Silica-filled rubber compositions containing dialkyleneamide polysulfides

Claim 3

The method of claim 1 wherein said dialkyleneamide polysulfide is added in an amount ranging from 0.10 to 5.0 phr.

Claim 4

The method of claim 1 wherein said dialkyleneamide polysulfide is of the formula: ##STR8## where R 1 is independently selected from alkylene groups having from 1 to 18 carbon atoms and x is an integer ranging from 2 to 7.

Claim 5

The method of claim 3 wherein said dialkyleneamide polysulfide is selected from the group consisting of bis-(propionamide) disulfide, bis-(butyramide) disulfide, bis-(pentanamide) disulfide, bis-(hexanamide) disulfide, bis-(heptanamide) disulfide, bis-(octanamide) disulfide, bis-(nonanamide) disulfide, bis-(decanamide) disulfide, bis-(undecanamide) disulfide, bis-(dodecanamide) disulfide, bis-(tridecanamide) disulfide, bis-(tetradecanamide) disulfide, bis-(pentadecanamide) disulfide, bis-(hexadecanamide) disulfide, bis-(heptadecanamide) disulfide, bis-(octadecanamide) disulfide, bis-(propionamide) trisulfide, bis-(butyramide) trisulfide, bis-(pentanamide) trisulfide, bis-(hexanamide) trisulfide, bis-(heptanamide) trisulfide, bis-(octanamide) trisulfide, bis-(nonanamide) trisulfide, bis-(decanamide) trisulfide, bis-(undecanamide) trisulfide, bis-(dodecanamide) trisulfide, bis-(tridecanamide) trisulfide, bis-(tetradecanamide) trisulfide, bis-(pentadecanamide) trisulfide, bis-(hexadecanamide) trisulfide, bis-(heptadecanamide) trisulfide, bis-(octadecanamide) trisulfide, bis-(propionamide) tetrasulfide, bis-(butyramide) tetrasulfide, bis-(pentanamide) tetrasulfide, bis-(hexanamide) tetrasulfide, bis-(heptanamide) tetrasulfide, bis-(octanamide) tetrasulfide, bis-(nonanamide) tetrasulfide, bis-(decanamide) tetrasulfide, bis-(undecanamide) tetrasulfide, bis-(dodecanamide) tetrasulfide, bis-(tridecanamide) tetrasulfide, bis-(tetradecanamide) tetrasulfide, bis-(pentadecanamide) tetrasulfide, bis-(hexadecanamide) tetrasulfide, bis-(heptadecanamide) tetrasulfide, bis-(octadecanamide) tetrasulfide, bis-(propionamide) pentasulfide, bis-(butyramide) pentasulfide, bis-(pentanamide) pentasulfide, bis-(hexanamide) pentasulfide, bis-(heptanamide) pentasulfide, bis-(octanamide) tetrasulfide, bis-(nonanamide) pentasulfide, bis-(decanamide) pentasulfide, bis-(undecanamide) pentasulfide, bis-(dodecanamide) pentasulfide, bis-(tridecanamide) pentasulfide, bis-(tetradecanamide) pentasulfide, bis-(pentadecanamide) pentasulfide, bis-(hexadecanamide) pentasulfide, bis-(heptadecanamide) pentasulfide, bis-(octadecanamide) pentasulfide, bis-(propionamide) hexasulfide, bis-(butyramide) hexasulfide, bis-(pentanamide) hexasulfide, bis-(hexanamide) hexasulfide, bis-(heptanamide) hexasulfide, bis-(octanamide) hexasulfide, bis-(nonanamide) hexasulfide, bis-(decanamide) hexasulfide, bis-(undecanamide) hexasulfide, bis-(dodecanamide) hexasulfide, bis-(tridecanamide) hexasulfide, bis-(tetradecanamide) hexasulfide, bis-(pentadecanamide) hexasulfide, bis-(hexadecanamide) hexasulfide, bis-(heptadecanamide) hexasulfide, bis-(octadecanamide) hexasulfide, bis-(propionamide) heptasulfide, bis-(butyramide) heptasulfide, bis-(pentanamide) heptasulfide, bis-(hexanamide) heptasulfide, bis-(heptanamide) heptasulfide, bis-(octanamide) heptasulfide, bis-(nonanamide) heptasulfide, bis-(decanamide) heptasulfide, bis-(undecanamide) heptasulfide, bis-(dodecanamide) heptasulfide, bis-(tridecanamide) heptasulfide, bis-(tetradecanamide) heptasulfide, bis-(pentadecanamide) heptasulfide, bis-(hexadecanamide) heptasulfide, bis-(heptadecanamide) heptasulfide and bis-(octadecanamide) heptasulfide.

Claim 6

The method of claim 1 wherein a sulfur containing organosilicon compound is present and is of the formula: Z--Alk--S.sub.n --Alk--Z in which Z is selected from the group consisting of ##STR9## where R 2 is an alkyl group of 1 to 4 carbon atoms, cyclohexyl or phenyl; R 3 is alkoxy of 1 to 8 carbon atoms, or cycloalkoxy of 5 to 8 carbon atoms; Alk is a divalent hydrocarbon of 1 to 18 carbon atoms and n is an integer of 2 to 8.

Claim 7

The method of claim 5 wherein sulfur containing organosilicon compound is present in an amount ranging from 0.01 to 1.0 parts by weight per part by weight of the silica.

Claim 8

The method of claim 1 wherein a silica filler is added to said vulcanizable rubber composition in an amount ranging from 15 to 80 phr.

Claim 9

The method of claim 1 wherein said sulfur vulcanizable elastomer containing olefinic unsaturation is selected from the group consisting of natural rubber, neoprene, polyisoprene, butyl rubber, polybutadiene, styrene-butadiene copolymer, styrene/isoprene/butadiene rubber, methyl methacrylate-butadiene copolymer, isoprene-styrene copolymer, methyl methacrylate-isoprene copolymer, acrylonitrile-isoprene copolymer, acrylonitrile-butadiene copolymer, EPDM and mixtures thereof.

Claim 10

The method of claim 1 wherein said silica-filled rubber composition is thermomechanically mixed at a rubber temperature in a range of from 140° C. to 190° C. for a mixing time of from 1 to 20 minutes.

Claim 11

A sulfur vulcanizable rubber composition comprising an elastomer containing olefinic unsaturation, silica and a dialkyleneamide polysulfide.

Claim 12

A sulfur vulcanizable rubber composition comprising an elastomer containing olefinic unsaturation, silica and a dialkyleneamide polysulfide.

Claim 13

The composition of claim 10 wherein said dialkyleneamide polysulfide is present in an amount ranging from 0.05 to 10.0 phr.

Claim 14

The composition of claim 10 wherein said dialkyleneamide polysulfide is of the formula: ##STR10## where R 1 is independently selected from alkylene groups having from 1 to 18 carbon atoms and x is an integer ranging from 2 to 7.

Claim 15

The composition of claim 10 wherein said dialkyleneamide polysulfide is selected from the group consisting of bis-(propionamide) disulfide, bis-(butyramide) disulfide, bis-(pentanamide) disulfide, bis-(hexanamide) disulfide, bis-(heptanamide) disulfide, bis-(octanamide) disulfide, bis-(nonanamide) disulfide, bis-(decanamide) disulfide, bis-(undecanamide) disulfide, bis-(dodecanamide) disulfide, bis-(tridecanamide) disulfide, bis-(tetradecanamide) disulfide, bis-(pentadecanamide) disulfide, bis-(hexadecanamide) disulfide, bis-(heptadecanamide) disulfide, bis-(octadecanamide) disulfide, bis-(propionamide) trisulfide, bis-(butyramide) trisulfide, bis-(pentanamide) trisulfide, bis-(hexanamide) trisulfide, bis-(heptanamide) trisulfide, bis-(octanamide) trisulfide, bis-(nonanamide) trisulfide, bis-(decanamide) trisulfide, bis-(undecanamide) trisulfide, bis-(dodecanamide) trisulfide, bis-(tridecanamide) trisulfide, bis-(tetradecanamide) trisulfide, bis-(pentadecanamide) trisulfide, bis-(hexadecanamide) trisulfide, bis-(heptadecanamide) trisulfide, bis-(octadecanamide) trisulfide, bis-(propionamide) tetrasulfide, bis-(butyramide) tetrasulfide, bis-(pentanamide) tetrasulfide, bis-(hexanamide) tetrasulfide, bis-(heptanamide) tetrasulfide, bis-(octanamide) tetrasulfide, bis-(nonanamide) tetrasulfide, bis-(decanamide) tetrasulfide, bis-(undecanamide) tetrasulfide, bis-(dodecanamide) tetrasulfide, bis-(tridecanamide) tetrasulfide, bis-(tetradecanamide) tetrasulfide, bis-(pentadecanamide) tetrasulfide, bis-(hexadecanamide) tetrasulfide, bis-(heptadecanamide) tetrasulfide, bis-(octadecanamide) tetrasulfide, bis-(propionamide) pentasulfide, bis-(butyramide) pentasulfide, bis-(pentanamide) pentasulfide, bis-(hexanamide) pentasulfide, bis-(heptanamide) pentasulfide, bis-(octanamide) tetrasulfide, bis-(nonanamide) pentasulfide, bis-(decanamide) pentasulfide, bis-(undecanamide) pentasulfide, bis-(dodecanamide) pentasulfide, bis-(tridecanamide) pentasulfide, bis-(tetradecanamide) pentasulfide, bis-(pentadecanamide) pentasulfide, bis-(hexadecanamide) pentasulfide, bis-(heptadecanamide) pentasulfide, bis-(octadecanamide) pentasulfide, bis-(propionamide) hexasulfide, bis-(butyramide) hexasulfide, bis-(pentanamide) hexasulfide, bis-(hexanamide) hexasulfide, bis-(heptanamide) hexasulfide, bis-(octanamide) hexasulfide, bis-(nonanamide) hexasulfide, bis-(decanamide) hexasulfide, bis-(undecanamide) hexasulfide, bis-(dodecanamide) hexasulfide, bis-(tridecanamide) hexasulfide, bis-(tetradecanamide) hexasulfide, bis-(pentadecanamide) hexasulfide, bis-(hexadecanamide) hexasulfide, bis-(heptadecanamide) hexasulfide, bis-(octadecanamide) hexasulfide, bis-(propionamide) heptasulfide, bis-(butyramide) heptasulfide, bis-(pentanamide) heptasulfide, bis-(hexanamide) heptasulfide, bis-(heptanamide) heptasulfide, bis-(octanamide) heptasulfide, bis-(nonanamide) heptasulfide, bis-(decanamide) heptasulfide, bis-(undecanamide) heptasulfide, bis-(dodecanamide) heptasulfide, bis-(tridecanamide) heptasulfide, bis-(tetradecanamide) heptasulfide, bis-(pentadecanamide) heptasulfide, bis-(hexadecanamide) heptasulfide, bis-(heptadecanamide) heptasulfide and bis-(octadecanamide) heptasulfide.

Claim 16

The composition of claim 10 wherein a sulfur containing organosilicon compound is present and is of the formula: Z--Alk--S.sub.n --Alk--Z in which Z is selected from the group consisting of ##STR11## where R 2 is an alkyl group of 1 to 4 carbon atoms, cyclohexyl or phenyl; R 3 is alkoxy of 1 to 8 carbon atoms, or cycloalkoxy of 5 to 8 carbon atoms; Alk is a divalent hydrocarbon of 1 to 18 carbon atoms and n is an integer of 2 to 8.

Claim 17

The composition of claim 14 wherein sulfur containing organosilicon compound is present in an amount ranging from 0.01 to 1.0 parts by weight per part by weight of said silica.

Claim 18

The composition of claim 9 wherein said silica is present in an amount ranging from 10 to 250 phr.

Claim 19

The composition of claim 16 wherein a silica filler is used in an amount ranging from 15 to 80 phr.

Claim 20

The composition of claim 10 wherein said elastomer containing olefinic unsaturation is selected from the group consisting of natural rubber, neoprene, polyisoprene, butyl rubber, polybutadiene, styrene-butadiene copolymer, styrene/isoprene/butadiene rubber, methyl methacrylate-butadiene copolymer, isoprene-styrene copolymer, methyl methacrylate-isoprene copolymer, acrylonitrile-isoprene copolymer, acrylonitrile-butadiene copolymer, EPDM and mixtures thereof.

Claim 21

The composition of claim 10 wherein said composition is thermomechanically mixed at a rubber temperature in a range of from 140° C. to 190° C. for a total mixing time of from 1 to 20 minutes.

Claim 22

A sulfur vulcanized rubber composition which is prepared by heating the composition of claim 10 to a temperature ranging from 100° C. to 200° C. in the presence of a sulfur vulcanizing agent.

Claim 23

The sulfur vulcanized rubber composition of claim 20 in the form of a tire, belt or hose.

Claim 24

A tire having a tread comprised of the composition of claim 20.