Paper size based on finely divided aqueous dispersions

Patent 4855343 Issued on August 8, 1989. Estimated Expiration Date:

July 16, 2007. 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

3785921

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.

Cationic sizing agent for paper, and a process for its preparation
Patent #: 4659431
Issued on: 04/21/1987
Inventor: Probst , et al.

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

Inventors

Assignee

BASF Aktiengesellschaft

Application

No. 07/074031 filed on 07/16/1987

US Classes:

524/47, Starch or derivative or farinaceous meal or flour524/48, Dextrin or derivative524/734, Starch or derivative, farinaceous flour or meal524/820, With N monomer524/831With unsaturated carboxylic acid or ester monomer

Examiners

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

Attorney, Agent or Firm

Oblon, Spivak, McClelland, Maier & Neustadt

International Classes

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

Foreign Application Priority Data

1986-08-14 DE

Abstract

Sizes for paper are based on finely divided aqueous dispersions of copolymers which are obtainable by copolymerization of from 10 to 56 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 by an emulsion polymerization method in 100 parts by weight of an aqueous solution of from 1.7 to 25% by weight of a degraded starch having a viscosity ηi of from 0.12 to 0.50 dl/g, at from 40° to 100° C. in the presence of a peroxide-containing initiator.