Claims
- 1. A paper coating composition which contains, 100 parts by weight of a finely divided pigment, from 5 to 25 parts by weight of a copolymer A having a glass transition temperature of from -40.degree. to +50.degree. C., in the form of an aqueous dispersion, and from 0.5 to 10 parts by weight of one or more high molecular weight-containing copolymers B, wherein the improvement comprises using, as the copolymer B a copolymer having a K value of 60-140, which is prepared by solution copolymerization, and which contains:
- (a) from 20 to 70% by weight of copolymerized units of hydroxy-C.sub.2 -C.sub.4 -alkyl acrylates or hydroxy-C.sub.2 -C.sub.4 -alkyl methacrylates;
- (b) from 10 to 50% by weight of copolymerized units of compounds selected from the group comprising acrylic acid, methacrylic acid, maleic acid and monoesters of maleic acid; and
- (c) from 5 to 50% by weight of copolymerized units of compounds selected from the group comprising acrylonitrile, methacrylonitrile, C.sub.1 -C.sub.4 -alkyl acrylates or C.sub.1 -C.sub.4 -alkyl methacrylates, or vinyl esters of saturated C.sub.2 -C.sub.4 -carboxylic acids.
- 2. An improved paper-coating composition as claimed in claim 1, wherein copolymer B contains
- (a) from 30 to 55% by weight of hydroxypropyl acrylate units,
- (b) from 15 to 40% by weight of acrylic acid or methacrylic acid units and
- (c) from 20 to 40% by weight of acrylonitrile, methyl acrylate and/or ethyl acrylate units.
- 3. An improved paper-coating composition as claimed in claim 1, which contains from 0.1 to 2.0 parts by weight of an optical brightener.
Priority Claims (1)
Number |
Date |
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Kind |
2905765 |
Feb 1979 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 117,020, filed Jan. 30, 1980 now abandoned.
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3892675 |
Clarke et al. |
Jul 1975 |
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3985698 |
Matsudaira et al. |
Oct 1976 |
|
4102843 |
Sperry et al. |
Jul 1978 |
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4157995 |
Schenck et al. |
Jun 1979 |
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4258104 |
Lee et al. |
Mar 1981 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
117020 |
Jan 1980 |
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