Cellulose hydrate tubing with aging-resistant barrier layer and processes for the manufacture thereof

US4283426A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Harald Schenk · Dresden, DE
• Hermann Winter · Marl, DE
• Walter Spietschka · Wiesbaden, DE

Key dates

• Filing date: Jul 25, 1979
• Grant date: Aug 11, 1981
• Expiry date: Jul 25, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/1324
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Disclosed is a packaging material comprising a base layer of cellulose hydrate having on one surface a film coating which is impervious to water vapor, water and oxygen and which comprises a vinylidene chloride copolymer containing from about 90 to 92 percent by weight of vinylidene chloride, from about 5.5 to 7 percent by weight of acrylonitrile, from about 1.5 to 3.5 percent by weight of methyl methacrylate and from about 0.5 to 1.5 percent by weight of itaconic acid, said copolymer having a relative viscosity of about 1.04 measured at 23.degree. C. in a 0.1 percent strength by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and a relative viscosity of 2.8 measured at 23.degree. C. in a 3 percent by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and said film coating having a thickness corresponding to a weight per unit area in the range between about 3 and 10 g/m.sup.2. Also disclosed are a sausage casing of such material and a method for producing same.