Silica-reinforced rubber compounded with an alkoxysilane and a strong organic base
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08G-018/62
C08G-018/00
출원번호
US-0416295
(2006-05-02)
등록번호
US-7271208
(2007-09-18)
발명자
/ 주소
Lin,Chenchy Jeffrey
Hergenrother,William L.
Hogan,Terrence E.
출원인 / 주소
Bridgestone Corporation
인용정보
피인용 횟수 :
3인용 특허 :
9
초록▼
Improved tensile mechanical and dynamic viscoelastic properties of silica-reinforced sulfur vulcanized rubbers can be achieved by compounding elastomers with silica in the presence of an alkoxysilane and a catalytic amount of a strong organic base. The strong organic base acts as a catalyst to accel
Improved tensile mechanical and dynamic viscoelastic properties of silica-reinforced sulfur vulcanized rubbers can be achieved by compounding elastomers with silica in the presence of an alkoxysilane and a catalytic amount of a strong organic base. The strong organic base acts as a catalyst to accelerate the alkoxysilane-silica reaction, especially at high compounding temperatures, resulting in rubber compounds that exhibit reduced compound viscosity, improved dispersion of silica, and reduced filler flocculation after compounding, and reduced hysteresis and improved abrasion resistance in the vulcanized product, compared to similar compounds prepared at the temperature without the strong organic base catalyst.
대표청구항▼
We claim: 1. A sulfur-vulcanizable elastomeric compound, comprising: an elastomer; a reinforcing filler comprising silica or a mixture thereof with carbon black; an alkyl alkoxysilane; a mercaptosilane silica coupling agent, wherein the weight ratio of the mercaptosilane to the alkyl alkoxysilane i
We claim: 1. A sulfur-vulcanizable elastomeric compound, comprising: an elastomer; a reinforcing filler comprising silica or a mixture thereof with carbon black; an alkyl alkoxysilane; a mercaptosilane silica coupling agent, wherein the weight ratio of the mercaptosilane to the alkyl alkoxysilane is a maximum of 0.14:1; a catalytic amount of a strong organic base; and a cure agent comprising an effective amount of sulfur to achieve a satisfactory cure, wherein the elastomer, the silica, the alkyl alkoxysilane, the mercaptosilane and the strong organic base are mixed together, in the absence of the cure agent, at a temperature of about 130째 C. to about 200째 C. 2. The compound of claim 1, wherein the compound exhibits an improved tensile mechanical or dynamic viscoelastic property, selected from the group of properties consisting of about a 1% to about a 10% decrease in Mooney viscosity after compounding, reduced hysteresis as measured by about a 3% to about a 20% decrease in tan σ at 50째 C., about a 3% to about a 20% decrease in filler flocculation after compounding, and combinations thereof, compared to a similar compound mixed at the temperature in the absence of the strong organic base. 3. The compound of claim 1, wherein the strong organic base is selected from the group consisting of a guanidine, a hindered amine base, and mixtures thereof. 4. The compound of claim 3, wherein the guanidine is selected from the group consisting of triphenylguanidine, diphenylguanidine, di-o-tolylguanidine, and mixtures thereof. 5. The compound of claim 4, wherein the guanidine is diphenylguanidine. 6. The compound of claim 3, wherein the hindered amine base is selected from the group consisting of 1,8-diazabicyclo[5.4.0]undec-7-ene; 1,5-diazabicyclo[4.3.0]non-5-ene; and mixtures thereof. 7. The compound of claim 1, wherein the catalytic amount of the strong organic base is about 0.1% to about 10% by weight, based on the weight of the silica. 8. The compound of claim 7, wherein the catalytic amount of the strong organic base about 0.1% to about 5% by weight, based on the weight of the silica. 9. The compound of claim 1, wherein the weight ratio of the mercaptosilane to the alkyl alkoxysilane is about 0.001:1 to about 0.10:1. 10. The compound of claim 1, wherein the weight ratio of the mercaptosilane to the alkyl alkoxysilane is about 0.01:1 to about 0.10:1. 11. The compound of claim 1, wherein the mercaptosilane is present in an amount of about 0.0001% to about 3% by weight, based on the weight of the silica. 12. The compound of claim 1, wherein the mercaptosilane is present in an amount of about 0.001% to about 1.5% by weight, based on the weight of the silica. 13. The compound of claim 1, wherein the mercaptosilane is present in an amount of about 0.01% to about 1% by weight, based on the weight of the silica. 14. The compound of claim 1, wherein the alkyl alkoxysilane is an alkyl trialkoxysilane. 15. The compound of claim 1, further comprising a silica dispersing aid selected from the group consisting of a fatty acid ester of a hydrogenated or non-hydrogenated C5 or C6 sugar, a polyoxyethylene derivative of a fatty acid ester of a hydrogenated or non-hydrogenated C5 or C6 sugar, an ester of a polyol, and mixtures thereof. 16. The compound of claim 15, wherein the fatty acid ester is selected from the group consisting of sorbitan monooleate, sorbitan dioleate, sorbitan trioleate, sorbitan sesquioleate, sorbitan laurate, sorbitan palmitate, sorbitan stearate, and mixtures thereof. 17. The compound of claim 1, wherein the elastomer is selected from the group consisting of homopolymers of conjugated diene monomers, and copolymers and terpolymers of the conjugated diene monomers with monovinyl aromatic monomers and trienes. 18. A sulfur-vulcanizable elastomeric compound having improved tensile mechanical properties and dynamic viscoelastic properties, comprising: an elastomer; a reinforcing filler comprising silica or a mixture thereof with carbon black; a silica coupling agent selected from the group consisting of about 0.01% to about 1% by weight of a bis(trialkoxysilylorgano) tetrasulfide silica coupling agent, based on the weight of the silica, about 0.1% to about 20% by weight of a bis(trialkoxysilylorgano) disulfide silica coupling agent, based on the weight of the silica, and mixtures thereof; a silica dispersing aid; a catalytic amount of a strong organic base; and a cure agent comprising an effective amount of sulfur to achieve a satisfactory cure, wherein the elastomer, the silica, the silica coupling agent, the silica dispersing aid, and the strong organic base are mixed together, in the absence of the cure agent, at a temperature of 165째 C. to about 200째 C. 19. The compound of claim 18, wherein the compound exhibits an improved tensile mechanical or dynamic viscoelastic property compared to a similar compound mixed at the temperature in the absence of the strong organic base, the property selected from the group consisting of about a 10% to about a 40% decrease in filler flocculation after compounding, as measured by ΔG'; reduced hysteresis as measured by about a 3% to about a 20% decrease in tangent σ at 650째 C.; about a 3% to about a 20% increase in the tensile modulus at 300% strain, and combinations thereof. 20. The compound of claim 18, wherein the strong organic base is selected from the group consisting of a guanidine, a hindered amine base, and mixtures thereof. 21. The compound of claim 20, wherein the guanidine is selected from the group consisting of triphenylguanidine, diphenylguanidine, di-o-tolylguanidine, and mixtures thereof. 22. The compound of claim 21, wherein the guanidine is diphenylguanidine. 23. The compound of claim 20, wherein the hindered amine base is selected from the group consisting of 1,8-diazabicyclo[5.4.0]undec-7-ene; 1,5-diazabicyclo[4.3.0]non-5-ene; and mixtures thereof. 24. The compound of claim 18, wherein the catalytic amount of the strong organic base is about 0.1% to about 10% by weight, based on the weight of the silica. 25. The compound of claim 24, wherein the catalytic amount of the strong organic base about 0.1% to about 5% by weight, based on the weight of the silica. 26. The compound of claim 18, wherein the silica dispersing aid is selected from the group consisting of an alkyl alkoxysilane, a fatty acid ester of a hydrogenated or non-hydrogenated C5 or C6 sugar, a polyoxyethylene derivative of a fatty acid ester of a hydrogenated or non-hydrogenated C5 or C6 sugar, an ester of a polyol, and mixtures thereof. 27. The compound of claim 26, wherein the alkyl alkoxysilane is a triethoxysilane. 28. The compound of claim 26, wherein the fatty acid ester is selected from the group consisting of sorbitan monooleate, sorbitan dioleate, sorbitan trioleate, sorbitan sesquioleate, sorbitan laurate, sorbitan palmitate, sorbitan stearate, and mixtures thereof. 29. The compound of claim 18, wherein the elastomer is selected from the group consisting of homopolymers of conjugated diene monomers, and copolymers and terpolymers of the conjugated diene monomers with monovinyl aromatic monomers and trienes. 30. The compound of claim 1, wherein the elastomer comprises an alkoxysilane terminal group. 31. The compound of claim 18, wherein the elastomer comprises an alkoxysilane terminal group.
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이 특허에 인용된 특허 (9)
Christophe Penot FR, Coupling system (white filler/diene elastomer) based on polysulphurized alkoxysilane, enamine, and guanidine derivative.
Agostini Giorgio (Colmar-Berg LUX) Frank Uwe E. (Ettelbruck LUX) Materne Thierry F. E. (Attert BEX) Visel Friedrich (Bofferdange LUX) Zimmer ReneJ. (Howald LUX), Silica reinforced rubber composition and use in tires.
Agostini Giorgio (Colmar-Berg LUX) Frank Uwe Ernst (Ettelbruck LUX) Materne Thierry Florent Edme (Attert BEX) Visel Friedrich (Bofferdange LUX) Zimmer ReneJean (Howald LUX), Silica reinforced rubber composition and use in tires.
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