Cellulose ester moulding materials with improved toughness

US4801632A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Herbert Eichenauer · Dormagen, DE
• Christian Lindner · Bensheim, DE
• Friedemann Muller · Neuss, DE
• Hartwig Hocker · Eckersdorf, DE
• Helmut Keul · Aachen, DE

Key dates

• Filing date: Feb 24, 1987
• Grant date: Jan 31, 1989
• Expiry date: Feb 24, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L1/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Thermoplastic moulding materials consisting of PA0 (1) 70 to 99.9% by weight of a cellulose ester or cellulose mixed ester PA0 (2) 0.1 to 30% by weight of a rubber polymer built up in the form of blocks from recurring structural units (I) with molecular weights of 10,000 to 1,000,000 EQU --A--B-- I wherein PA0 A denotes bifunctional polysiloxane segements of the formula EQU --(R.sup.1)(R.sup.2)SiO--.sub.x II in which PA0 R.sup.1 and R.sup.2 =aryl (in particular phenyl) or alkyl (in particular methyl) and PA0 x is a number such that the molecular weight is .gtoreq.500, and PA0 B denotes bifunctional aliphatic polyester and/or aliphatic polyester segments with molecular weights of .gtoreq.800, PA0 and the glass transition temperatures of the polymeric blocks A and B are less than 20.degree. C., which contains additionally PA0 (3) 0 to 30% by weight based on the mixture of (1) and (2) of a plasticizer.