Method for reducing the unreacted vinylidene chloride content of a vinylidene chloride polymer
US4168372A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1976 |
| Grant date | Sep 18, 1979 |
| Priority date | — |
| Expiry date | Jul 15, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F259/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for reducing the amount of free vinylidene chloride in an aqueous dispersion of a vinylidene chloride polymer by adding to the dispersion a small amount of a redox initiator, and then subjecting the dispersion to a temperature in the range of room temperature to about 40.degree. C. for a period of at least one hour. Substrates such as packaging films can be coated with the aqueous dispersion, or with a solvent solution of the polymer after separation from the dispersion. By use of such a coating bath, the amount of vinylidene chloride vapor in the atmosphere near the coating station is significantly less than the amount when using a coating bath of polymer not subjected to the method of the invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.