Bicycloaliphatic 2-methylene-1,3-dioxepanes
AssigneeIvoclar AG
InventorsVolker Rheinberger, Norbert Moszner, Ulrich Salz, Thomas Voelkel
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Abstract
The present invention relates to novel bicycloaliphatic 2-methylene-1,3-dioxepanes, which are suitable as starting materials for the preparation of polymers and copolymers, preferably of composite and dental materials. The 2-methylene-1,3-dioxepanes according to the invention, which can undergo radical polymerisation with ring opening with only very little volume shrinkage, can be prepared in a simple manner, are easy to purify and to modify chemically, and are characterised by lack of odour and advantageous physical properties.
Claims17
Bicycloaliphatic 2-methylene-1,3-dioxepanes having the general formula ##STR46## wherein n and p each equal 0 or 1,
- m equals 0 or 1,
- U and V each mean oxygen or (CH.sub.2).sub.q, wherein q is an integer from 0 to 3,
- R, R.sup.1 and R.sup.2 each stand for hydrogen, an alkyl group, an alkenyl group, an aryl group or a cycloaliphatic radical and may each contain a further substituent from the group comprising alkyl, vinyl, acryl, acryloxy, methacryl, methacryloxy, COOR.sup.3, CONR.sub.2.sup.3 and OR.sup.3, and wherein R.sup.3 stands for an alkyl group and/or aryl group, wherein one of the radicals R, R.sup.1 or R.sup.2 may be linked with a second 2-methylene-1,3-dioxepane ring having the formula (I), or R.sup.1 and R.sup.2 stands for a methylene group.
Dependencies are inferred from the claim text.