Batchwise preparation of crosslinked, finely divided polymers

Details Batchwise preparation of crosslinked, finely divided polymers Batchwise preparation of crosslinked, finely divided polymers

C - Chemistry, Metallurgy

08

F

402/404

C08F 2/10 (2006.01) A61L 15/00 (2006.01) A61L 15/60 (2006.01)

Patent

CA 1282200

Abstract of the Disclosure: Crosslinked, finely divided, water-absorbing polymers are prepared in a batchwise pro- cess by copolymerization of 100 parts by weight of a monomer mixture of acrylic acid or methacrylic acid, each of which is neutralized with from 0 to 100 mol% of an alkali metal or ammonium base, or acrylamide, methacryl- amide or N-vinylpyrrolidone with, as a crosslinking agent, from 0.01 to 5 parts by weight of a monomer con- taining two or more ethylenically unsaturated double bonds in 20-80% by weight aqueous solution in the pre- sence of an initiator in a multistage procedure in a batchwise mixing apparatus with constant thorough mixing in all stages, in the first stage the aqueous monomer solution being copolymerized at from 45 to 95°C and under from 0.1 to 0.8 bar with removal of some of the water by distillation, in the second stage the copolymerization being completed at from 100 to 170°C under a pressure of up to 8 bar, and in the third stage the water content of the resulting finely divided copolymer being decreased to 0.5-10% by weight under reduced pressure.

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