Sulfur or peroxy cured epoxidized diene rubbers
AssigneePhillips Petroleum Company
InventorsHenry L. Hsieh, Kishore Udipi
Life of this patent
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Abstract
Sulfur or peroxy cured compositions prepared from epoxidized diene rubbers.
Claims25
A curable rubbery tread composition, exhibiting wet skid resistance when cured, consisting of rubber, filler, extender oil, and a sulfur or peroxy curing system, wherein said rubber is an epoxidized conjugated diene rubber exhibiting a molecular weight in the range of about 50,000 to 500,000 and an extent of epoxidation of about 5 to 95 percent of olefinically unsaturated sites in the conjugated diene rubber prior to curing.
A tire tread stock exhibiting wet skid resistance when cured, consisting of about 100 parts by weight of a rubber, about 40 to 120 parts by weight filler, about 5 to 80 parts by weight extender oil, and a sulfur-based curing system,
- wherein said rubber consists of at least one conjugated diene rubber exhibiting, prior to curing, a molecular weight in the range of about 50,000 to 500,000, an average extent of epoxidation in the range of about 5 to 95 percent of olefinically unsaturated sites in the conjugated diene rubber, and is a homopolymer or copolymer of a conjugated diene alone or with a monovinylarene.
A tread stock, exhibiting wet skid resistance when cured, consisting of about 100 parts by weight of a rubber, about 40 to 120 parts by weight carbon black, about 5 to 80 parts by weight extender oil, a sulfur-based curing system, optionally a pigment,
- wherein said rubber is a conjugated diene rubbery exhibiting, prior to curing, a molecular weight in the range of about 50,000 to 500,000, an average extent of epoxidation in the range of about 5 to 95 percent of olefinically unsaturated sites in the conjugated diene rubber.
A tire tread stock, exhibiting wet skid resistance when cured, consisting of:
- ______________________________________ polymer 100 parts by weight carbon black 40-120 parts by weight extender oil 5-80 parts by weight sulfur 1-3 parts by weight activator 1-8 parts by weight accelerator 0.5-1.5 parts by weight secondary accelerator 0-0.5 parts by weight antioxidant/antiozonant 1-3 parts by weight processing aids 0-5 parts by weight ______________________________________
- wherein said polymer consists of conjugated diene rubber exhibiting, prior to curing, a molecular weight in the range of about 50,000 to 500,000, an average extent of epoxidation in the range of about 5 to 95 percent of olefinically unsaturated sites in the conjugated diene rubber, and which is a homopolymer of a conjugated diene or a copolymer of a conjugated diene with a monovinylarene;
- wherein said activator is selected from the group consisting of stearic acid, zinc stearate, and mixtures thereof;
- said accelerator is selected from the group consisting of 2-mercaptobenzothiazole, and N-cyclohexyl-2-benzothiazoylsulfenamide;
- said secondary accelerator were employed is selected from the group consisting of diphenylguanidine and tetramethylthiuramdisulfide;
- said antioxidant/antiozonant is selected from the group consisting of phenyl-.beta.-naphthylamine, diarylamineketone reaction product, N,N'-diphenyl-p-phenylenediamine, alkylated phenols, and phosphites;
- and
- said processing aids were employed are selected from waxes.
Dependencies are inferred from the claim text.