Polymerisation process for preparation of non-aqueous dispersions of microparticles and coating compositions containing said microparticles
申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0030439A2
公开(公告)日:1981-06-17
A process is described for making sterically stabilised non-aqueous dispersions of composite polymer microparticles, in which (1) monomers including at least one crosslinking monomer are polymerised in an aqueous medium at a temperature at least 10° higher than the glass transition temperature of the polymer to be formed, in the presence of a block or graft copolymer stabilising agent, under conditions such that there is at no time present a separate monomer phase, (2) further monomers, not including any crosslinking monomer, are polymerised in the dispersion thus obtained, the presence of a separate monomer phase again being avoided, and (3) the microparticles are transferred from the resulting dispersion into a non-aqueous medium which is a solvent for the non-cross- linked polymer generated in (2). The microparticles are of value for incorporation into coating compositions the main film-forming constituent of which is compatible with the non-cross- linked component of the particles.
本发明描述了一种制造立体稳定的复合聚合物微粒非水分散体的工艺,其中 (1) 包括至少一种交联单体在内的单体在水介质中聚合,聚合温度至少比要形成的聚合物的玻璃化转变温度高 10°,并有嵌段或接枝共聚物稳定剂存在、(2) 进一步的单体(不包括任何交联单体)在得到的分散体中聚合,再次避免出现单独的单体相; (3) 将微颗粒从得到的分散体中转移到非水介质中,该介质是在 (2) 中生成的非交联聚合物的溶剂。这种微粒可用于加入涂层组合物中,其主要成膜成分与微粒中的非交联成分相容。