专利内容由知识产权出版社提供
专利名称：Acrylate/maleate copolymers, their
preparation and use as antiscalants
发明人：Walinsky, Stanley Walter申请号：EP82300606申请日：19820208公开号：EP0058073A3公开日：19820908
摘要：Substantially homogeneous acrylate/maleate copolymers of number averagemolecular weight of 500 to 5000 are prepared by copolymerizing 35 to 65 mole percentacrylic or methacrylic acid (or a mixture thereof) with 65 to 35 mole percent maleicanhydride at over a period of from 0.3 to 10 hours at 80 to 150°C in the presence ofspecified quantities of a polymerization initiator and a chain-transfer solvent, the solventand mode of addition of the monomers to the solvent being such that both themonomers and the formed co-polymer remain in solution and the mole ratio of theacrylic or methacrylic acid monomer to the maleic anhydride monomer in the solvent ismaintained at from 0.005 to 0.2 throughout the polymerization. Also included aresubstantially homogeneous copolymers consisting essentially of from 35 to 65 molepercent acrylic or methacrylic acid units (or a mixture thereof) and from 65 to 35 molepercent maleic anhydride units and having a number average molecular weight of from500 to 5000. The copolymers in hydrolyzed form are particularly useful in the preventionof alkaline calcium and magnesium scale formation, such as during sea-water evaporativedesalination.
申请人：PFIZER INC.
更多信息请下载全文后查看
