Compositions of ethylene polymers, and method for the preparation thereof
US4861834A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1987 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Oct 6, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The compositions contain: PA0 (a) from 90 to 99.8% by weight of at least one modified polymer of ethylene and, where appropriate, at least one .alpha.-olefin having from 3 to 12 carbon atoms, the said polymer containing at least 80 mol % of units derived from ethylene, and PA0 (b) from 0.2 to 10% by weight of at least one polymer phase (B) comprising at least one polymer containing at least 90 mol % of units derived from at least one .alpha.-olefin having from 3 to 12 carbon atoms, and at most 10 mol % of units derived from ethylene, the said compositions having a measured limiting viscosity of between 1.5 and 100 times their limiting viscosity calculated from the distribution of the molecular masses. The process for preparing them consists in modifying a polymer (A) containing at least 80 mol % of units derived from ethylene and at most 20 mol % of units derived from at least one .alpha.-olefin having from 3 to 12 carbon atoms, by means of at least one free-radical initiator brought into contact with the said polymer (A) at a temperature above the melting point of the said polymer (A) for a time longer than or equal to one tenth of the half-life of the said initiator at the temper…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.