Process for the production of an elastomer-filler mixture optionally containing extender oils
AssigneeChemische Werke Huls Aktiengesellschaft
InventorsWolfgang Lukaschek, Wolfgang Marx
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Abstract
A process for producing an elastomer-filler mixture optionally containing an extender oil, comprising the combined precipitation of a homogeneous mixture of a synthetic elastomer latex, produced by emulsion polymerization in an anionic emulsifier system, and an aqueous suspension of a silicic acid based filler, using an acid and, optionally, an electrolyte or other flocculant; separation of the precipitated mixture; and drying of the mixture; is improved in that the filler suspension contains 0.1-5% by weight, based on the amount of filler, of a copolymer of acrylamide and dimethylaminoethyl methacrylate.
Claims11
In a process for producing an elastomer-filler mixture, optionally containing an extender oil comprising the combined precipitation of a homogeneous mixture of
- (a) a synthetic elastomer latex, produced by emulsion polymerization in an anionic emulsifier system, and
- (b) an aqueous suspension of a silicic acid based filler,
- using an acid and, optionally, an electrolyte or other flocculant;
- separation of the precipitated mixture;
- and drying of the mixture;
- the improvement wherein the filler suspension contains 0.1-5% by weight, based on the amount of filler, of a copolymer of acrylamide and dimethylaminoethyl methacrylate.
In a process for precipitating an elastomer-filler mixture, optionally containing an extender oil, comprising adding an acid and, optionally, an electrolyte or other flocculant to a homogeneous mixture of
- (a) a synthetic elastomer latex, produced by emulsion polymerization in an anionic emulsifier system, and
- (b) an aqueous suspension of a silicic acid based filler,
- the improvement wherein the filler suspension contains 0.1-5% by weight, based on the amount of filler, of a copolymer of acrylamide and dimethylaminoethyl methacrylate.
Dependencies are inferred from the claim text.