Cellulose acetate excellent in physical strength, and process for production thereof
US5990304A · kind A · utility
9Cited by
20References
11Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 9, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Oct 9, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L1/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An object of the invention is to obtain cellulose acetate with improved physical properties, particularly film strength arid improved flexibility of the molded product. Cellulose acetate wherein average degree of acetylation is not less than 59%, viscosity average degree of polymerization (DP) is not less than 290, and concentrated solution viscosity (.eta.) according to the falling ball viscosity method for viscosity average degree of polymerization (DP) is expressed by the following formula (1): 2.814.times.ln(DP)-11.753.ltoreq.ln(.eta.).ltoreq.7.28.times.ln(DP)-37.059 (1) and a process for production thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.