申请人:S.C. JOHNSON & SON, INC.
公开号:EP0321913A2
公开(公告)日:1989-06-28
The present invention provides for a process for producing an alkali-soluble graft polymer having at least one main chain and a plurality of side chains attached thereto, the process comprising the steps of:
combining, in a solvent contained within an agitated reaction zone, (1) at least one vinylic monomer that is capable of forming free radicals, (2) at ;east pme ethylenically-unsaturated carboxylic acid monomer that is capable of addition-copolymerizing with the vinylic monomer in the presence of the thus-formed free radicals, and (3) cyclic ester molecules that are capable of ring-opening in the presence of the carboxylic acid monomer, thereby producing a reactant-initiatable polymerizable mixture; and
subjecting the reactant-initiatable polymerizable mixture to a preselected temperature and pressure effective to cause the vinylic monomer and the ethylenically-unsaturated carboxylic acid monomer to free-radically addition-copolymerize to form the graft polymer one main chain and to cause the cyclic ester molecules to ring-open at the inner ester bonds thereof and to graft onto the polymer main chain, thereby forming the side chains of the graft polymer,
the process being characterized in that the main-chain and side-chain formations of the graft polymer occur substantially simultaneously.
The present invention also provides for graft polymer produced in accordance with the inventive process.
本发明提供了一种生产碱溶性接枝聚合物的工艺,该聚合物具有至少一条主链和连接在其上的多条侧链,该工艺包括以下步骤:
在搅拌反应区内的溶剂中,将(1)至少一种能形成自由基的乙烯基单体,(2)能在由此形成的自由基存在下与乙烯基单体发生加成聚合反应的乙烯基不饱和羧酸单体,以及(3)能在羧酸单体存在下开环的环酯分子结合在一起,从而产生一种反应剂引发的可聚合混合物;以及
将反应剂引发的可聚合混合物置于预选的温度和压力下,使乙烯基单体和乙烯基不饱和羧酸单体自由加成聚合,形成接枝聚合物的主链,并使环酯分子在其内酯键处环开,接枝到聚合物主链上,从而形成接枝聚合物的侧链、
该工艺的特点是接枝聚合物的主链和侧链的形成基本上是同时进行的。
本发明还提供了按照本发明工艺生产的接枝聚合物。