Polymers comprising repeating units of the formula I:
##STR1##
where the variables are defined as follows:
a is an integer from 0 to 3,
R1, R2, R3 are identical or different and
are selected independently from among hydrogen, C1-C20-alkyl,
C1-C20-alkyl containing one or more Si, N, P, O or S atoms,
C6-C30-aryl, preferably C6-C14-aryl,
C4-C14-heteroaryl, —N(C6-C14-aryl)2,
and Y1, where Y1 may be identical or different and
are selected from among —CHCH2, trans- or cis-CHCH—C6H5,
acryloyl, methacryloyl, methylstyryl, O—CHCH2 and glycidyl,
##STR2##
where Y2 is selected from among —CHCH2,
trans- or cis- CHCH—C6H5, acryloyl, methacryloyl,
methylstyryl, —O—CHCH2 and glycidyl, and one or
more groups Y1 or Y2 may be crosslinked to one another.
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