Process for the production of emulsifier-free,...

Details Process for the production of emulsifier-free,... Process for the production of emulsifier-free,...

C - Chemistry, Metallurgy

08

L

400/6447

C08L 9/08 (2006.01) C08F 2/22 (2006.01) C08F 212/02 (2006.01) C08F 236/04 (2006.01) C08L 9/04 (2006.01)

Patent

CA 1131378

ABSTRACT OF THE DISCLOSURE A process for the production of an emulsifier-free self-crosslinkable rubber latex (meth)acrylic acid, N-alkoxymethyl (meth)acrylamide and acyclic conjugated dienes arylvinyl monomers and/or (meth)acrylonitrile, wherein an aqueous emulsion is prepared by adding at least part of the (meth)acrylic acid, part of the diene and further monomers to water, the polymerisation reaction 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 initiator are added in one or more further stages and the polymerisation reaction is continued at a pH-value of from 3.5 to 7 until at least 50% of the monomers and, in the last stage, until from 85 to 100 % of the monomers habe been polymerised. Le A 18 152

331433

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