Silanes of the formula:
[(Z.sub.mR.sub.nSi--R.sup.1.sub.o--).sub.pR.sup.2.sub.q--Y--C(X)--Y--].su-
b.rG[--Y--(X)C--Y--R.sup.3].sub.s (I), in which m+n=3; m=1, 2 or 3; n=0,
1 or 2; o=0 or 1, and q=1 if o=0; p=1, 2, 3 or 4; q=0 or 1, and p=1 if
q=0; r, s=1, 2 or 3; and Z is a hydrolyzable atom or group; R is a
nonhydrolyzable group without an epoxide group; R.sup.1 is a divalent
group; R.sup.2 is a (p+1)-valent group; R.sup.3 is a nonhydrolyzable,
epoxy-containing group; X is an oxygen atom and/or sulfur atom; G is an
(r+s)-valent cyclic group; Y is an oxygen atom, sulfur atom or imino
group >NR.sup.4 where R.sup.4=hydrogen atom, group R, group
(Z.sub.mR.sub.nSi--R.sup.1.sub.o--).sub.pR.sup.2.sub.q--, group
R.sup.3--, group
(Z.sub.mR.sub.nSi--R.sup.1.sub.o--).sub.pR.sup.2.sub.q--NH--C(X)-- or
group R.sup.3--NH--C(X)--; processes for their preparation, and their
use.
