Process for the preparation of water-soluble polymers containing polyalkylene glycol ether side chains
    29.
    发明授权
    Process for the preparation of water-soluble polymers containing polyalkylene glycol ether side chains 失效
    制备含聚亚烷基二醇醚侧链的水溶性聚合物的方法

    公开(公告)号:US06756471B1

    公开(公告)日:2004-06-29

    申请号:US10129110

    申请日:2002-05-13

    IPC分类号: C08G6300

    摘要: The invention relates to a process for the preparation of water-soluble polymers containing polyalkylene glycol ether side chains and having molecular weights of from 15,000 to 65,000 by solution polymerization of esters of ethylenically unsaturated carboxylic acids and polyalkylene glycols which are masked on the end groups at one end, if desired together with another monomer in at least one hydrocarbon at monomer concentrations of from 70 to 95% by weight in the presence of free-radical-forming polymerization initiators and, if desired, polymerization regulators at temperatures of up to 200° C., removal of the solvent used in the solution polymerization, and dissolution of the polymers in water to give from 50 to 80% strength by weight solutions, with polymers containing acid groups being neutralized if desired.

    摘要翻译: 本发明涉及一种制备含聚亚烷基二醇醚侧链的水溶性聚合物的方法,其分子量为15,000至65,000,通过在末端基上被掩蔽的烯属不饱和羧酸和聚亚烷基二醇的酯的溶液聚合 一方面,如果需要,在形成自由基的聚合引发剂的存在下,在70至95重量%的单体浓度下,在至少一种烃中与另一种单体一起使用,如果需要,聚合调节剂的温度高达200° C.去除溶液聚合中使用的溶剂,并将聚合物溶解在水中,得到50-80%重量的强度溶液,如果需要,含有酸基团的聚合物被中和。

    Process for preparing D,L-aspartic acid from ammonium salts of the
maleic acid
    30.
    发明授权
    Process for preparing D,L-aspartic acid from ammonium salts of the maleic acid 失效
    从马来酸的铵盐制备D,L-天冬氨酸的方法

    公开(公告)号:US5756839A

    公开(公告)日:1998-05-26

    申请号:US809141

    申请日:1997-03-24

    CPC分类号: C07C227/06 C07C229/24

    摘要: A process is disclosed for preparing D,L-aspartic acid by beating aqueous solutions of ammonium salts of the maleic acid. The molar ratio of maleic acid to ammonia ranges from 1:1 to 1:50. The process is carried out at temperatures from 60.degree. to 250.degree. C. and pressures of at least 1 bar. The pressure applied during the reaction is adjusted to ensure that the reaction mixture is almost completely present in liquid phase. Excess ammonia is removed and the reaction solution is acidified so as to release D,L-aspartic acid, which is then isolated.

    摘要翻译: PCT No.PCT / EP95 / 03600 Sec。 371日期1997年3月24日 102(e)1997年3月24日PCT PCT 1995年9月13日PCT公布。 出版物WO96 / 09277 日期:1996年3月28日公开了通过马来酸的铵盐的打浆水溶液制备D,L-天冬氨酸的方法。 马来酸与氨的摩尔比为1:1至1:50。 该方法在60℃至250℃的温度和至少1巴的压力下进行。 调节反应期间施加的压力以确保反应混合物几乎完全存在于液相中。 除去过量的氨,并将反应溶液酸化,以释放分离的D,L-天冬氨酸。