Statistical addn. copolymers of chloroprene - or 2,3-dichloro-1,3-butadiene or their mixtures with alpha-alkyl acrylic alkyl or cycloalkyl esters

摘要

The copolymers comprise 100 pts. wt. of the butadiene monomer or monomer mixture and >=10 pts. wt. of the ester monomer of formula (I): CH2=C(R)-C(O)-OR1 (where R is linear 1-4C alkyl; R1 is 1-12C alkyl or cycloalkyl) esp. methyl methacrylate or butyl methacrylate, additional units of these of orther acrylic monomers being grafted onto the copolymers. They are prepared by emulsifying the above components in the given proportions, in water in the presence of an anionic surfactant and a cation selected from triethanol-ammonium, tri(2-propanol)-ammonium, diethanol ammonium and 1-3C alkyl-diethanol-ammonium, adding the polymerisation catalyst and maintaining the reactants in emulsion until almost all the unsatd. comonomers have reacted to form the desired copolymer. The copolymers are resistant to plasticisers such as dioctyl phthalate.