Sizing agents for paper based on finely divided aqueous dispersions

Patent 4835212 Issued on May 30, 1989. Estimated Expiration Date:

January 20, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3061471

3061472

Stable, liquid starch graft copolymer composition
Patent #: 4301017
Issued on: 11/17/1981
Inventor: Kightlinger , et al.

Aqueous polymer dispersions preparation
Patent #: 4560724
Issued on: 12/24/1985
Inventor: Brabetz , et al.

Polyacrylate dispersions Patent #: 4670505
Issued on: 06/02/1987
Inventor: Craig

Inventors

Assignee

BASF Aktiengesellschaft

Application

No. 07/146193 filed on 01/20/1988

US Classes:

524/734, Starch or derivative, farinaceous flour or meal524/47, Starch or derivative or farinaceous meal or flour524/827, N-containing monomer524/831, With unsaturated carboxylic acid or ester monomer524/832Monomer is carboxylic acid or derivative

Examiners

Primary: Kight, John
Assistant: Nutter, Nathan M.

Attorney, Agent or Firm

Oblon, Fisher, Spivak, McClelland & Maier

International Classes

C08F 220/00 (20060101)
C08F 220/18 (20060101)
D21H 17/00 (20060101)
D21H 17/28 (20060101)
D21H 17/37 (20060101)
D21H 21/14 (20060101)
D21H 21/16 (20060101)

Foreign Application Priority Data

1987-01-30 DE

Abstract

Sizing agents for paper are based on finely divided aqueous dispersions of copolymers obtainable by copolymerizing from 40 to 140 parts by weight of a monomer mixture of(a) from 20 to 65% by weight of (meth)acrylonitrile,(b) from 35 to 80% by weight of one or more acrylates of monohydric saturated C3 -C8 -alcohols and(c) from 0 to 10% by weight of other ethylenically unsaturated copolymerizable monomers,the weight percentages (a), (b) and (c) always adding up to 100, in the manner of an emulsion polymerization in 100 parts by weight of an aqueous solution containing in solution from 2.7 to 15% by weight of a degraded starch having a viscosity ni from 0.04 to less than 0.12 dl/g at from 40° to 100° C. in the presence of a peroxide initiator.