Method of preparing polymers with a low residual content of mono

Details Method of preparing polymers with a low residual content of mono Method of preparing polymers with a low residual content of mono

1988-07-21

1990-05-29

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528492, 525374, 525377, 525380, 5263031, 5263171, C08F 610

Patent

active

049297171

ABSTRACT:
The invention concerns a method of preparing homopolymers or copolymers that are water-soluble or swell up in water and have a low residual monomer content by treating them with at least one compound that can react with the monomer's double bond. The homopolymer or copolymer in the swollen form and in the form of a gel or in the form of a solution is treated with a compound, such as for example ammonia, an ammonium salt, an alkylamine and/or one of their salts or a hydroxylamine and/or their salts, that can react with the monomer's double bond and contains nitrogen or with a compound, such as a hydrogen halide, an acetoacetate, or a malonate, that contains an active hydrogen atom, or with a compound, such as bromosuccinimide, pyridinium bromide, or dioxane perbromide, that contains bromine and allows bromine to attach to the double bond, or with a compound, such as a permanganate, a bichromate, a chromate, selenium dioxide, or ozone, that can oxidize the double bond, or with a compound, such as an alkali sulfite or ammonium sulfite, an alkali or ammonium hydrogen sulfite or disulfite, or a thio compound, that contains sulphur, subsequent to which the resulting polymer gel or polymer solution is dried at an elevated temperature.

REFERENCES:
patent: 3755280 (1973-08-01), Saunders
patent: 4242500 (1980-12-01), Franceschini
patent: 4251412 (1981-02-01), Ferrini
patent: 4375529 (1983-03-01), Fong
patent: 4414063 (1983-11-01), Smiley
patent: 4529753 (1985-07-01), Taylor
patent: 4587306 (1986-05-01), Vio et al.

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