PCT No. PCT/EP96/01888 Sec. 371 Date Nov. 17, 1997 Sec. 102(e) Date Nov. 17, 1997 PCT Filed May 7, 1996 PCT Pub. No. WO96/36890 PCT Pub. Date Nov. 21, 1996The present invention describes a polysiloxane-polyol macromer which is uninterrupted or interrupted by a bivalent structural element and furthermore carries at least one polymerizable segment on a polyol segment; a polymer comprising a polymerization product of at least one macromer according to the invention and, if appropriate, of at least one vinylic comonomer; intermediates; processes for the preparation of a macromer and a polymerization product; moldings, contact lenses, corneal implants or biomedical articles of a polymerization product; and furthermore the use of a macromer according to the invention or of a polymer prepared therefrom for coating a substrate.