Copolymers formed from polymerization of N,N-diallyl-N-alkyl-N-(

Details Copolymers formed from polymerization of N,N-diallyl-N-alkyl-N-( Copolymers formed from polymerization of N,N-diallyl-N-alkyl-N-(

1996-09-19

1998-08-04

Henderson, Christopher

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210697, 210698, C02F 100

Patent

active

057888663

ABSTRACT:
The invention is a water-soluble N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine containing copolymer, wherein said copolymer is formed from the polymerization of an N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine of the formula: ##STR1## wherein R is selected from the group consisting of alkyl and aryl groups, and R.sub.1 is selected from the group consisting of alkyl groups, aryl groups, and alkylaryl groups, and an anionic monomer.
The invention is also a method of inhibiting the precipitation and deposition of scale on metal surfaces in contact with industrial cooling waters comprising the addition of an effective, scale-inhibiting amount of a water-soluble N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine containing copolymer, wherein said copolymer is formed from the polymerization of a betaine of the formula: ##STR2## wherein R is selected from the group consisting of alkyl and aryl groups, and R.sub.1 is selected from the group consisting of alkyl groups, aryl groups, and alkylaryl groups, and an anionic monomer.
A preferred polymer is a water-soluble copolymer of N,N-diallyl-N-methyl-N-(2-sulfoethyl) ammonium betaine and acrylic acid.

REFERENCES:
patent: 4088678 (1978-05-01), Matt et al.
patent: 4585846 (1986-04-01), Schulz et al.
patent: 4801388 (1989-01-01), Fong et al.
patent: 4913824 (1990-04-01), Kneller
patent: 5015390 (1991-05-01), Chen et al.
patent: 5087376 (1992-02-01), Bendiksen et al.
patent: 5415782 (1995-05-01), Dimas

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