DETAILED DESCRIPTION OF THE INVENTION The instant invention pertains to a composition for coating glass which is the reaction product of two components.
The first component is a trialkoxysilyl adduct which may be linear or branched; the second component is a polysiloxanediol or silanediol.
The first component is a compound of formula A [(EO).
sub.
3 -Si-R-X-].
sub.
k T (A) wherein k is 2 to 4, E is methyl or ethyl, R is ethylene or trimethylene, X is --NHCONH--, --NHCOO--, --S--, --NHCO-- or a direct bond, where the --NH-- group is attached to R, and T is, when k is 2 and X is a direct bond, --NHCONH--, or T is, when X is --NHCONH--, the residue of a diisocyanate or a triisocyanate after removal of 2 or 3 NCO groups, or T is, when X is --NHCOO--, the residue of a diol, triol or tetraol or of a isocyanate or a poly(dimethylsiloxane) alkanepolyol after removal of 2, 3 or 4 OH groups, or T is, when X is --S--, alkylene of 1 to 12 carbon atoms, alkanetriyl of 3 to 8 carbon atoms or alkanetetrayl of 4 to 10 carbon atoms, or T is, when X is --NHCO--, alkylene of 2 to 10 carbon atoms or arylene of 6 to 10 carbon atoms.
The second component needed to prepare the instant coating composition is a compound of the formula B HO-[Si(L).
sub.
2 -O-].
sub.
n -H (B) wherein n is 1 to 100, and L is methyl, isopropyl, --CH.
sub.
2 CH.
sub.
2 CF.
sub.
3, tert-butyl, cyclohexyl or phenyl.
Preferably n is 1 and L is phenyl.
The reaction of the first and second components forms a compound of formula [HO[Si(L).
sub.
2 -O-].
sub.
n -Si(OE).
sub.
2 R-X-].
sub.
k T (I) where L, R, X, T, n and k are as defined above.
Preferably, k is 2 or 3, most preferably 2.
Preferably E is ethyl.
Preferably R is trimethylene.
Preferably X is --NHCONH-- or --NHCOO--, most preferably --NHCONH--.
Preferably when X is --NHCONH--, T is a residue of a diisocyanate.
Preferably when X is --NHCOO--, T is the residue of a diol.
Preferably when X is --S--, T is alkylene of 1 to 8 carbon atoms, most preferably alkylene of 2 to 4 carbon atoms.
Preferably X is --NHCO--, T is alkylene of 2 to 8 carbon atoms, most preferably alkylene of 4 to 6 carbon atoms
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Molecular Biology 
