초록 ▼

A viscosity index (VI) improver concentrate containing at least one VI improver, from 0 to about 5 mass % of lubricating oil flow improver (LOFI) and diluent oil, wherein the diluent oil has a kv100 of at least about 3.0 cSt and a CCS at-35째 C. of less than 3700 cPs, and wherein at least about 98 ma

A viscosity index (VI) improver concentrate containing at least one VI improver, from 0 to about 5 mass % of lubricating oil flow improver (LOFI) and diluent oil, wherein the diluent oil has a kv100 of at least about 3.0 cSt and a CCS at-35째 C. of less than 3700 cPs, and wherein at least about 98 mass % of the concentrate is composed of VI improver, LOFI and diluent oil.

대표청구항 ▼

What is claimed is: 1. A viscosity index (VI) improver concentrate comprising at least one VI improver, from 0 to about 5 mass % of lubricating oil flow improver (LOFI) and diluent oil, wherein the diluent oil has a kv100 of at least about 3.0 cSt and a CCS at-35째 C. of less than 3700 cPs, wherein

What is claimed is: 1. A viscosity index (VI) improver concentrate comprising at least one VI improver, from 0 to about 5 mass % of lubricating oil flow improver (LOFI) and diluent oil, wherein the diluent oil has a kv100 of at least about 3.0 cSt and a CCS at-35째 C. of less than 3700 cPs, wherein at least about 98 mass % of said concentrate consists essentially of said VI improver, said LOFI and said diluent oil, and wherein the diluent oil is a Group II, Group III or Group IV oil, a mixture thereof, or a mixture of a Group I oil and at least one Group II, Group III or Group IV oil. 2. A concentrate of claim 1, wherein said diluent oil has a Noack volatility of less than about 40 mass %. 3. A concentrate of claim 2, wherein said diluent oil has a Noack volatility of less than about 35 mass %. 4. A concentrate of claim 3, wherein said diluent oil has a Noack volatility of less than 32 mass %. 5. A concentrate of claim 1, wherein the concentrate has a kv100 of from about 300 to about 2500 cSt. 6. A concentrate of claim 1, wherein the VI improver is a copolymer of ethylene and another α-olefin (OCP). 7. A concentrate of claim 6, wherein the VI improver is an amorphous OCP having an ethylene content of less than 60 mass %, based on the total mass of OCP. 8. A concentrate of claim 1, wherein the VI improver is selected from the group consisting of homopolymers and copolymers of diolefins containing from about 4 to 12 carbon atoms, copolymers of one or more conjugated diolefins containing from about 4 to 12 carbon atoms and one or more monoalkenyl aromatic hydrocarbons containing from about 8 to 16 carbon atoms, and hydrogenated, functionalized and hydrogenated and functionalized derivatives thereof. 9. A concentrate of claim 8, wherein the VI improver is selected from the group consisting of linear random polymers, linear tapered polymers, linear block copolymers, random star polymers, tapered star polymers and block star polymers. 10. A concentrate of claim 1, wherein the diluent oil is a mixture of a Group I oil and at least one Group II and Group III oil. 11. A concentrate of claim 1, containing from about 4 to about 50 mass % of VI improver. 12. A concentrate of claim 1, wherein the diluent oil has a CCS at-35째 C. of less than 3300 cPs. 13. A concentrate of claim 12, wherein the diluent oil has a CCS at-35째 C. of less than 3000 cPs. 14. A concentrate of claim 13, wherein the diluent oil has a CCS at-35째 C. of less than 2500 cPs. 15. A concentrate of claim 1, wherein the diluent oil has a sulfur content of less than about 1 mass %. 16. A concentrate of claim 1, wherein the diluent oil has a sulfur content of from about 0 to about 0.3 mass %. 17. A concentrate of claim 1, wherein the diluent oil has a saturate content of greater than about 90%. 18. A concentrate of claim 1, wherein the diluent oil has a viscosity index (VI) of at least about 85. 19. A concentrate of claim 1, wherein said VI improver is a multifunctional VI improver.