Cellulose acetate excellent in physical strength, and process for production thereof
US5914397A · kind A · utility
16Cited by
19References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1996 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Nov 21, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B3/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An object of the invention is to obtain cellulose acetate having improved physical properties, particularly film strength and improved flexibility of the molded product. Cellulose acetate having an average degree of acetylation of not less than 59%, viscosity average degree of polymerization (DP) of not less than 290. and concentrated solution viscosity (.eta.) according to falling ball viscosity method for viscosity average degree of polymerization (DP) expressed by the following formula (1): EQU 2.814.times.ln(DP)-11.753.ltoreq.ln(.eta.).ltoreq.7.28.times.ln(DP)-37.059( 1) and a process for the production thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.