Claims
- 1. Low-foam surface sizing agents for paper in the form of aqueous or aqueous-alcoholic alkali metal, amine or ammonium salt solutions of copolymers containing carboxylic acid semi-amide groups obtainable by reacting substantially equimolar copolymers of maleic acid anhydride and diisobutylene and/or terpolymers of maleic acid anhydride, diisobutylene and a vinyl monomer copolymerizing with maleic acid anhydride, with from 15 to 40 mole percent, based on maleic acid anhydride groups, of n-butyl amine.
- 2. Sizing agents as claimed in claim 1, wherein the solutions contain from 10 to 200% by weight, based on copolymer and terpolymer, respectively, of urea, alkyl substituted urea or hydroxyalkyl substituted urea.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2840650 |
Sep 1978 |
DEX |
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2928984 |
Jul 1979 |
DEX |
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CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application Ser. No. 227,950 filed Jan. 23, 1981, now abandoned, which in turn is a continuation of Ser. No. 075,519 filed Sept. 13, 1979, now abandoned.
US Referenced Citations (9)
Continuations (2)
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Number |
Date |
Country |
Parent |
227950 |
Jan 1981 |
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Parent |
075519 |
Sep 1979 |
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