Cellulose ester compositions and shaped articles
US5804296A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 4, 1995 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Dec 4, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/60
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A composition comprises a cellulose acetate or other cellulose ester, and an anatase-type titanium oxide having (1) a specific surface area of not less than 30 m.sup.2 /g, (2) a primary particle size of 0.001 to 0.07 .mu.m, or (3) a specific surface area of not less than 30 m.sup.2 /g and a primary particle size of 0.001 to 0.07 .mu.m. For improving the photodegradability and the dispersibility, the surface of the titanium oxide may be treated with a phosphoric acid salt or other phosphorus compound, a polyhydric alcohol, an amino acid or others. Use of a low-substituted cellulose ester with an average substitution degree not exceeding 2.15 insures high biodegradability. The composition may further contain a plasticizer and/or an aliphatic polyester, a biodegradation accelerator (e.g. organic acids or esters thereof). The degradable cellulose ester composition is highly photodegradable and moldable and hence useful for the manufacture of various articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.