Process and apparatus for manufacture of processable polyvinyl alcohol
US10316120B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2016 |
| Grant date | Jun 11, 2019 |
| Priority date | — |
| Expiry date | Sep 16, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention describes a method for the manufacture of a plasticized polyvinyl alcohol polymer mixture, the method including the steps of introducing a polyvinyl alcohol polymer with a degree of hydrolysis of at least 98 wt % or a blend of the polyvinyl alcohol polymer into a mixing reactor; reacting a reaction mixture comprising a processing agent, plasticizer and polyvinyl alcohol polymer in a reaction zone to form plasticized polyvinyl alcohol polymer; wherein the processing agent is water, or a mixture of water and one or more C1-C4 alcohols or other hydroxyl compounds wherein the boiling point of the processing agent is less than the boiling point of the plasticizer; wherein the processing agent is from 3 wt % to 18 wt % in the reaction mixture; and allowing the plasticized polyvinyl alcohol polymer mixture to pass from the mixing reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.