Claims
- 1. A styrene-butadiene rubber composition which is comprised of repeat units which are derived from styrene, 1,3-butadiene, and a hydroxy alkyl acrylate monomer, wherein the styrene-butadiene rubber composition has a number average molecular weight as determined by field flow fractionation which is within the range of about 50,000 to 150,000, and wherein the styrene-butadiene rubber has a light scattering to refractive index ratio which is within the range of 1.8 to 3.9.
- 2. A styrene-butadiene rubber composition as specified in claim 1 wherein said hydroxy alkyl acrylate monomer has a structural formula selected from the group consisting of:
- 3. A styrene-butadiene rubber composition as specified in claim 1 wherein the hydroxy alkyl acrylate is selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)-acrylate, 3-hydroxypropyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, 3-phenoxy-2-hydroxypropyl (meth)acrylate, glycerol mono(meth)acrylate, hydroxybutyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)-acrylate, hydroxyhexyl (meth)acrylate, hydroxyoctyl (meth)acrylate, hydroxymethyl(meth)acrylamide, 2-hydroxyethyl(meth)acrylamide, 2-hydroxypropyl(meth)-acrylamide, 3-hydroxypropyl(meth)acrylamide, di-(ethyl-ene glycol) itaconate, di-(propylene glycol) itaconate, bis(2-hydroxypropyl) itaconate, bis(2-hydroxyethyl) itaconate, bis(2-hydroxyethyl) fumarate, bis(2-hydroxy-ethyl) maleate, and hydroxy-methyl vinyl ketone.
- 4. A styrene-butadiene rubber composition as specified in claim 1 wherein the hydroxy alkyl acrylate is selected from the group consisting of hydroxymethyl (meth)acrylate, 2-hydroxyethyl(meth)-acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxy-propyl (meth)acrylate, 3-phenoxy-2-hydroxypropyl (meth)acrylate, glycerol mono(meth)acrylate, hydroxy-butyl (meth)acrylate, hydroxyhexyl (meth)acrylate, hydroxyoctyl (meth)acrylate, hydroxymethyl(meth)acryl-amide, 2-hydroxyethyl(meth)acrylamide, 2-hydroxypropyl-(meth)acrylamide, and 3-hydroxypropyl(meth)acrylamide.
- 5. A styrene-butadiene rubber composition as specified in claim 1 wherein the hydroxy alkyl acrylate is selected from the group consisting of hydroxymethyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, and 3-hydroxypropyl (meth)acrylate.
- 6. A styrene-butadiene rubber composition as specified in claim 1 wherein the hydroxy alkyl acrylate is hydroxypropylmethacrylate.
- 7. A styrene-butadiene rubber composition as specified in claim 1 wherein the hydroxy alkyl acrylate is a mixture of 2-hydroxypropylmethacrylate and 3-hydroxypropylmethacrylate.
- 8. A styrene-butadiene rubber composition as specified in claim 1 wherein the bound hydroxy alkyl acrylate monomer in the styrene-butadiene rubber is present at a level which is within the range of about 0.1 weight percent to about 15 weight percent.
- 9. A styrene-butadiene rubber composition as specified in claim 1 wherein the bound hydroxy alkyl acrylate monomer in the styrene-butadiene rubber is present at a level which is within the range of about 0.5 weight percent to about 10 weight percent.
- 10. A styrene-butadiene rubber composition as specified in claim 1 wherein the bound hydroxy alkyl acrylate monomer in the styrene-butadiene rubber is present at a level which is within the range of about 1 weight percent to about 8 weight percent.
- 11. A styrene-butadiene rubber composition as specified in claim 1 wherein the bound hydroxy alkyl acrylate monomer in the styrene-butadiene rubber is present at a level which is within the range of about 3 weight percent to about 5 weight percent.
- 12. A styrene-butadiene rubber composition as specified in claim 1 wherein the number average molecular weight as determined by field flow fractionation that is within the range of about 60,000 to 145,000.
- 13. A styrene-butadiene rubber composition as specified in claim 3 wherein the styrene-butadiene rubber has a light scattering to refractive index ratio that is within the range of 2.0 to 3.8.
- 14. A styrene-butadiene rubber composition as specified in claim 13 wherein the number average molecular weight as determined by field flow fractionation which is within the range of about 75,000 to 140,000.
- 15. A styrene-butadiene rubber composition as specified in claim 14 wherein a plot of log frequency versus elastic modulus of the styrene-butadiene rubber composition crosses over a plot of log frequency versus loss modulus of the styrene-butadiene rubber composition at a frequency within the range of 0.001 radians per second to 100 radians per second when conducted at 90° C. to 120° C. using parallel plate geometry in the dynamic oscillation frequency sweep of the styrene-butadiene rubber.
- 16. A tire having a tread that is comprised of the styrene-butadiene rubber composition specified in claim 1.
- 17. A tire as specified in claim 16 wherein the tread is further comprised of a filler selected from the group consisting of carbon black and silica; wherein the tread is further comprised of a rubber selected from the group consisting of natural rubber, high cis-1,4-polybutadiene rubber, high vinyl polybutadiene rubber, medium vinyl polybutadiene rubber, high trans-1,4-polybutadiene rubber, solution styrene-butadiene rubber, styrene-isoprene-butadiene rubber, styrene-isoprene rubber, isoprene-butadiene rubber and 3,4-polyisoprene rubber; and wherein the tread is cured with sulfur.
- 18. An emulsion styrene-butadiene rubber composition which is made by a process which comprises coagulating a latex composition which is comprised of (a) water, (b) an emulsifier, (c) a high molecular weight styrene-butadiene rubber having a weight average molecular weight of at least about 300,000 and (d) a low molecular weight styrene-butadiene rubber having a weight average molecular weight of less than about 280,000; wherein the ratio of the high molecular weight styrene-butadiene rubber to the low molecular weight styrene-butadiene rubber is within the range of about 80:20 to about 25:75; wherein the bound styrene content of the high molecular weight styrene-butadiene rubber differs from the bound styrene content of the low molecular weight styrene-butadiene rubber by at least 5 percentage points; and wherein the high molecular weight styrene butadiene rubber and/or the low molecular weight styrene butadiene rubber contain repeat units that are derived from a hydroxy alkyl acrylate monomer.
- 19. An emulsion styrene-butadiene rubber composition as specified in claim 18 wherein the bound styrene content of the high molecular weight styrene-butadiene rubber differs from the bound styrene content of the low molecular weight styrene-butadiene rubber by at least 10 percentage points; and wherein the high molecular weight styrene-butadiene rubber has a weight average molecular weight which is within the range of about 400,000 to about 1,750,000 and wherein the low molecular weight styrene-butadiene rubber has a weight average molecular weight which is within the range of about 70,000 to about 270,000.
- 20. An emulsion styrene-butadiene rubber composition as specified in claim 18 wherein the bound styrene content of the high molecular weight styrene-butadiene rubber differs from the bound styrene content of the low molecular weight styrene-butadiene rubber by at least 15 percentage points; wherein the high molecular weight styrene-butadiene rubber has a weight average molecular weight which is within the range of about 1,000,000 to about 1,500,000; and wherein the low molecular weight styrene-butadiene rubber has a weight average molecular weight which is within the range of about 120,000 to about 260,000.
Parent Case Info
[0001] This application claims the benefit of United States. Provisional Application Ser. No. 60/236,291, filed on Sep. 28, 2000.
Provisional Applications (1)
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Number |
Date |
Country |
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60236291 |
Sep 2000 |
US |