Patent · US Expired

Aqueous pigment suspensions based on alkyl (meth) acrylates as dispersants for pigments

US4801354A · kind A · utility

0Cited by

4References

6Claims

0Family size

Assignee

BASF SE

Inventors

Guenter Hirsch · Mutterstadt, DE
Werner Auhorn · Bischofswerda, DE

Key dates

Filing date	Apr 16, 1987
Grant date	Jan 31, 1989
Priority date	—
Expiry date	Apr 16, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09K23/34
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Aqueous pigment suspensions which are added to the stock suspension during papermaking and contain, as a dispersant, from 0.1 to 2% by weight, based on the pigment, of a copolymer which contains, as copolymerized units, PA0 (a) from 40 to 95% by weight of an ester of (meth)acrylic acid with a saturated monohydric C.sub.1 -C.sub.8 -alcohol or with a saturated dihydric C.sub.2 -C.sub.4 -alcohol and PA0 (b) from 60 to 5% by weight of an ethylenically unsaturated C.sub.3 -C.sub.5 -carboxylic acid and has a K value of from 10 to 65 (determined according to H. Fikentscher in 1% aqueous solution in the form of the ammonium salt at pH 9 and at 20.degree. C.), their preparation and their use.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.