Silica reinforced rubber composition and tire with tread
AssigneeThe Goodyear Tire & Rubber Company
InventorsMartin Paul Cohen, John Pennington Lawrence, Cheryl Ann Losey
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Abstract
The present invention relates to a silica reinforced rubber composition and to pneumatic tires having treads comprised of the silica reinforced rubber compositions. The silica reinforced rubber composition comprises at least one elastomer, silica, a silica coupler, a silylating agent and, optionally, carbon black.
Claims44
A rubber composition comprised of (A) 100 parts by weight of at least one diene-based elastomer, (B) about 50 to about 100 phr of particulate reinforcing filler composed of silica and optionally carbon black, composed of about 60 to about 100 phr of precipitated silica and correspondingly zero to about 10 phr of carbon black, wherein the weight ratio of silica to carbon black, if carbon black is used, is at least about 6/1, (C) at least one silica coupler having a moiety reactive with said silica and another moiety interactive with said elastomer(s), and (D) about 0.5 to about 10 phr of silica-reactive, trialkylsilyl functional group-containing silylating agent wherein the molar ratio based on silane functionality of the silylating agent to silica coupler is in a range of about 0.1/1 to 4/1;
- wherein said silylating agent has the formula:
- R.sub.1 R.sub.2 R.sub.3 Si--X
- where X is a radical selected from at least one of the group consisting of:
- (1) halogen radical selected from one of chlorine, bromine and iodine,
- (2) --NH--C.dbd.OR.sub.1,
- (3) --NR.sub.4 --A,
- (4) --NH--C.dbd.ONH--A, and
- (5) --N(R.sub.4).sub.2
- wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are radicals individually selected from the group consisting of primary, secondary and tertiary alkyl radicals and alkaryl radicals having from 1 to 30 carbon atoms and wherein A is --SiR.sub.1 R.sub.2 R.sub.3.
A rubber composition comprised of (A) 100 parts by weight of at least one diene based one diene-based elastomer, (B) about 60 to about 90, phr particulate reinforcing filler composed of silica and optionally carbon black, composed of about 60 to about 90 phr of precipitated silica and about 3 to about 7 phr of carbon black, wherein the weight ratio of silica to carbon black is at least about 6/1, (C) at least one silica coupler having a moiety reactive with said silica and another moiety interactive with said elastomer(s), and (D) about 0.5 to about 10 phr of silica-reactive, trialkylsilyl functional group-containing silylating agent wherein the molar ratio based on silane functionality of the agent has the formula:
- R.sub.1 R.sub.2 R.sub.3 Si--X
- where X is a radical selected from at least one of the group consisting of:
- (1) halogen radical selected from one of chlorine, bromine and iodine,
- (2) --NH--C.dbd.OR.sub.1,
- (3) --NR.sub.4 --A,
- (4) --NH--C.dbd.ONH--A, and
- (5) --N(R.sub.4).sub.2
- wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are radicals individually selected from the group consisting of primary, secondary and tertiary alkyl radicals and alkaryl radicals having from 1 to about 3 carbon atoms, and wherein A is --SiR.sub.1 R.sub.2 R.sub.3.
A rubber composition comprised of (A) 100 parts by weight of at least one diene based one diene-based elastomer, (B) about 60 to about 90, phr particulate reinforcing filler composed of silica and optionally carbon black, composed of about 60 to about 90 phr of precipitated silica and about 3 to about 7 phr of carbon black, wherein the weight ratio of silica to carbon black is at least about 6/1, (C) at least one silica coupler having a moiety reactive with said silica and another moiety interactive with said elastomer(s), and (D) about 0.5 to about 10 phr of silica-reactive, trialkylsilyl functional group-containing silylating agent wherein the molar ratio based on silane functionality of the silylating agent to silica coupler is in a range of about 0.1/1 to 4/1;
- wherein said silylating agent has the formula:
- R.sub.1 R.sub.2 R.sub.3 Si--X
- where X is a radical selected from at least one of the group consisting of:
- (1) halogen radical selected from one of chlorine, bromine and iodine,
- (2) --NH--C.dbd.OR.sub.1,
- (3) --NR.sub.4 --A,
- (4) --NH--C.dbd.ONH--A, and
- (5) --N(R.sub.4).sub.2
- wherein R.sub.1, R.sub.2, R.sub.3 are radicals individually selected from the group consisting of primary, secondary and tertiary alkyl radicals and alkaryl radicals having from 1 to 3 carbon atoms, where R.sub.4 is hydrogen, and wherein A is --SiR.sub.1 R.sub.2 R.sub.3.
Dependencies are inferred from the claim text.