Molded bodies comprising bond material based on cellulose acetate and reinforcing natural cellulose fibers, a process for the production and the use thereof

US5883025A · kind A · utility

Assignee

• Rhone-Poulenc Rhodia Aktinegesellschaft · DE

Inventors

• Ties Karstens · Reutlingen, DE
• Joachim Schatzle · Herbolzheim, DE
• Robert Köhler · Leipzig, DE
• Michael Wedler · Reutlingen, DE
• Martin Tubach · Reutlingen, DE

Key dates

• Filing date: Feb 19, 1997
• Grant date: Mar 16, 1999
• Expiry date: Feb 19, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/619
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

Described are molded bodies comprising bond material based on cellulose acetate as a bonding agent and reinforcing natural cellulose fibers or natural cellulose-containing fibers. These components are characterized by the fact that the cellulose acetate has a degree of substitution (DS) of approximately 1.2 to 2.7 and the molded bodies have a Vicat temperature of at least approximately 160.degree. C. and the ratio of the weight of cellulose acetate to the natural cellulose fibers or natural cellulose-containing fibers is approximately 10:90-90:10. These molded bodies are produced by mixing cellulose acetate with the natural cellulose fibers or the natural cellulose-containing fibers in a ratio by weight of approximately 90:10-10:90, in particular 15:85-85:15, in the total moisture content is adjusted to at least approximately 3% by weight, with respect to the total amount of the cellulose acetate in the mixture, and this mixture is molded at a temperature of approximately 220.degree. to 280.degree. C. and a pressure of approximately 30 to 150 bars. The molded bodies according to the invention can advantageously be used as interior parts of automobiles, in particular as roof ceiling…