Claims
- 1. A terpolymer useful as a pour depressant for distillate fuel oils, said terpolymer comprising ethylene, vinyl acetate and isobutylene wherein the number average molecular weight of said terpolymer is from about 400 to about 1200, the weight average molecular weight of said terpolymer is from about 1500 to about 3000, and said terpolymer has a vinyl acetate content of from about 30 to about 45 weight percent, an isobutylene content effective to provide a methyl/100 methylenes ratio in said terpolymer of from about 2 to about 15, as determined by proton NMR, and the balance being ethylene.
- 2. The terpolymer of claim 1 wherein said terpolymer has a viscosity of from about 100 to about 300 cP at 140.degree. F.
- 3. The terpolymer of claim 2 having a viscosity of from about 130 to about 230 cP at 140.degree. F.
- 4. The terpolymer of claim 1 having a vinyl acetate content of from about 30 to about 40 percent by weight.
- 5. The terpolymer of claim 1 wherein the number average molecular weight is about 500 to about 900 and the weight average molecular weight is about 2000 to about 2500.
- 6. The terpolymer of claim 1 having a methyl/100 methylenes ratio of about 4 to about 12 as determined by proton NMR.
- 7. A distillate fuel oil composition having improved pour and flowability characteristics comprising a major proportion of a distillate fuel oil and a pour point depressant effective amount of a terpolymer comprised of ethylene, vinyl acetate and isobutylene, said terpolymer having a number average molecular weight of from about 400 to about 1200, a weight average molecular weight of from about 1,500 to about 3,000, a vinyl acetate content of from about 30 weight percent to about 45 weight percent and an isobutylene content effective to provide a methyl/100 methylenes ratio of from about 2 to about 15, as determined by proton NMR.
- 8. The distillate fuel oil composition of claim 7 wherein said terpolymer has a viscosity of from about 100 to about 300 cP at 140.degree. F.
- 9. The distillate fuel oil composition of claim 7 wherein said terpolymer has a vinyl acetate content of from about 30 to about 40 percent by weight.
- 10. The distillate fuel oil composition of claim 7 wherein said terpolymer has a viscosity of from about 130 to about 230 cP at 140.degree. F.
- 11. The distillate fuel oil composition of claim 7 wherein the number average molecular weight of said terpolymer is about 500 to about 900 and the weight average molecular weight of said terpolymer is about 2000 to about 2500.
- 12. The distillate fuel oil composition of claim 7 wherein the terpolymer has a methyl/100 methylenes ratio of about 4 to about 12 as determined by proton NMR.
- 13. The distillate fuel oil composition of claim 7 wherein the effective pour point depressant amount of said terpolymer is about 100to about 1000 ppm by weight of said fuel oil.
- 14. The distillate fuel oil composition of claim 7 wherein the effective pour point depressant amount of said terpolymer is about 200 to about 800 ppm by weight of said fuel oil.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 678,945, filed Dec. 6, 1984 now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0099646 |
Jan 1984 |
EPX |
1462628 |
Jan 1977 |
GBX |
Continuation in Parts (1)
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Number |
Date |
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Parent |
678945 |
Dec 1984 |
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