Coupling agent for elastomeric composition comprising a reinforcing filler
View Patent ↗A method of decreasing the roiling resistance of a tire formed from a sulfur-vulcanized elastomeric by combining at least one diene elastomer and at least one reinforcing filler, with an effective amount of a coupling agent consisting of a combination of: 10 to 90%, of a product (I) consisting of a blend of poly(alkylphenol) polysulfides of formula: in which: R is an alkyl radical containing 1 to 20 carbon atoms; n and n′ are two integers, which may be identical or different, from 1 to 8; p is an integer from 0 to 50; and 10 to 90% of a product (II) consisting of bis(triethoxysilylpropyl)tetrasulfide, to form a mixture; thereafter working said mixture; and thereafter heating said mixture to vulcanize said mixture. 90% of bis(triethoxysilylpropyl)tetrasulfide.
1. A method of decreasing the rolling resistance of a tire formed from a sulfur-vulcanized elastomeric composition comprising the steps of:
combining at least one diene elastomer selected from the group consisting of polybutadiene and poly(styrene/butadiene) and at least one reinforcing filler, with an effective amount of a coupling agent consisting of a combination of:
50 to 70%, of a product (I) consisting of a blend of poly(alkylphenol) polysulfides of formula:
in which:
R is a tert-butyl or tert-pentyl radical;
n and n′ are two integers, in which the average value of n and of n′ is about 2 and the average value of p is about 5;
and
30 to 50% of a product (II) consisting of bis(triethoxysilylpropyl)tetrasulfide, to form a mixture wherein the weight ration of (I)/(II) is from 1 to 3; thereafter
working said mixture; and thereafter
heating said mixture to vulcanize said mixture.
2. The method of claim 1 , characterized in that a white reinforcing filler is used.
3. The method of claim 2 , characterized in that said white filler is selected from the group consisting of silica, alumina and mixtures thereof.
4. The method of claim 1 , characterized in that it comprises combining:
100 parts by weight of diene elastomer(s):
10 to 200 parts by weight of white reinforcing filler; and
0.5 to 10 parts by weight of coupling agent.
5. The method of claim 1 , characterized in that 50 to 100 parts by weight of silica and 5 to 7 parts by weight of the coupling agent are combined with 100 parts by weight of said one or more diene elastomer.
6. The method of claim 1 , characterized in that standard non-sulfur-containing additives are combined.
7. The method of claim 1 characterized in that the ratio (I)/(II) is about 2.
8. The method of claim 4 wherein between 20 and 150 parts by weight said white reinforcing filler are combined.