Curable low sulfur liquid rubber compositions
AssigneeFina Technology, Inc.
InventorsOlivier Defrain, Olivier Klein
Life of this patent
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Abstract
A curable low sulfur liquid rubber composition including at least one polymer which contains, in polymerized form, at least one monomer having a carbon chain of four and a peroxide system which includes at least one organic peroxide and at least one coagent. The polymer has a vinyl content of 1% to 90% and a number average molecular weight of 800 g/mol to 70,000 g/mol. The curable low sulfur liquid rubber composition has a sulfur content of 0 to 1%, by weight, and is curable at a temperature of 100° C. to 190° C.
Claims22
A heat curable low sulfur liquid rubber composition, the composition comprising:
- a) at least one liquid polyene comprising, as polymerized units, at least one comonomer having a carbon chain of at least four, the at least one liquid polyene having a vinyl content of between 1 molar percent and 90 molar percent and a number average molecular weight of 800 g/mol to 70,000 g/mol;
- b) at least one organic peroxide;
- c) at least one coagent other than sulfur or a sulfur compound, adapted for crosslinking;
- d) less than 1% by weight of sulfur;
- wherein the ratio of coagent phr to organic peroxide phr is less than 3.0:1;
- and wherein, after curing, the cured rubber composition has:
- i. a loss factor (tan δ) greater than 0.4 when measured at 50 Hz frequency, 3 μm amplitude, and temperatures between −80° C. and 80° C.;
- and
- ii. a swelling ratio from 40% to 170% by weight, as measured by equilibrium weight gain in toluene at 25° C.
A cured rubber composition which is a cured reaction product of a heat curable low sulfur liquid rubber composition comprising:
- a) at least one liquid polyene comprising, as polymerized units, at least one comonomer having a carbon chain of at least four, the at least one polyene having a vinyl content of between 1 molar percent and 90 molar percent and a number average molecular weight of 800 g/mol to 70,000 g/mol;
- b) at least one organic peroxide;
- c) at least one coagent other than sulfur or a sulfur compound, adapted for crosslinking;
- d) 0 to less than 1% by weight of sulfur;
- wherein the ratio of coagent phr to organic peroxide phr is less than 3.0:1;
- and wherein, after curing, the cured rubber composition has:
- i. a loss factor (tan δ) greater than 0.4 when measured at 50 Hz frequency, 3 μm amplitude, and temperatures between −10° C. and 45° C.;
- and
- ii. a swelling ratio from 40% to 170% by weight, as measured by equilibrium weight gain in toluene at 25° C.
A method of producing a cured low sulfur rubber composition, the method comprising the steps of:
- A. preparing a heat curable low sulfur liquid rubber composition by combining at least:
- a) at least one liquid polyene comprising, as polymerized units, at least one comonomer having a carbon chain of at least four, the at least one liquid polyene having a vinyl content of between 1 molar percent and 90 molar percent and a number average molecular weight of 800 g/mol to 70,000 g/mol;
- b) at least one organic peroxide;
- c) at least one coagent other than sulfur or a sulfur compound, adapted for crosslinking;
- d) 0 to less than 1% by weight of sulfur;
- wherein the ratio of coagent phr to organic peroxide phr is less than 3.0:1;
- and
- B. heating the heat curable low sulfur liquid rubber composition at a temperature between 100° C. and 190° C. for between 5 minutes and 10 hours;
- to obtain a cured low sulfur rubber composition having:
- i. a loss factor (tan δ) greater than 0.4 when measured at 50 Hz frequency, 3 μm amplitude, and temperatures between −30° C. and 45° C.;
- and
- ii. a swelling ratio from 40% to 170% by weight, as measured by equilibrium weight gain in toluene at 25° C.
Dependencies are inferred from the claim text.