公开(公告)号：US06433114B1

公开(公告)日：2002-08-13

申请号：US09886339

申请日：2001-06-19

申请人： Mitsuo Kinoshita ,  Tetsuaki Sugita

发明人： Mitsuo Kinoshita ,  Tetsuaki Sugita

IPC分类号： C08F23004

CPC分类号： C04B24/165 ,  C04B24/2647 ,  C04B2103/408 ,  C08F20/28

摘要： Polyetherester monomers of a high quality are produced by causing an esterification reaction of polyalkyleneglycol with a closed end of a specified kind which has been refined so as to contain residual free acid by less than 0.03 weight %, as converted to acetic acid, and unsaturated carboxylic acid of another specified kind by using a specified amount of an acid catalyst under a heated and reduced-pressure condition in the absence of solvents and in the presence of p-benzoquinone and/or phenothiazine while distilling away generated water. Cement dispersants are produced by using water-soluble vinyl copolymers obtained by a radical copolymerization reaction between such polyetherester monomers and vinyl monomers.

摘要翻译： 高品质的聚醚酯单体通过使已经精制而成的具有特定类型的封端的聚亚烷基二醇的酯化反应产生，从而将残留的游离酸含量转化为少于0.03％（重量）的乙酸，而不饱和羧酸 酸，在不存在溶剂和在对苯醌和/或吩噻嗪的存在下，在加热和减压条件下使用指定量的酸催化剂，同时蒸馏出生成的水。 通过使用通过这种聚醚酯单体和乙烯基单体之间的自由基共聚反应获得的水溶性乙烯基共聚物来生产水泥分散剂。