Thermoplastic filled membranes of propylene copolymers
US6750284B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2000 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | May 15, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31935
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a thermoplastic membrane (e.g. film, fluid barrier, and the like) which is formed from a blend of:a) a first polymer component (FPC), wherein said FPC comprises a propylene-ethylene copolymer containing from 80 to 93 percent by weight of units derived from propylene, and having a melting point derived from stereoregular polypropylene sequences, as determined by differential scanning calorimetry (DSC), in the range of from 25° C. to 70° C., and a heat of fusion of from 2 J/g to 25 J/g;b) an inorganic filler;c) a processing oil, andd) optionally, a second polymer component (SPC), wherein said SPC is a stereoregular polypropylene containing less than 7 percent by weight of units derived from ethylene or alpha-olefin monomer containing from 4 to 8 carbon atoms and having melting point, as determined by DSC, greater than 130° C., and a heat of fusion greater than 80 J/g.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.