Thermoplastic polyolefin compositions and methods of preparing thermoplastic polyolefin compositions for soft sheet applications
US7037979B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2002 |
| Grant date | May 2, 2006 |
| Priority date | — |
| Expiry date | Mar 29, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L25/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Thermoplastic polyolefin compositions and a process for preparing the same are provided comprising a blend of polypropylene, and styrenic elastomer. The compositions may further comprise ethylene copolymer elastomer, polymer additive, such as polymer surface modifier, powder flow additive, stabilizer and/or color pigment. The compositions are particularly applicable for use in a slush molding process where low melt viscosity is desired to form improved surface quality thermoplastic polyolefin skin. A process is disclosed for preparing thermoplastic polyolefin into a slush moldable powder by melt compounding the composition to form pellets, and further processing the pellets by cryogenic pulverization or by extruding micropellets in one step using a gear pump to increase the melt pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.