초록 ▼

Aliphatic polyesters may be substituted at the alpha- and beta-positions. These aliphatic polyesters may have increased thermal, chemical and hydrolytic stability compared to conventional aliphatic polyesters. In addition, these aliphatic polyesters may be used as high performance lubricants, includ

Aliphatic polyesters may be substituted at the alpha- and beta-positions. These aliphatic polyesters may have increased thermal, chemical and hydrolytic stability compared to conventional aliphatic polyesters. In addition, these aliphatic polyesters may be used as high performance lubricants, including lubricants for hard disk drives.

대표청구항 ▼

What is claimed is: 1. A lubricant, comprising an aliphatic polyester, comprising: monomer units of formula III where R11, R12, R13, R14 and R15 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, e is 0 or 1, f is 0 or 1 when e is 0, and f is 1 when e is 1; where, when

What is claimed is: 1. A lubricant, comprising an aliphatic polyester, comprising: monomer units of formula III where R11, R12, R13, R14 and R15 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, e is 0 or 1, f is 0 or 1 when e is 0, and f is 1 when e is 1; where, when e is 1 and R13 contains 2 or 3 carbon atoms, at least one of R11 and R14 contains from 2 to 10 carbon atoms; and monomer units of formula II where R6, R7, R8, R9 and R10 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, c is 0 or 1, d is 0 or 1 when c is 0, and d is 1 when c is 1, where the polyester further comprises monomer units of formula III′ where Q11 and Q14 are ethyl groups, Q12, Q13 and Q15 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, g is 0 or 1, h is 0 or 1 when g is 0, and h is 1 when g is 1. 2. The lubricant of claim 1, where Q12 and Q15 are methyl groups. 3. The lubricant of claim 2, where g and h are 1, and Q13 is a hydrocarbon group containing from 3 to 10 carbon atoms. 4. The lubricant of claim 2, where g and h are 1, and Q13 is a hydrocarbon group containing from 5 to 10 carbon atoms. 5. The lubricant of claim 4, further comprising monomer units of formula III″ where Q21 and Q24 are ethyl groups, Q22 and Q25 are ethyl groups, and Q23 is a hydrocarbon group containing from 3 to 10 carbon atoms. 6. A method of lubricating a surface, comprising: coating the surface with the lubricant of claim 1. 7. A hard disk drive, comprising: a magnetic disk, and a film of the lubricant of claim 1 on the disk surface. 8. The lubricant of claim 1, where the average number of monomer units of formula III in a polymer chain is from 2 to 1,000. 9. The lubricant of claim 1, further comprising monomer units of formula I where R1, R2, R3, R4 and R5 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, a is 0 or 1, b is 0 or 1 when a is 0, and b is 1 when a is 1. 10. A hard disk drive, comprising: a magnetic disk, and a lubricant film on the disk surface; the lubricant film comprising an aliphatic polyester comprising monomer units of formula I where R1, R2, R3, R4 and R5 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, a is 0 or 1, b is 0 or 1 when a is 0, and b is 1 when a is 1; and monomer units of formula II where R6, R7, R8, R9 and R10 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, c is 0 or 1, d is 0 or 1 when c is 0, and d is 1 when c is 1, where the polyester further comprises monomer units of formula III″ where Q11 and Q14 are ethyl groups, Q12, Q13 and Q15 are independently hydrocarbon groups containing from 1 to 10 carbon atoms, g is 0 or 1, h is 0 or 1 when p is 0, and h is 1 when p is 1.