| abstract |
Process for the preparation of an emulsifier-free, self-crosslinking rubber latex made from (methacrylic acid, N-alkoxymethyl- (meth) acrylamide and a mixture of acyclic conjugated dienes and arylvinyl monomers and / or (meth) acrylonitrile, whereby an aqueous emulsion is prepared by at least a part of (Meth) acrylic acid, a portion of diene and other monomers are added to water, the polymerization is started by adding an aqueous solution of a peroxodisulfate, and at a pH between 3.5 and 7 in a first stage up to a conversion of at least 50 % of the monomers polymerized, the rest of the monomers and the initiator are added in one or more further stages, and the polymerization at a pH of 3.5 to 7 until a respective conversion of at least 50% of the M monomers and in the last Level continues up to a turnover of 85 to 100%. |