Oligomers of fluorinated olefins
AssigneeHoechst Aktiengesellschaft
InventorKonrad von Werner
Life of this patent
Estimating the term…
Abstract
Oligomers of compounds of the formula X--(CF.sub.2).sub.a --O.sub.b --(CH.sub.2).sub.c --CH=CH.sub.2( 1) and co-oligomers of compounds of the formula (1) together with compounds of the formula X--(CX.sub.2).sub.d --O.sub.b --(CX.sub.2).sub.c --CX=CX.sub.2( 2) in which X is hydrogen or fluorine, a is a number from 2 to 16, b and c are, independently of one another, 0 or 1, and d is a number from 0 to 6, with a mean degree of oligomerization of 2 to 4, are obtained by heating a solution of the monomers in a hydrocarbon together with a free radical-forming catalyst to 135.degree. to 180.degree. C. The oligomers are lubricating agents and lubricants.
Claims16
An oligomer of compounds of the formula
- X--(CF.sub.2).sub.a --O.sub.b --(CH.sub.2).sub.c --CH=CH.sub.2( 1)
- and co-oligomers of compounds of the formula (1) together with compounds of the formula
- X--(CX.sub.2).sub.d --O.sub.b --(CX.sub.2).sub.c --CX=CX.sub.2( 2)
- in which X is hydrogen or fluorine, a is a number from 2 to 16, b and c are, independently of one another, 0 or 1, and d is a number from 0 to 6, with a mean degree of oligomerization of 2 to 4.
A process for preparing an oligomer or co-oligomer with a mean degree of oligomerization of 2 to 4, which comprises:
- heating a solution of at least one compound of the formula (1)
- X--(CF.sub.2).sub.a --O.sub.b --(CH.sub.2).sub.c --CH=CH.sub.2( 1),
- or a mixture thereof with at least one compound of the formula (2)
- X-(CX.sub.2).sub.d --O.sub.b --(CX.sub.2).sub.c --CX=CX.sub.2 in which X is hydrogen or fluorine, a is a number from 2 to 16, b and c are, independently of one another, 0 or 1, and d is a number from 0 to 6,
- in a hydrocarbon to a temperature of 135.degree. to 180.degree. C. together with a free radical-forming catalyst, and recovering a said oligomer or co-oligomer having a mean degree of oligomerization of 2 to 4.
Dependencies are inferred from the claim text.