Process for making dynamically-loaded articles comprising propylene-based elastomers, composition for use in such processes, and article made using such processes
US7863364B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2006 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | Sep 2, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2312/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a process for making an article subject to dynamic loading, the process comprises: (i) shaping a polymer-containing composition in the green state, the composition comprising (a) a continuous phase of a polymeric component of at least 15 wt %, based on the total weight of the polymer component of a propylene elastomer having a heat of fusion of less than 70 J/g and an isotactic triad tacticity of 50 to 99% and optionally containing units derived from a diene, the polymeric component having a density of less than 0.9 g/cm3 and (b) from 20 to 120 phr, preferably 30 to 100 phr, most preferably 40 to 90 phr based on the total weight of the polymer component of a reinforcing filler component; and (c) a peroxide curative. The composition is combined with a fibrous reinforcement which is then cured to a cure state as determined by ODR @ 170° C., 30 min MH-ML of from 5 to 80 dNm. The invention especially relates to such processes when providing under Demattia testing conditions a crack length of less than 15 mm at room temperature over 90K cycles, preferably 10 mm, more preferably 7 mm, and most preferably 4 mm, and a 10% modulus of 0.7 to 10 MPa, preferably 1.4 to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.