Anti-fogging coating film
AssigneeToray Industries, Inc.
InventorsTakashi Taniguchi, Jiro Mibae
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Abstract
An anti-fogging film derived from the curing of polyvinyl alcohol, finely divided silica and an organic silicon compound and a hydrolysate thereof which is capable of forming silanol by hydrolysis and having such a carbon/silicon element ratio that said ratio of the surface layer of the film is larger than that of the entire film, the production process thereof, and an article covered with said film are described. The above-mentioned film has an excellent anti-fogging property, surface hardness and good service durability.
Claims12
An anti-fogging coating film comprising a cured film having a surface layer and an underlying layer, each of said layers being derived from components A, B and C and coated on a substrate, the silicon content thereof being 0.7-2.0/1.0 in terms of carbon/silicon weight ratio, and the carbon/silicon weight ratio of the surface layer of the film being larger than that of the underlying layer and being not less than 1.7/1.0 and wherein each layer comprises:
- A:
- 100 parts by weight of polyvinyl alcohol,
- B:
- 60-300 parts by weight of finely divided silica having an average particle size of about 5-200 nm, and
- C:
- 0.5-30 parts by weight of at least one compound selected from the group consisting of organic silicon compounds having a general formula:
- R.sup.1 R.sub.a.sup.2 Si(OR.sup.3).sub.3-a
- wherein R.sup.1 is an organic group having 1 to 10 carbon atoms, R.sup.2 is a hydrocarbon group having 1 to 6 carbon atoms, R.sup.3 is an alkyl, alkoxyalkyl or acyl group and a=0 or 1, and the hydrolysates thereof.
An article having on the surface thereof, an anti-fogging film comprising a cured film having a surface layer and an underlying layer, each of said layers being derived from components A, B and C and coated on a substrate, the silicon content thereof being 0.7-2.0/1.0 in terms of carbon/silicon weight ratio and the carbon/silicon weight ratio of the surface layer of the film being larger than that of the underlying layer and being not less than 1.7/1.0 and wherein each layer comprises
- A:
- 100 parts by weight of polyvinyl alcohol,
- B:
- 60-300 parts by weight of finely divided silica having an average particle size of about 5-200 nm, and
- C:
- 0.5-30 parts by weight of at least one compound selected from the group consisting of organic silicon compounds having a general formula:
- R.sup.1 R.sup.2 Si(OR.sup.2).sub.3-a
- wherein R.sup.1 is an organic group having 1 to 10 carbon atoms, R.sup.2 is a hydrogen group having 1 to 6 carbon atoms, R.sup.3 is an alkyl, alkoxyalkyl or acyl group and a=0 or 1, and the hydrolysates thereof.
Dependencies are inferred from the claim text.