Polymer processing additive having improved stability
US6294604A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1998 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Mar 6, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2201/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The extrusion of polymeric materials, especially thermoplastic polymeric materials, requires a number of physical attributes in the polymer to be controlled during extrusion to effect desirable surface characteristics on the extruded polymer. Extrusion additives have been provided for the improvement of these attributes and characteristics. The present invention describes an additive system for extrudable thermoplastic polymers, extrudable polymer compositions containing the additive system, and extrusion processes using polymers containing the additive system of this invention. The extrusion additive of the present invention comprises: PA1 (i) a fluorocarbon polymer, PA1 (ii) a poly(oxyalkylene) polymer, PA1 (iii) magnesium oxide, and PA1 (iv) optionally a stabilizer. The extrudable composition of the invention comprises: PA1 (A) an extrudable polymer (e.g., a predominant amount, such as at least 50% by weight of solids), and PA1 (B) an effective amount of the stabilized processing aid (extrusion additive).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.