申请人:Clariant GmbH
公开号:US20030171466A1
公开(公告)日:2003-09-11
The invention relates to a process of preparing glycol carboxyethylmethylphosphinate, which comprises
a) reacting elemental yellow phosphorus with methyl chloride in the presence of an alkali or alkaline earth metal hydroxide to form a mixture which includes the alkali and/or alkaline earth metal salts of methylphosphonous, phosphorous and hypophosphorous acids as main constituents,
b) esterifying the methylphosphonous acid from the mixture obtained by a),
c) removing the methylphosphonous ester from the mixture,
d) adding the thus obtained methylphosphonous ester to an acrylic ester,
e) hydrolyzing the diester thus obtained,
f) esterifying the resulting carboxyethylmethylphosphinic acid with ethylene glycol directly to the glycol carboxyethylmethylphosphinate.
The invention also relates to the use of the glycol carboxyethylmethylphosphinates prepared according to the invention as reactive flame retardants for polymers.
本发明涉及一种制备乙二醇羧基乙基甲基膦酸盐的方法,包括以下步骤:
a) 在碱金属或碱土金属氢氧化物的存在下,将元素黄磷与氯甲烷反应,形成包括甲基亚磷酸、亚磷酸和次亚磷酸的碱金属和/或碱土金属盐的混合物;
b) 酯化步骤a)中所得混合物中的甲基亚磷酸;
c) 从混合物中去除甲基亚磷酸酯;
d) 将所得的甲基亚磷酸酯加入丙烯酸酯中;
e) 水解所得的二酯;
f) 将得到的羧基乙基甲基膦酸与乙二醇直接酯化为乙二醇羧基乙基甲基膦酸盐。
本发明还涉及根据本发明所述方法制备的乙二醇羧基乙基甲基膦酸盐作为聚合物的反应性阻燃剂的用途。