| 摘要 |
<p>1441314 Polymerizing vinylidene fluoride PENNWALT CORP 16 Oct 1973 [17 Oct 1972] 48193/73 Heading C3P Vinylidene fluoride is polymerized or copolymerized in aqueous suspension in the presence of 0À5-1À5% (by weight of total monomer feed) of diisopropylperoxydicarbonate as initiator, 10-50% of 1,1,2-trichlorotrifluoroethane as accelerator and 0À5-5À5% of acetone as chain transfer agent at a temperature of 35-100‹ C. and a pressure of 300-1000 p.s.i. the monomer and initiator system being added incrementally or continuously such that a conversion rate of 30-250 gms. of monomer to polymer per litre of reaction mixture per hour is attained.</p> |
