Vinyl alcohol copolymers and water-soluble films containing them

US5914368A · kind A · utility

Assignee

• Teich Aktiengesellschaft · AT

Inventors

• Heinz Haschke · Bad Sankt Leonhard im Lavanttal, AT
• Ralf Rausch · Alzenau, DE
• Franz Reiterer · Getzersdorf, AT
• Felix Wehrmann · Wien, AT

Key dates

• Filing date: Jan 15, 1997
• Grant date: Jun 22, 1999
• Expiry date: Jan 15, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2329/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The description relates to vinyl alcohol copolymers which can be produced by the acid-catalysed acetalisation reaction of polyvinyl alcohols with a degree of saponification of 80-99.5 mol % and preferably between 88 and 99.5 mol % with natural substances or their derivatives containing carbonyl or presumptive carbonyl groups. The description also relates to water-soluble films containing such vinyl alcohol copolymers, the solubility of which can be adjusted to the desired solution temperature. Said water-soluble films are used as packaging materials and auxiliaries, e.g. in the form of sealing lacquers.