Cationic sizing agent for paper and a process for the preparation thereof

Patent 4434269 Issued on February 28, 1984. Estimated Expiration Date:

February 2, 2002. 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

2808388

Hydrophilic aqueous coating composition containing aqueous binder solution and select homogeneous aqueous dispersion of polymer particles
Patent #: 3941727
Issued on: 03/02/1976
Inventor: Timmerman , et al.

Method of coating with aqueous thermosetting acrylic polymer latex of uniform particle size
Patent #: 4166882
Issued on: 09/04/1979
Inventor: Das , et al.

Process for making cationic structured particle latexes using reactive polymeric surfactants Patent #: 4337185
Issued on: 06/29/1982
Inventor: Wessling , et al.

Inventors

Application

No. 06/344991 filed on 02/02/1982

US Classes:

524/538, Solid polymer or SICP derived from at least one nitrogen-containing carboxylic acid or derivative reactant or from a carboxylic acid or derivative and a polyamine428/514, Ester, halide or nitrile of addition polymer524/829Two or more N monomers

Examiners

Primary: Schofer, Joseph L.
Assistant: Sarofim, N.

Attorney, Agent or Firm

Connolly and Hutz

International Classes

C08F 257/02 (20060101)
C08F 2/12 (20060101)
C08F 2/28 (20060101)
C08F 220/42 (20060101)
C08F 220/06 (20060101)
C08F 220/00 (20060101)
C08F 257/00 (20060101)
D21H 17/45 (20060101)
D21H 17/00 (20060101)
D21H 17/37 (20060101)
D21H 17/43 (20060101)
D21H 17/35 (20060101)
D21H 21/14 (20060101)
D21H 21/16 (20060101)

Foreign Application Priority Data

1981-02-05 DE

Abstract

Cationic sizing agents for paper in the form of an aqueous colloid-disperse solution having average particle diameters of from 15 to 200 nm are obtained by dissolving a water-soluble cationic, chemically uniformaly composed terpolymer compound of:(a) from 7 to 40% by weight of N,N-dimethylaminoethyl acrylate and/or methacrylate,(b) from 45 to 80% by weight of styrene, and(c) from 4 to 40% by weight of acrylonitrilein an aqueous medium, the total of components (a) to (c) always amounting to 100% by weight and at least 10% of the N,N-dimethylamino groups of the terpolymer being quaternized and the rest being protonated, and by emulsifying, in the presence of from 10 to 70% by weight, based on the following monomer mixture, of this emulsifier,(d) acrylonitrile or methacrylonitrile in quantities of from 5 to 95% by weight, with(e) C1 -C12 -alkyl esters of acrylic acid and/or of methacrylic acid in quantities of from 5 to 95% by weight,the total of components (d) and (e) amounting to 100% by weight, and by subjecting the emulsion thus obtained to a radically initiated emulsion polymerization process at temperatures of from 20° to 150° C.