Title:
MALEIC COPOLYMER, PROCESS FOR PRODUCING THE SAME AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/1995/003342
Kind Code:
A1
Abstract:
A maleic copolymer having a weight-average molecular weight of 1,000 to 100,000, a calcium ion scavenging capacity of at least 300 mgCaCO3/g, and a clay dispersing capacity of at least 1.2; and another maleic copolymer having a clay adsorption rate of 20-90 % and a stability constant with respect to calcium ions of at least 4.0. The process for producing these copolymers comprises the step of feeding maleic acid and/or its salt (A) in a concentration of at least 35 wt. % into a reactor, the step of feeding thereafter hydrogen peroxide in an amount of 3-20 wt. % based on the component (A) into the reactor, and the step of feeding thereafter a water-soluble ethylenic monomer (B) in a molar ratio of the component (A) to the component (B) of 95/5 to 5/95 into the reactor within a period of 30 to 500 minutes after the starting of the reaction, said monomer feed step being completed 10 to 300 minutes after the completion of said peroxide feed step. The obtained copolymers are used as a detergent composition, inorganic pigment dispersant, water treatment and fiber treatment.
Inventors:
YAMAGUCHI SHIGERU
TSUBOI KEISHI
IRIE YOSHIO
TSUBOI KEISHI
IRIE YOSHIO
Application Number:
PCT/JP1994/001180
Publication Date:
February 02, 1995
Filing Date:
July 18, 1994
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C02F1/56; C08F222/02; C09D17/00; C11D3/37; C11D17/04; C11D17/06; D06L1/12; D06L3/02; D06L4/12; D06M15/263; D06P1/52; (IPC1-7): C08F22/06; C11D3/37; D06L1/00; D06M15/263
Foreign References:
| JPH03124711A | 1991-05-28 | |||
| JPS59213714A | 1984-12-03 | |||
| JPH02120399A | 1990-05-08 | |||
| JPH051121A | 1993-01-08 |
Other References:
See also references of EP 0668298A4
Download PDF: