Preparing polymer dispersion foams

Details Preparing polymer dispersion foams Preparing polymer dispersion foams

C - Chemistry, Metallurgy

08

F

C08F 2/24 (2006.01) C08C 1/065 (2006.01) C08F 6/14 (2006.01) C08F 236/04 (2006.01) C08J 9/22 (2006.01)

Patent

CA 2256030

The present invention relates to a process for preparing a polymer dispersion foam L, where: a) a mixture M which comprises at least one conjugated diene monomer A and at least one ethylenically unsaturated comonomer B is polymerized by free-radical aqueous emulsion polymerization in the presence of at least one emulsifier to give a fine polymer dispersion P, b) the fine polymer dispersion P is pressure-agglomerated to give a coarse polymer dispersion G, c) the polymer dispersion G is concentrated, if desired, and is mixed, if desired, with a reinforcer dispersion H, and d) the dispersion from c) is foamed to give a polymer dispersion foam L, which comprises adjusting the average particle size and the particle size distribution of G by varying a parameter selected from: I) the solids content of P, II) the agglomeration temperature in step b), III) the agglomeration pressure in step b), IV) the content of comonomer B in the mixture M, V) the concentration of the emulsifier in P, VI) the agglomeration throughput, to polymer dispersion foams obtainable by this process and to their use.

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