Optical article comprising a surfactant-based temporary antifog coating with an improved durability

Patent metadata

Field	Value
Publication number	US-9645285-B2
Application number	US-201214234349-A
Country	US
Kind code	B2
Filing date	Jun 28, 2012
Priority date	Jul 22, 2011
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

The present invention relates to an optical article comprising a substrate coated with a coating preferably comprising silanol groups on its surface and, directly contacting this coating, an antifog coating precursor coating, said precursor coating preferably having a static contact angle with water of more than 10° and of less than 50° and being obtained through the grafting of at least one organosilane compound possessing a polyoxyalkylene group and at least one silicon atom bearing at least one hydrolyzable group, and is further coated with a film obtained by applying a composition containing at least one surfactant of formula F(CF 2 ) y —(CH 2 —CH 2 O) x+1 H (VIII), wherein x is an integer ranging from 1 to 14, y is an integer lower than or equal to 10, compounds of formula (VIII) in which y=6 representing at least 90% by weight by weight, relative to the weight of compounds (VIII) present in the composition, so as to form an antifog coating, having preferably a static contact angle with water lower than or equal to 10°.

First claim

The invention claimed is:

1. An optical article comprising a substrate having at least one main surface coated with a first coating and, directly contacting this first coating, a precursor coating of an antifog coating, wherein the coating precursor of the antifog coating is:
obtained through the grafting of at least one organosilane compound comprising:
a polyoxyalkylene group; and
at least one silicon atom bearing at least one hydrolyzable group; and

further coated with a film obtained by applying onto the precursor coating a surfactant-containing composition containing at least one surfactant of formula:
F(CF 2 ) y —(CH 2 —CH 2 O) x+1 H  (VIII),

wherein x is an integer ranging from 1 to 14, y is an integer lower than or equal to 10, compounds of formula (VIII) in which y=6 are present in an amount of at least 90% by weight relative to the weight of compounds (VIII) present in said composition, so as to form an antifog coating.

2. The optical article of claim 1 , wherein the polyoxyalkylene group comprises less than 80 carbon atoms.

3. The optical article of claim 1 , wherein compounds of formula (VIII) in which y=6 are present in an amount of at least 95% by weight relative to the weight of compounds (VIII) present in the composition.

4. The optical article of claim 3 , wherein compounds of formula (VIII) in which y=6 are present in an amount of 100% by weight relative to the weight of compounds (VIII) present in the composition.

5. The optical article of claim 1 , wherein the antifog coating has a static contact angle with water lower than or equal to 5°.

6. The optical article of claim 1 , wherein the compounds of formula (VIII), in which x ranges from 1 to 4, are present in an amount of at least 50% by weight, relative to the weight of compounds (VIII) present in the surfactant-containing composition.

7. The optical article of claim 1 , wherein the surfactant-containing composition comprises from 0.5 to 15% by weight of surfactants of formula (VIII), relative to the weight of the composition.

8. The optical article of claim 1 , wherein the compounds of formula (VIII), in which y is higher than 6, are present in an amount of less than 5% by weight, relative to the weight of compounds (VIII) present in the surfactant-containing composition.

9. The optical article of claim 8 , wherein the compounds of formula (VIII), in which y is higher than 6, are present in an amount of 0%, relative to the weight of compounds (VIII) present in the surfactant-containing composition.

10. The optical article of claim 1 , wherein the first coating comprises silanol groups on its surface.

11. The optical article of claim 1 , wherein the coating precursor of the antifog coating has a thickness lower than or equal to 5 nm.

12. The optical article of claim 1 , wherein the coating precursor of the antifog coating has a static contact angle with water of more than 10° and of less than 50°.

13. The optical article of claim 1 , wherein the organosilane compound is a compound of formula:
R 1 Y m Si(X) 3-m   (I)

wherein the Y groups independently, are monovalent organic groups bound to the silicon through a carbon atom, the X groups independently are hydrolyzable groups, R 1 is a group comprising a polyoxyalkylene group, and m is an integer equal to 0, 1 or 2.

14. The optical article of claim 1 , wherein the organosilane compound comprises a polyoxyalkylene group comprising from 5 to 20 carbon atoms.

15. The optical article of claim 1 , further defined as an ophthalmic lens.

16. A method for imparting antifog properties to an optical article having at least one main surface, comprising applying onto the main surface a surfactant-containing composition such as defined in claim 1 , wherein the optical article comprises a substrate having at least one main surface coated with a precursor coating of an antifog coating, and wherein the coating precursor of the antifog coating is obtained through the grafting of at least one organosilane compound having:
a polyoxyalkylene group comprising carbon atoms; and
at least one silicon atom bearing at least one hydrolyzable group.

17. The method of claim 16 , wherein applying the surfactant-containing composition onto the main surface comprises wiping the main surface with a non-woven tissue comprising a structure which comprises a hydrophilic polymer and a hydrophobic polymer, said tissue being impregnated with the surfactant-containing composition.

18. The method of claim 16 , wherein applying the surfactant-containing composition onto the main surface comprises wiping the main surface with a dry microfiber tissue having microfibers comprising polymers comprising polyester units and polyamide units impregnated with the surfactant containing composition.

19. The method of claim 16 , wherein the main surface of the optical article has a static contact angle with water of 100° or less before applying the surfactant-containing composition.

20. The method of claim 19 , wherein the main surface of the optical article has a static contact angle with water of more than 10° and of less than 50° before applying the surfactant-containing composition.

21. The method of claim 16 , wherein the polyoxyalkylene group comprises less than 80 carbon atoms.

Assignees

• Cadet Mamonjy
• Cretier Annette
• Saint-Lu Charlotte
• Satisloh Ag

Inventors

• Cadet Mamonjy
• Cretier Annette
• Saint-Lu Charlotte

Classifications

• C08K5/5419

  containing at least one Si—C bond · CPC title

• C03C2217/75

  Hydrophilic and oleophilic coatings · CPC title

• G02B27/0006

  with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation (G02B1/18 takes precedence; cleaning in general B08B) · CPC title

• Y10T428/31536

  Including interfacial reaction product of adjacent layers · CPC title

• B05D1/36

  Successively applying liquids or other fluent materials, e.g. without intermediate treatment · CPC title