| 摘要 |
Fluorinated lubricants of formula: T-O-[A-B]z-[A-B′]z′-A-T′  (I) wherein: A=—(X)a—O-A′-(X′)b wherein A′ is a perfluoropolyether chain comprising units (CF2O), (CF2CF2O), (CF2CF2CF2O), (CF2CF2CF2CF2O); X, X′=—CF2—, —CF2CF2—; a, b=0 or 1; B derives from olefins, of which at least one homopolymerizable by radical route, of formula: —[(CR1R2—CR3R4)j(CR5R6—CR7R8)j′]—  (Ia) wherein j=1-5, j′=0-4 and 2<(j+j′)<5; R1-R8=halogen, H, C1-C6 (per)haloalkyl, C1-C6 alkyl, C1-C6 oxy(per)-fluoroalkyl; z≧2; z′ is 0 or an integer; z, z′ are such that the number average molecular weight of the polymer of formula (I) is in the range 500-500,000; B′=(Ia) but at least one of R1-R8 has a meaning different than that in B and 2≦̸(j+j′)<5; T, T′=C1-C3 perfluoroalkyl, C1-C6 alkyl and compositions thereof. |
