Regenerated cellulose film recovery process
US4098996A · kind A · utility
16Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1977 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Feb 22, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/914
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Waste raw uncoated and/or coated (such as saran, nitrocellulose and vinyl) regenerated cellulose film is treated to recover its plasticizer and cellulose components for recycling in the manufacture of regenerated cellulose film. The platicizer is first recovered from comminuted waste film particles via extraction with water. The moist comminuted film particles are then converted to viscose, from which coating solids, if any, are removed. The viscose is thereafter employed in the manufacture of regenerated cellulose film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.