Cationic sizing agent for paper, and a process for its preparation

Patent 4659431 Issued on April 21, 1987. Estimated Expiration Date:

January 16, 2005. 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

Method of treating fibrous materials with polymers stabilized with polymerizable vinylbenzyltrialkyl ammonium salt surfactant
Patent #: 4152201
Issued on: 05/01/1979
Inventor: Killam

Sizing agent for use in making paper
Patent #: 4200562
Issued on: 04/29/1980
Inventor: Yoshioka , et al.

Cationic sizing agent for paper and a process for the preparation thereof Patent #: 4434269
Issued on: 02/28/1984
Inventor: Probst , et al.

Inventors

Application

No. 06/691991 filed on 01/16/1985

US Classes:

162/168.2, Nitrogen containing compound162/158, Non-fiber additive162/169, From polyene compound524/538, 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 polyamine524/829Two or more N monomers

Examiners

Primary: Chin, Peter

Attorney, Agent or Firm

Sprung Horn Kramer & Woods

International Classes

C08F 2/24 (20060101)
C08F 2/12 (20060101)
C08F 212/00 (20060101)
C08F 212/08 (20060101)
C08F 257/02 (20060101)
C08F 257/00 (20060101)
D21H 17/45 (20060101)
D21H 17/00 (20060101)
D21H 17/35 (20060101)
D21H 17/37 (20060101)
D21H 21/14 (20060101)
D21H 21/16 (20060101)

Foreign Application Priority Data

1984-01-18 DE

Abstract

New, highly effective cationic sizing agents for paper have been provided. They can be obtained by a method in which a water-soluble cationic chemically pure terpolymer compound consisting of(a) 7-40% by weight of N,N-dimethylaminoethyl acrylate and/or methacrylate,(b) 40-80% by weight of styrene and(c) 4-40% by weight of acrylonitrileis dissolved in an aqueous medium, the sum of the components (a) to (c) always being 100% by weight and at least 10% of the N,N-dimethylamino groups of the terpolymer being quaternized and the remainder being protonated, and, in the presence of 10 to 70% by weight, relative to the monomer mixture below, of this emulsifier,(d) 0 to 90% by weight of acrylonitrile and/or methacrylonitrile,(e) 5 to 95% by weight of styrene and(f) 5 to 95% by weight of acrylates and/or methacrylates having 1 to 12 C atoms in the alcohol radical,the sum of the components (d) to (f) always being 100% by weight, are emulsified, and the emulsion thus obtained is subjected to free radical-initiated emulsion polymerization at temperatures from 20° to 150° C.