Title:
IMPROVED ELECTRICAL CONDUCTIVITY OF SILICA-FILLED RUBBER COMPOSITIONS
Document Type and Number:
WIPO Patent Application WO/2000/068027
Kind Code:
A2
Abstract:
A tire tread composition comprising 100 parts by weight of a vulcanizable elastomer suitable for use in a tire; from about 1 to about 100 parts by weight of a silica reinforcing filler, per 100 parts of the elastomer; and from about 0.1 to 15 parts by weight of an electrically conductive additive containing a poly(alkylene oxide)-containing polymer having an alkali metal salt dissolved therein, per 100 parts of the elastomer provides improved electrical conductivity properties. A pneumatic tire having improved electrostatic dissipation employing the tire tread composition described above and a related method for dissipating electrostatic charges from tires using the tread composition is also discussed.
Inventors:
HOGAN TERRENCE E (US)
HERGENROTHER WILLIAM L (US)
DE TRANO MARIO N (US)
HERGENROTHER WILLIAM L (US)
DE TRANO MARIO N (US)
Application Number:
PCT/US2000/012301
Publication Date:
November 16, 2000
Filing Date:
May 05, 2000
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
HOGAN TERRENCE E (US)
HERGENROTHER WILLIAM L (US)
TRANO MARIO N DE (US)
HOGAN TERRENCE E (US)
HERGENROTHER WILLIAM L (US)
TRANO MARIO N DE (US)
International Classes:
B60C1/00; B60C19/08; C08K3/04; C08K3/08; C08K3/36; C08L21/00; (IPC1-7): B60C1/00
Foreign References:
| DE19726728A1 | 1999-01-07 | |||
| EP0909785A2 | 1999-04-21 | |||
| US5714533A | 1998-02-03 |
Attorney, Agent or Firm:
Hornickel, John H. (Inc. 1200 Firestone Parkway Akron, OH, US)
Albrecht, Thomas (Kraus & Weisert Thomas-Wimmer-Ring 15 München, DE)
Albrecht, Thomas (Kraus & Weisert Thomas-Wimmer-Ring 15 München, DE)
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Claims:
What is claimed is:
| 1. | A tire tread composition having improved electrical conductivity properties comprising: 100 parts by weight of a vulcanizable elastomer suitable for use in a tire; from about 1 to about 100 parts by weight of a silica reinforcing filler, per 100 parts of said elastomer; and from about 0.1 to about 15 parts by weight of an electrically conductive additive containing a poly (alkylene oxide)containing polymer having an alkali metal salt dissolved in said polymer, per 100 parts of said elastomer. |
| 2. | The tire tread composition, as set forth in claim 1, further comprising from about 1 to about 80 parts by weight carbon black. |
| 3. | The tire tread composition, as set forth in claim 1 or claim 2, wherein said elastomer includes a diene monomer, homopolymer or a copolymer or terpolymer of a diene monomer and a monomer selected from the group consisting of a monovinyl aromatic monomer and a triene monomer. |
| 4. | The tire tread composition, as set forth in claim 1, wherein said composition includes natural rubber. |
| 5. | The tire tread composition, as set forth in any of claims 14, wherein said electrically conductive additive is selected from the group consisting of comb polymers having poly (alkylene oxide) side chains, said polymers having an alkali metal salt dissolved in. |
| 6. | The tire tread composition, as set forth in any of claims 15, wherein said poly (alkylene oxide)containing polymer is a vinyl endcapped poly (alkylene oxide) copolymer or a grafted polymer containing poly (alkylene oxide). |
| 7. | The tire tread composition, as set forth in claim 6, wherein said grafted polymer includes the reaction product of a poly (alkylene oxide) containing polymer selected from the group consisting of monohydroxy poly (alkylene oxide) polymers and aziridine endcapped poly (alkylene oxide) polymers and a maleic anhydridecontaining polymer. |
| 8. | The tire tread composition, as set forth in claim 7, wherein said monohydroxy poly (alkylene oxide) polymers are selected from the group consisting of poly (ethylene oxide), poly (propylene oxide), poly (tetrahydrofuran) and block and random copolymers thereof, and aliphatic and aromatic ether derivatives and fatty acid ester derivatives thereof. |
| 9. | The tire tread composition, as set forth in any of claims 18, wherein said alkali metal salt is a lithium salt. |
| 10. | The tire tread composition, as set forth in any of claims 19, wherein said electrically conductive additive is selected from the group consisting of poly (methylvinyl etheraltmaleic anhydride)gpoly (ethylene glycol) methyl ether/lithium tetraflouroborate and poly (methylvinyl ether altmaleic anhydride)gpoly (ethylene glycol) methyl ether/lithium chloride. |
| 11. | A tire having improved electrostatic dissipation employing a tire tread composition of any of claims 110. |
| 12. | A method of dissipating electrostatic charge from tires comprising the step of : applying to the tire carcass prior to curing, a composite tread, said tread providing a tread pattern and having a road engaging surface, said composite tread comprising a tire tread composition of any of claims 110. |
Description:
INTERNATIONAL SEARCH REPORT Inter nai Apphcatlon No ..on patent family members PCT/US 00/12301 PCT/US 00/12301 Patent document Publication Patent family Publication cited in search report date member (s) date DE 19726728 A 07-01-1999 NONE EP 0909785 A 21-04-1999 CA 2249892 A 16-04-1999 JP 11236484 A 31-08-1999 US 5714533 A 03-02-1998 IT T0940812 A 11-04-1996 DE 69514324 D 10-02-2000 DE 69514324 T 27-07-2000 EP 0733673 A 25-09-1996 ES 2141958 T 01-04-2000 WO 9531888 A 30-11-1995