Importance

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Abstract

Fluorinated lubricants of formula:

description='In-line Formulae' end='lead'T-O-[A-B]_z-[A-B′]_z′-A-T′  (I)description='In-line Formulae' end='tail'

wherein:

description='In-line Formulae' end='lead'A=—(X)_a—O-A′-(X′)_b description='In-line Formulae' end='tail'

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 alkyland compositions thereof.

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First Claim