Batchwise preparation of crosslinked, finely divided polymers
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-002/18
출원번호
US-0028449
(1987-03-20)
우선권정보
DE-3609545 (1986-03-21)
발명자
/ 주소
Nowakowsky Bernhard H. (Ludwigshafen DEX) Beck Juergen (Mannheim DEX) Hartmann Heinrich (Limburgerhof DEX) Vamvakaris Christos (Kallstadt DEX)
출원인 / 주소
BASF Aktiengesellschaft (Ludwigshafen DEX 03)
인용정보
피인용 횟수 :
84인용 특허 :
2
초록▼
Crosslinked, finely divided, water-absorbing polymers are prepared in a batchwise process 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, metha
Crosslinked, finely divided, water-absorbing polymers are prepared in a batchwise process 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, methacrylamide or N-vinylpyrrolidone with, as a crosslinking agent, from 0.01 to 5 parts by weight of a monomer containing two or more ethylenically unsaturated double bonds in 20-80% by weight aqueous solution in the presence of an initiator in a multistage procedure in a batchwise mixing apparatus wih 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.
대표청구항▼
A process for the batchwise preparation of a crosslinked, finely divided, Water-absorbing polymer, which comprises multistage copolymerization in a batchwise mixing apparatus, with constant thorough mixing in all stages, of 100 parts by weight of a monomer from group (a) or of a monomer mixture from
A process for the batchwise preparation of a crosslinked, finely divided, Water-absorbing polymer, which comprises multistage copolymerization in a batchwise mixing apparatus, with constant thorough mixing in all stages, of 100 parts by weight of a monomer from group (a) or of a monomer mixture from groups (a) 50-100 parts by weight of acrylic acid or methacrylic acid, each of which has been neutralized with from 0 to 100 mol % of an alkali metal or ammonium base, acrylamide, methacrylamide and N-vinylpyrrolidone, (b) 0-30 parts by weight of other water-soluble monoethylenically unsaturated monomers and (c) 0-20 parts by weight of water-insoluble monoethylenically unsaturated monomers with from 0.01 to 5 parts by weight of, as a crosslinking agent, a monomer containing two or more ethylenically unsaturated double bonds, in 20-80% by weight aqueous solution in the presence of an initiator at above 45°C., in the first stage the aqueous monomer solution being copolymerized at from 45°to 95°C. 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 up to 8 bar and, in the third stage, after the pressure has been let down, the water content of the resulting finely divided copolymer being reduced to 0.5-10% by weight under reduced pressure at from 70°to 180°C. or under atmospheric pressure at from 120°to 180°C.
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