Rubber compositions including a functionalized wax

Patent metadata

Field	Value
Publication number	US-9309372-B2
Application number	US-201313782731-A
Country	US
Kind code	B2
Filing date	Mar 1, 2013
Priority date	Mar 1, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

Disclosed herein are rubber compositions suitable for use in tire treads comprising (a) at least one conjugated diene polymer or copolymer; (b) at least one filler; (c) a curative package; and (d) at least one of: (i) from 0.2 to 10 phr of at least one halogenated hydrocarbon wax, or (ii) from 0.2 to 10 phr of at least one silicone-containing wax comprising a functionalized polyalkylsiloxane, a functionalized polyalkylsilsesquioxane resin, or combinations thereof. In certain embodiments, the at least one halogenated hydrocarbon wax is a chlorinated hydrocarbon or a fluorinated hydrocarbon wax.

First claim

What is claimed is:

1. A tire comprising a tire tread, the tire tread prepared from a rubber composition comprising:
(a) at least one conjugated diene-containing polymer or copolymer comprising at least one conjugated diene monomer and optionally at least one vinyl-containing monomer;
(b) at least one filler in an amount of 30 to 100 phr wherein at least a majority of the filler is carbon black, silica, or a combination thereof;
(c) a curative package; and
(d) from 0.2 to 10 phr of at least one halogenated hydrocarbon wax.

2. The tire of claim 1 , wherein the at least one halogenated hydrocarbon wax of (d) comprises at least one fluorinated hydrocarbon wax in an amount of 0.5 to 5 phr.

3. The tire of claim 1 , wherein the at least one halogenated hydrocarbon wax of (d) comprises at least one chlorinated hydrocarbon wax in an amount of 0.5 to 5 phr.

4. The tire of claim 1 , wherein the at least one halogenated hydrocarbon wax of (d) comprises at least one fluorinated hydrocarbon wax comprising 0.2% to 70% by weight fluorine based on the total weight of the wax.

5. The tire of claim 1 , wherein the at least one halogenated hydrocarbon wax of (d) comprises a fluorinated paraffin wax.

6. The tire of claim 1 , wherein the at least one halogenated hydrocarbon wax of (d) is at least one fluorinated hydrocarbon wax that is solid at temperatures from 20 ° C. to 25° C.

7. The tire of claim 1 , wherein the at least one halogenated hydrocarbon wax of (d) is at least one chlorinated hydrocarbon wax comprising 35% to 75% by weight chlorine based on the total weight of the wax.

8. The tire of claim 1 , wherein the at least one halogenated hydrocarbon wax of (d) comprises a chlorinated paraffin wax.

9. The tire of claim 1 , wherein the at least one halogenated hydrocarbon wax of (d) comprises a chlorinated hydrocarbon wax that is solid at temperatures from 20° C. to 25° C.

10. The tire of claim 1 , wherein the at least one halogenated hydrocarbon wax of (d) comprises a fluorinated hydrocarbon wax that is solid at temperatures from 20° C. to 25° C.

11. The tire of claim 2 , wherein the rubber composition further comprises a conventional wax selected from the group consisting of a microcrystalline wax, a paraffin wax, and combinations thereof.

12. The tire of claim 1 , wherein the at least one conjugated diene polymer or copolymer is derived from a conjugated diene monomer selected from the group consisting of 1,3-butadiene, isoprene, 1,3-pentadiene, 1,3-hexadiene, 2,3-dimethyl-1,3-butadiene, 2-ethyl-1,3-butadiene, 2-methyl-1,3-pentadiene, 3-methyl-1,3-pentadiene, 4-methyl-1,3-pentadiene, 2,4-hexadiene, optionally in combination with a vinyl aromatic monomer selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene, o-methylstyrene, p-butylstyrene, vinylnaphthalene, and combinations thereof.

13. The tire of claim 1 , wherein the at least one filler further comprises clay, metal oxide, and combinations thereof.

14. The tire of claim 1 , wherein the at least one conjugated diene-containing polymer or copolymer comprising at least one conjugated diene monomer and optionally at least one vinyl-containing monomer is selected from the group consisting of polybutadiene, styrene-butadiene copolymer, polyisoprene, natural rubber, and combinations thereof.

15. The tire of claim 1 , wherein a rubber formed from the rubber composition exhibits an adjusted surface hydrophobicity or hydrophilicity as measured by a contact angle with water different from that of a rubber formed from a comparative composition, wherein the comparative composition is the same as the composition of any one of claims 1 - 2 , 3 except that the comparative composition contains a conventional wax instead of (d) and the conventional wax is present in the same amount as (d).

16. The tire of claim 1 , wherein (d) is selected from the group consisting of chlorinated hydrocarbon wax, brominated hydrocarbon wax, iodated hydrocarbon wax, fluorinated hydrocarbon wax, and combinations thereof.

17. The tire of claim 1 , wherein the 0.2 to 10 phr of at least one halogenated wax is selected from the group consisting of chlorinated hydrocarbon wax that is solid at temperatures from 20° C. to 25° C., brominated hydrocarbon wax, iodated hydrocarbon wax, fluorinated hydrocarbon wax, and combinations thereof.

Assignees

• Pan Xiao-Dong
• Chen Yaohong
• Rackaitis Mindaugas
• Ulmer James D
• Capitos-Davis Nicole
• Bridgestone Corp

Inventors

• Pan Xiao-Dong
• Chen Yaohong
• Rackaitis Mindaugas
• Ulmer James D
• Capitos-Davis Nicole

Classifications

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08L91/06

  Waxes · CPC title

• C08L9/00 Primary

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08K5/0025

  Crosslinking or vulcanising agents; including accelerators · CPC title

• C08L21/00

  Compositions of unspecified rubbers · CPC title