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AssigneeExxonMobil Chemical Patents Inc.
InventorsAlistair Duncan Westwood, Abdelhadi Sahnoune
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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 9 MPa and most preferably 2 to 8 MPa.
A process for making an article for subjecting to dynamic loading comprising:
A polymer composition for use in the manufacture of an belt, the composition comprising:
A belt subjectable to dynamic loading produced by the process of (i) combining an uncured polymer-based composition and a reinforcement, the polymer-based 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, an isotactic triad tacticity of 50 to 99% and optionally containing units derived from a diene and an MFR of from 0.5 to 50 g/10 min, the polymeric component having a density of less than 0.9 and (b) from 20 to 120 phr, based on the total weight of the polymeric component, of a reinforcing filler component;
Dependencies are inferred from the claim text.