Plasticized cellulose acetate, process for its production and its use for producing filaments
US5480922A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1994 |
| Grant date | Jan 2, 1996 |
| Priority date | — |
| Expiry date | Jul 27, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L67/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A plasticized cellulose acetate is described with a content of a modified cellulose acetate A comprising a grafted oligomer of a cyclic ester, in particular in the form of .epsilon.-caprolactone, which comprises additionally a plasticizing agent in the form of an oligomer B of a cyclic ester, and the terminal carboxyl group of the oligomer is esterified with an alcohol or an alcohol derivative having at least one free hydroxyl group, with a boiling point of at least approximately 120.degree. C. and a melting point of no more than approximately 180.degree. C. and the ratio of weight of component A to B is represented by the formula (I) EQU 0.3.ltoreq.A/(A+B).ltoreq.0.95 (I). This plasticized cellulose acetate can be produced advantageously for example when an oligomer B in the form of the reaction product of a cyclic ester, in particular in the form of .epsilon.-caprolactone, and a monofunctional and/or polyfunctional alcohol and/or an alcohol derivative comprising at least one free hydroxyl group, is reacted in the melt in the presence of a catalyst with a cellulose acetate comprising hydroxyl groups. This process is economical. Relative to known products, the product of this proce…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.