Triglyceride containing solution polymerization prepared styrene/butadiene elastomer and tire with component
This invention relates to vegetable oil extended rubber containing soy oil and tire with a component of such oil extended rubber.
1. A method for preparing an oil extended styrene-butadiene rubber comprising: (1) blending front 22 phr to about 60 phr of soybean oil into a styrene-butadiene rubber cement and (2) recovering the oil extended styrene-butadiene rubber from the styrene-butadiene rubber cement.
2. The method of claim 1 wherein the styrene-butadiene rubber cement is made by the copolymerization of styrene and 1,3-butadiene in an organic solvent.
3. The method of claim 2 wherein the organic solvent is relatively inert to the copolymerization.
4. The method of claim 2 wherein the copolymerization of the styrene and 1,3-butadiene is terminated prior to blending the soybean oil into the styrene-butadiene rubber cement.
5. The method of claim 2 wherein oil extended styrene-butadiene rubber is recovered from the styrene-butadiene rubber cement by removal of the organic solvent.
6. The method of claim 5 wherein the oil extended styrene-butadiene rubber is recovered from the styrene-butadiene rubber cement by steam stripping.
7. The method of claim 1 wherein from 24 phr to about 60 phr of the soybean oil is blended into the styrene-butadiene rubber cement.
8. The method of claim 1 wherein from 25 phr to about 40 phr of the soybean oil is blended into the styrene-butadiene rubber cement.
9. The method of claim 1 wherein the oil extended styrene-butadiene rubber is void of petroleum oils.
10. The method of claim 1 wherein the styrene-butadiene rubber in the cement blended with the soybean oil in step (1) has a Mooney ML 1+4 viscosity at 100° C. before being oil extended of greater than 140.
11. A triglyceride oil extended solution styrene-butadiene rubber comprising: a solution styrene-butadiene rubber and from 22 phr to about 60 phr of soybean oil, wherein the oil extended solution styrene-butadiene rubber is void of fillers.
12. The triglyceride oil extended solution styrene-butadiene rubber of claim 11 wherein the solution styrene-butadiene rubber is void of plasticizers.
13. The triglyceride oil extended solution styrene-butadiene rubber of claim 11 wherein the soybean oil is present at a level which is within the range of 24 phr to about 40 phr.
14. The triglyceride oil extended solution styrene-butadiene rubber of claim 11 wherein the triglyceride oil extended solution styrene-butadiene rubber has a Mooney ML 1+4 viscosity at 100° C. before being oil extended of greater than 120.
15. The triglyceride oil extended solution styrene-butadiene rubber of claim 11 wherein the triglyceride oil extended solution styrene-butadiene rubber has a Mooney ML 1+4 viscosity at 100° C. before being oil extended of greater than 140.
16. The triglyceride oil extended solution styrene-butadiene rubber of claim 11 wherein the triglyceride oil extended solution styrene-butadiene rubber has a Mooney ML 1+4 viscosity at 100° C. before being oil extended of greater than 100; and wherein the triglyceride oil extended solution styrene-butadiene rubber has a vinyl microstructure content of about 63.5 percent.
17. A rubber composition which is comprised of the triglyceride oil extended solution styrene-butadiene rubber of claim 11 , about 0 phr to about 30 phr of at least one additional elastomer, and from about 40 phr to about 110 phr of at least one reinforcing filler.
18. A tire having a component which is comprised of the rubber composition of claim 17 .
19. A tire having a component which is comprised of the triglyceride oil extended styrene-butadiene rubber of claim 11 .