Thermoplastic compositions of atactic and syndiotactic polypropylene
US5834562A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1995 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Aug 8, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2207/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Thermoplastic polymer compositions are disclosed which comprise the following components: PA0 (A) 1 to 99% by weight of an amorphous propylene polymer having the following characteristics: PA1 .eta.!>1 dl/g, PA1 % of syndiotactic dyads (r)-% of isotactic dyads (m)>0, PA1 less than 2% of the CH.sub.2 groups contained in (CH.sub.2).sub.n sequences wherein n.gtoreq.2, PA1 Bernoullianity index=1.+-.0.2; and PA0 (B) 1 to 99% by weight of a propylene polymer having an essentially syndiotactic structure, optionally containing from 0.1 to 30% by moles of units deriving from .alpha.-olefins of formula CH.sub.2 .dbd.CHR in which R is an hydrogen atom or an alkyl group having from 2 to 10 carbon atoms. The compositions of the invention are endowed with good elasto-mechanical properties and are suitable for the production of low-temperature-heat-sealing films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.