Process for the production of emulsifier-free rubber latices

Details Process for the production of emulsifier-free rubber latices Process for the production of emulsifier-free rubber latices

C - Chemistry, Metallurgy

08

F

400/9188

C08F 2/22 (2006.01) C08F 212/02 (2006.01) C08F 236/04 (2006.01) C09D 5/02 (2006.01) C09D 11/10 (2006.01)

Patent

CA 1153140

Abstract of the Disclosure A process for the production of an emulsifier-free rubber latex from (meth)acrylic acid and a mixture of acyclic conuugated dienes and arylvinyl monomers and/or (meth)acrylonitrile, wherein an aqueous emul- sion is prepared by adding at least part of the (meth) acrylic acid, part of the diene and other monomers to water, polymerisation is initiated by the addition of an aqueous solution of a peroxodisulphate and is carried out in a first stage at a pH-value of from 3.5 to 7 until at least 50 % of the monomers have been polymerised, the rest of the monomers and of initiator are added in one or more further stages, and polymerisation is continued at a pH-value of from 3.5 to 7 until at least 50 % of the monomers and, in the final stage, until from 85 to 100 % of the mono- mers have been polymerised. Le A 18 151 -

331439

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