US 5,856,418 A · Water-soluble monomer, water-soluble polymer and their production process and use

Abstract

A water-soluble monomer is shown by general formula (1) below. This monomer, for example, can be obtained by reacting asparagic acid and maleic anhydride in an aqueous basic solution under cooled conditions. A water-soluble polymer has a structural unit of general formula (2) below and a weight-average molecular weight of about 800 to about 8,000,000, and is, for example, produced by polymerizing a monomer including the water-soluble monomer of general formula (1). The water-soluble polymer has excellent chelating and dispersing actions and therefore can favorably be used for various purposes, such as, detergent compositions, inorganic-pigment dispersants, fiber-treating agents, water-treating agents, wood pulp-bleaching assistants. ##STR1##

Claims7

Dependent claims

A water-soluble polymer having a weight-average molecular weight of about 1,000 to about 20,000 and a structural unit having the following general formula (2):

##STR24## wherein R.sup.1 is H or COOX.sup.1 ;
R.sup.2 is H or CH.sub.2 COOX.sup.2 ;
R.sup.3 is COOX.sup.3, OH or CH.sub.2 COOX.sup.3 ;
X.sup.1 is H, Na, K or NH.sub.4 ;
X.sup.2 is H, Na, K or NH.sub.4 ;
X.sup.3 is H, Na, K or NH.sub.4 ;
X.sup.4 is H, Na, K or NH.sub.4 ;
and wherein R.sup.1 and R.sup.2 are not both H.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/831,565Filed 9 Apr 1997

Priority

JP 8-09392016 Apr 1996

Granted

5 Jan 1999

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C11D 3/3769
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds: polymerised monomers containing nitrogen, e.g.…
C07C 233/49
With the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom: having the carbon atom of…
C08F 20/58
Amides , e.g. N,N-dimethylacrylamide or N-isopropylacrylamide: containing oxygen in addition to the carbonamido oxygen , e.g.…
C08F 22/38
Amides or imides: amides

Water-soluble monomer, water-soluble polymer and their production process and use

Life of this patent

Water-soluble monomer, water-soluble polymer and their production process and use

Life of this patent

Abstract

Claims7