(Meth)-acrylic acid esters and their use
AssigneeBayer Aktiengesellschaft
InventorsJurgen Reiners, Jens Winkel, Erich Klauke, Carlhans Suling, Wolfgang Podszun
Life of this patent
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Abstract
(Meth)-acrylic acid esters of the formula ##STR1## in which R.sup.1 and R.sup.2 are identical or different and denote hydrogen, chlorine, fluorine or a C.sub.1 - to C.sub.4 -alkyl radical and R.sup.3 and R.sup.4 are identical or different and represent the group ##STR2## wherein R.sup.5 and R.sup.6 are identical or different and denote hydrogen or methyl, Z denotes a straight-chain or branched C.sub.2 - to C.sub.8 -alkylene chain and n denotes values from 1 to 4. Such (meth)-acrylic acid esters can be used as dental fillers or to coat teeth.
Claims10
A (meth)-acrylic acid ester of the formula ##STR21## in which R.sup.l and R.sup.2 are identical or different and denote hydrogen, chlorine, fluorine or a C.sub.l - to C.sub.4 -alkyl radical and
- R.sup.3 and R.sup.4 are identical or different and represent the group ##STR22## wherein R.sup.5 and R.sup.6 are identical or different and denote a hydrogen atom or a methyl group,
- Z denotes a straight-chain or branched C.sub.2 - to C.sub.8 -alkylene chain and
- n denotes values from 1 to 4.
A process for the preparation of a (meth)-acrylic acid ester comprising etherifying a 1,2-bis-(fluorophenyl)-1,1,2,2-tetrafluoroethane of the formula ##STR26## in which R.sup.1 and R.sup.2 are identical or different and denote hydrogen, chlorine, fluorine or a C.sub.1 - to C.sub.4 -alkyl radical, with an .alpha.,.omega.-dihydroxy compound of the formula
- HO--[--CH.sub.2 --CHR.sup.5 --O--]--.sub.n H
- in which
- R.sup.5 denotes hydrogen or methyl and
- n denotes values from 1 to 4, and esterifying the resultant product with (meth)-acrylic acid and/or its reactive derivatives or reacting the resultant reaction product with an iso-cyanatoalkyl(meth)-acrylate.
Dependencies are inferred from the claim text.