Abrasion resistant coating compositions based on silane hydrolysates and aluminium compounds and corresponding abrasion and shock resistant coated articles

• US 20050123771A1
• Filed: 01/24/2005
• Published: 06/09/2005
• Est. Priority Date: 03/08/1993
• Status: Abandoned Application

• Current Assignee: Anne Robert, Philippe Vaneeckhoutte, Yves Leclaire
• Original Assignee: Anne Robert, Philippe Vaneeckhoutte, Yves Leclaire
• Inventors: Leclaire, Yves, Vaneeckhoutte, Philippe, Robert, Anne
• Application Number:
  US11/041,470
• Publication Number:
  US 20050123771A1
• Time in Patent Office: Days
• US Class Current: 428/426
• CPC Class Codes: C03C 1/008 for the production of films or coatings
• CPC Class Codes: C03C 17/001 General methods for coating; Devices therefor
• CPC Class Codes: C03C 17/007 containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
• CPC Class Codes: C03C 2203/28 functional groups, e.g. vinyl, glycidyl
• CPC Class Codes: C08K 13/02 Organic and inorganic ingredients
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/06 containing silicon bound to oxygen-containing groups C08L83/12 takes precedence
• CPC Class Codes: C09D 183/06 containing silicon bound to oxygen-containing groups C09D183/12 takes precedence
• CPC Class Codes: G02B 1/105 Protective coatings
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

Abrasion resistant coating compositions based on silane hydrolyeates 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—collcidal 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 nor-reflective treatments.

Claims

1-17. -17. (canceled)

18. A hardenable composition for an abrasion resistant coating consisting essentially of the following constituents:

a hydrolysate of a silane prepared by hydrolysis of a silane containing an epoxy group and three alkoxy groups, the alkoxy groups being directly bonded to the silicon atom;

a hydrolysate of a silane prepared by hydrolysis of a silane having formula (I);

where T¹ and T² are alkoxy groups with 1 to 10 carbon atoms which will each react to give a OH group on hydrolysis of the silanes of formula (I), and Z1 and Z² are selected from the group consisting of alkyl groups with 1 to 10 carbon atoms and aryl groups with 6 to 10 carbon atoms and do not contain group capable of reacting with the hydrolysed silanes present in the composition;

colloidal silica; and

an aluminum compound selected from the group consisting of;

aluminum chelates, and

compounds having formula (III) or (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 is as defined above, and

n is a whole number from 1 to 3;

wherein the hydrolysate of a silane prepared by hydrolysis of silane having formula (I) constitutes 8% to 16% by weight of the theoretical dry content of the composition.

19. The composition of claim 18, wherein the hydrolysate of a silane prepared by hydrolysis of silane having formula (I) constitutes 10% to 15% by weight of the theoretical dry content of the composition.

20. The composition of claim 18, wherein

the aluminum compound is an aluminum chelate;

and

the composition further comprises an organic solvent whose boiling point T at atmospheric pressure is between 70°

C. and 140°

C.

21. The composition of claim 18, wherein the silane containing an epoxy group has formula (V):

22. The composition of claim 21, wherein the silane having formula (V) is γ

-glycidoxypropyltrimethoxysilane.

23. The composition of claim 18, wherein the silane of formula (I) is selected from the group consisting of methylphenyldimethoxysilane and dimethyldiethoxysilane.

24. The composition of claim 18, further comprising an alcohol solvent.

25. The composition of claim 18, comprising the following proportions of constituents:

130 to 230 parts hydrolysate of a silane prepared by hydrolysis of a silane containing an epoxy group and three alkoxy groups;

20 to 150 parts hydrolysate of a silane prepared by hydrolysis of a silane having formula (I);

200 to 800 parts colloidal silica; and

5 to 20 parts aluminum compound.

26. The composition of claim 25, further comprising 20 to 50 parts of an organic solvent whose boiling point T at atmospheric pressure is between 70°

C. and 140°

C.

27. The composition of claim 18, further comprising at least 1% by weight of water.

28. The composition of claim 18, wherein the colloidal silica forms at least 40% of the theoretical dry content of the composition.

29. The composition of claim 28, wherein the colloidal silica forms at least 50% of the theoretical dry content of the composition.

30. The composition of claim 18, wherein hardening of the composition on an ophthalmic lens substrate results in an abrasion resistant coating that is also shock resistant.

31. The composition of claim 30, wherein the ophthalmic lens substrate is a diethylene glycol di(allylcarbonate) polymer.

32. A hardenable composition for an abrasion resistant coating comprising the following constituents:

130 to 230 parts of a hydrolysate of a silane prepared by hydrolysis of a silane containing an epoxy group and three alkoxy groups, the alkoxy groups being directly bonded to the silicon atom;

20 to 150 parts of a hydrolysate of a silane prepared by hydrolysis of a silane having formula (I);

where T¹ and T² are alkoxy groups with 1 to 10 carbon atoms which will each react to give a OH group on hydrolysis of the silanes of formula (I), and Z1 and Z² are selected from the group consisting of alkyl groups with 1 to 10 carbon atoms and aryl groups with 6 to 10 carbon atoms and do not contain group capable of reacting with the hydrolysed silanes present in the composition;

200 to 800 parts colloidal silica; and

5 to 20 parts of an aluminum compound selected from the group consisting of;

aluminum chelates, and

compounds having formula (III) or (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 is as defined above, and

n is a whole number from 1 to 3;

wherein the hydrolysate of a silane prepared by hydrolysis of silane having formula (I) constitutes 8% to 16% by weight of the theoretical dry content of the composition.

33. The composition of claim 32, wherein the hydrolysate of a silane prepared by hydrolysis of silane having formula (I) constitutes 10% to 15% by weight of the theoretical dry content of the composition.

34. The composition of claim 32, wherein:

the aluminum compound is an aluminum chelate; and

the composition further comprises an organic solvent whose boiling point T at atmospheric pressure is between 70°

C. and 140°

C.

35. The composition of claim 32, wherein the silane containing an epoxy group has formula (V):

36. The composition of claim 35, wherein the silane having formula (V) is γ

-glycidoxypropyltrimethoxysilane.

37. The composition of claim 32, wherein the silane of formula (I) is selected from the group consisting of methylphenyldimethoxysilane and dimethyldiethoxysilane.

38. The composition of claim 32, further comprising an alcohol solvent.

39. The composition of claim 38, further comprising 20 to 50 parts of an organic solvent whose boiling point T at atmospheric pressure is between 70°

C. and 140°

C.

40. The composition of claim 32, further comprising at least 1% by weight of water.

41. The composition of claim 32, wherein the colloidal silica forms at least 40% of the theoretical dry content of the composition.

42. The composition of claim 41, wherein the colloidal silica forms at least 50% of the theoretical dry content of the composition.

43. The composition of claim 32, wherein hardening of the composition on an ophthalmic lens substrate results in an abrasion resistant coating that is also shock resistant.

44. The composition of claim 43, wherein the ophthalmic lens substrate is a diethylene glycol di(allylcarbonate) polymer.