Propylene polymer compositions
US5412020A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1994 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Jul 28, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/035
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The propylene polymer composition of the invention comprises, as its essential components, a specific propylene polymer [A] described below and a propylene block copolymer [B]. In addition to the propylene polymer [A] and the propylene block copolymer [A], the propylene polymer composition may contain a thermoplastic elastomer [C] selected from polystyrene.polyethylene/poybutylene.polystyrene block copolymers and ethylene/.alpha.-olefin random copolymers, or may further contain an inorganic filler [D]. The propylene polymer [A] used in the invention has the following characteristic properties: (1) a boiling heptane-insoluble component is contained in said polymer in an amount of not less than 96% by weight, PA1 (2) a pentad isotacticity [M.sub.5 ] of the boiling heptane-insoluble component obtained from the following formula (1) using a .sup.13 C-NMR spectrum is in the range of 0.970 to 0.995: ##EQU1## (3) a pentad tacticity [M.sub.3 ] of the boiling heptane-insoluble component obtained from the following formula (2) using a .sup.13 C-NMR spectrum is in the range of 0.0020 to 0.0050: ##EQU2## and (4) a melt flow rate (MFR) of said polymer is in the range of 5 to 50 g/10 min. The pr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.