amount of from 5 to 38 wt% relative to the total mass of all comonomers,
and wherein the sum of the weight percentages of the amounts of components (a) - (e) is always 100%, and wherein the hydroxyl group concentration in the copolymer component is in the range of from 115.5 to 165 mg KOH/g copolymer,
and wherein the weight ratio between said hydroxyl containing copolymer and the cross-linking agent is in the range of from 90/10 to 60/40;
and cured coating films derived from said coating compositions.
可提供抗划伤和耐酸涂膜的涂料组合物,其 Tg 范围为 1 至 70°C,由含羟基共聚物和交联剂组成,其中含羟基共聚物的重量平均分子量范围为 9000 至 30000,相对于所有共聚物的总重量,其 OH 浓度为 3.5 至 5 wt%,Tg 为 0 至 35°C,可通过以下物质的自由基共聚得到
(a) α-支链烷烃羧酸(a')的缩水甘油酯,其酸基含有 9 至 13 个碳原子,相对于所有共聚单体的总重量为 0 至 40 wt%,最好为 10 至 25 wt%,和/或 α-支链烷烃羧酸(a'')的乙烯基酯、(a')和(a''')的总量相对于所有组分的总质量为 5 至 55wt%,其中(a')和(a''')的酸基含有 9 至 13 个碳原子;以及
(b) 丙烯酸,其任选被 1 至 3 个碳原子的烷基α 取代,相对于所有共聚单体的总 质量,其用量为 0.7 至 12 wt%,以及
(c) 丙烯酸烷基酯和可选的甲基丙烯酸烷基酯,其烷基含有 1 至 6 个碳原子,优选 1 至 4 个碳原子,相对于所有共聚单体的总重量为 4 至 65 wt%(如果 c 包括 BA 和 MMA 的用量),以及
(d) 苯乙烯、二乙烯基苯、α-甲基苯乙烯、乙烯基萘或烷基取代的苯乙烯,其中 烷基含有 1 或 2 个碳原子,相对于所有共聚单体的总质量,其用量为 15 至 30 wt%,以及
(e) 可选的丙烯酸羟烷基酯和/或甲基丙烯酸羟烷基酯,其中烷基残基含有 1 至 4 个碳原子,优选 2 个碳原子,相对于所有共聚单体的总重量为 5 至 38 wt%、
其中(a)-(e)组分的重量百分比之和始终为 100%,共聚物组分中羟基的浓度范围为 115.5 至 165 毫克 KOH/克共聚物、
所述含羟基共聚物与交联剂的重量比在 90/10 至 60/40 之间;
以及由所述涂料组合物制成的固化涂膜。