Hydrolysis-resistant, film-forming copolymer dispersions

US4073779A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Hubert Wiest · Burghausen, DE
• Rainer Berger · Remscheid, DE
• Erwin Lieb

Key dates

• Filing date: Aug 11, 1976
• Grant date: Feb 14, 1978
• Expiry date: Aug 11, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F218/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A hydrolysis-resistant, film-forming, aqueous dispersion of a copolymer consisting essentially of PA1 (a) from 5% to 50% by weight of ethylene units, PA1 (b) from 10% to 60% by weight of vinyl alkanoate units having from 1 to 14 carbon atoms in the alkanoate moiety, PA1 (c) from 20% to 70% by weight of vinyl chloride units, and PA1 (d) from 5% to 30% by weight of alkyl methylacrylate units having from 1 to 8 carbon atoms in the alkyl moiety; as well as the hydrolysis-resistant films produced on drying the above aqueous dispersion having a hydrolysis resistance in a 5.times. 5 cm film having a thickness of 0.1.+-. 0.02 mm, such that after storage for four days in a 25% aqueous sodium hydroxide solution, its weight loss is less than 10%.