申请人:FORD MOTOR COMPANY LIMITED
公开号:EP0086308A1
公开(公告)日:1983-08-24
A novel polyhydroxy oligomer crosslinkable with aminoplast resins to form a coating composition adapted for use as an automotive topcoat which upon curing forms a hard, glossy, durable coating with outstanding durability and excellent resistance to solvents and water. The coating composition comprises:
(A) a polyhydroxy oligomer having a number average (Mn) molecular weight of between about 250-2000 and being the reaction produce of:
(i) an ester having pendant hydroxyl and carboxyl functionality and being made by reacting
(a) a C3-Clo aliphatic branched diol, and
(b) an alkyl hexahydrophthalic anhydride, wherein (a) and (b) are combined in the reactant mixture in an amount sufficient to allow reaction in at least about a 1:1 molar ratio; and
(ii) a C2-C10 monomer, having reactive functionality capable of esterifying said carboxyl functionalilty of said ester, said C2-C10 monomer being selected from the group consisting of:
(a) a monomer wherein said reactive functionality reacts with said carboxyl functionality to form an hydroxy in addition to an ester linkage;
(b) a monomer bearing hydroxyl functionality in addition to said reactive functionality and wherein said reactive functionality does not generate an hydroxy in addition to an ester linkage; and
(c) a monomer bearing hydroxyl functionality in addition to said reactive functionality wherein said reactive functionality reacts with said carboxyl functionality to form a hydroxyl in addition to an ester linkage, wherein said ester and said C.-C1o monomer are combined in the reactant mixture in an amount sufficient to allow reaction in about a 1:1 molar ratio;
(B) an amine-aldehyde or polyisocyanate crosslinking agent; and
(C) 0-50 weight percent based on the total weight of (A),
(B) and (C) of hydroxy functional additive having a number average molecular weight (Mn) of between about 150-6000,
In addition, the coating composition of this invention may include conventional additives such as catalysts, antioxidants, U.V. absorbers, flow control or wetting agents, antistatic agents, pigments, plasticiers, solvents, etc. The oligomers of this composition are also compatible with non- agueous dispersions (NAD's).
一种可与氨基树脂交联的新型聚羟基低聚物,可形成一种用作汽车面漆的涂料组合物,固化后可形成坚硬、有光泽、耐用的涂层,具有出色的耐久性和优异的耐溶剂和耐水性。该涂料组合物包括
(A) 聚羟基低聚物,其平均(Mn)分子量在 250-2000 之间,是下列物质的反应产物: (B) 聚羟基低聚物,其平均(Mn)分子量在 250-2000 之间:
(i) 具有羟基和羧基官能团的酯,由以下物质反应生成
(a) C3-Clo 脂肪族支链二元醇,和
(b) 烷基六氢邻苯二甲酸酐,其中(a)和(b)在反应物混合物中的结合量足以使反应至少以大约 1:1 的摩尔比进行;以及
(ii) C2-C10 单体,具有可将所述酯的羧基官能团酯化的反应性官能团,所述 C2-C10 单体选自以下组成的组:
(a) 单体,其中所述活性官能团与所述羧基官能团反应,除形成酯连接外,还形成羟基;
(b) 除所述反应性官能团外还含有羟基官能团的单体,其中所述反应性官能团除 酯键外不产生羟基;及
(c) 除所述反应性官能团外还含有羟基官能团的单体,其中所述反应性官能团与所述羧基官能团反应以形成除酯连接外的羟基,其中所述酯和所述 C.-C1o 单体在反应物混合物中的结合量足以使反应以约 1:1 的摩尔比进行;
(B) 一种胺-醛或多异氰酸酯交联剂;以及
(C) 以(A)、(B)和(C)的总重量为基准,0-50%、
(B)和(C)总重量的 0-50%的羟基官能团添加剂,其平均分子量(Mn)约为 150-6000、
此外,本发明的涂料组合物还可包括常规添加剂,如催化剂、抗氧化剂、紫外线吸收剂、流动控制剂或润湿剂、抗静电剂、颜料、增塑剂、溶剂等。本组合物的低聚物还可与非琼脂分散体(NAD)相容。