Process for plasticizing polyvinyl alcohol resin
US4849256A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1988 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Mar 11, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/254
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved method for the production of a plasticizer-containing dry flowable polyvinyl alcohol (PVA) resin blend capable of thermoplastic processing. The method provides for the incorporation of plasticizers in intimate contact with the PVA resin without heating, cooling, or extended drying steps. Specifically, PVA resin granules having an appropriately small particle size distribution are spray-coated with a liquid plasticizer medium, and then mixed with a dry, fine powder coating medium to produce a flowable, dry plasticized PVA blend. Additional components, such as antioxidants, dyes, and antiblocking agents, may also be incorporated into the finished product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.