Abrasion resistant coating compositions based on silane hydrolysates and aluminium compounds and corresponding abrasion and shock resistant coated articles
First Claim
1. Hardenable composition for an abrasion resistant coating comprising the following constituents:
- A—
a silane hydrolysate containing an epoxy group and three alkoxy groups, the latter groups being directly bonded to the silicon atom, B—
a silane hydrolysate having formula (I);
where T1 and T2 are groups which will each react to give a OH group on hydrolysis of the silane of formula (I), Z1 and Z2 are organic groups bonded to the silicon atom by a Si—
C bond which do not contain a group capable of reacting with the hydrolysed silanes present in the composition, C—
colloidal silica, D—
an aluminium compound selected from;
aluminium chelates, compounds having formulated (III) or (IV) (R′
O)3-nAl(OSiR″
3)n
(IV) wherein;
R and R′
are linear or branched alkyl groups with 1 to 10 carbon atoms, R″
is a linear or branched alkyl group with 1 to 10 carbon atoms, a phenyl group, a group where R has the meaning given above, and n is a whole number from 1 to 3.
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Abstract
Abrasion resistant coating compositions based on silane hydrolysates and aluminium compounds and corresponding abrasion and shock resistant coated articles
The invention relates to a hardenable composition for an abrasion resistant coating comprising the following constituents:
A—an epoxytrialkoxysilane hydrolysate,
B—a hydrolysate of a silane having formula (I)
where T1 and T2 each react to give a OH group on hydrolysis and Z1 and Z2 are unreactive organic groups,
C—colloidal silica,
D—a specific aluminium catalyst,
E—optionally, an organic solvent with a boiling point between 70° C. and 140° C.;
and to corresponding coated articles, which can have non-reflective treatments.
41 Citations
17 Claims
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1. Hardenable composition for an abrasion resistant coating comprising the following constituents:
-
A—
a silane hydrolysate containing an epoxy group and three alkoxy groups, the latter groups being directly bonded to the silicon atom,B—
a silane hydrolysate having formula (I);
where T1 and T2 are groups which will each react to give a OH group on hydrolysis of the silane of formula (I), Z1 and Z2 are organic groups bonded to the silicon atom by a Si—
C bond which do not contain a group capable of reacting with the hydrolysed silanes present in the composition,C—
colloidal silica,D—
an aluminium compound selected from;
aluminium chelates, compounds having formulated (III) or (IV) (R′
O)3-nAl(OSiR″
3)n
(IV)wherein;
R and R′
are linear or branched alkyl groups with 1 to 10 carbon atoms,R″
is a linear or branched alkyl group with 1 to 10 carbon atoms, a phenyl group, agroup where R has the meaning given above, and n is a whole number from 1 to 3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification