申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0129977A2
公开(公告)日:1985-01-02
Polymer-modified polyols of reduced viscosity are made by reacting an organic polyisocyanate with a low molecular weight hydroxyl-containing compound in a polyol in the presence of a specified dispersant. The dispersant, which is of a type known for dispersing pigments in paints is obtained by reacting
(1) a copolymer comprising units derived from the following ethylenically unsaturated monomers in the stated proportions by weight based on the total weight of the
copolymer:
(a) 0-50% of a hydroxy group-containing monomer, and/or
(b) 0-20% of an amide group-containing monomer, provided that there is always present at least 5% of (a) and (b);
(c) 20-80% of a monomer free from carboxyl groups and containing a straight or branched chain alkyl group of from 7 to 22 carbon atoms, and
(d) 0-50% of one or more monomers free from the hydroxy, amide and C7-22 alkyl groups present in (a), (b) or (c), and also, as an essential constituent.
(e) up to 20% of a monomer containing an epoxide group, the total of monomers (a), (b). (c). (d) and (e) being 100%.
with
(2) a compound bearing a carboxyl group and a group having pigment dispersant characteristics.
Preferably it is a copolymer of styrene; 2-ethyl hexyl acrylate; hydroxy isopropylmethacrylate; methacrylamide; glycidyl methacrylate in the ratios 26:40:25:5:4, modified by esterification with p-aminobenzoic acid in the presence of dimethyl dodecyl tertiary amine.
The modified polyols of particular interest are those used in the manufacture of flexible foam slabstock.
粘度降低的聚合物改性多元醇是通过有机多异氰酸酯与多元醇中的低分子量含羟基化合物在特定分散剂的存在下发生反应而制成的。分散剂是一种已知的用于分散油漆中颜料的分散剂,通过以下反应获得
(1) 由下列乙烯基不饱和单体按所述重量比例(以共聚物总重量为基准)衍生出的单 位组成的共聚物
共聚物:
(a) 0-50% 的含羟基单体,和/或
(b) 0-20%的含酰胺基单体,条件是(a)和(b)中始终至少含有 5%;
(c) 20-80%不含羧基且含有 7 至 22 个碳原子的直链或支链烷基的单体,以及
(d) 0-50%不含(a)、(b)或(c)中的羟基、酰胺基和 C7-22 烷基的一种或多种单体,也是一种基本成分。
(e) 含有环氧基的单体不超过 20%,单体(a)、(b)、(c)的总和。(c).(d) 和 (e) 的总和为 100%。
与
(2) 含有羧基和具有颜料分散剂特性的基团的化合物。
最好是苯乙烯、丙烯酸 2-乙基己酯、甲基丙烯酸羟异丙酯、甲基丙烯酰胺、甲基丙烯酸缩水甘油酯的共聚物,其比例为 26:40:25:5:4,在二甲基十二烷基叔胺存在下,用对氨基苯甲酸进行酯化改性。
特别令人感兴趣的改性多元醇是用于制造软质泡沫塑料片材的多元醇。