Antireflection filter
First Claim
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1. An antireflection filter comprising a transparent substrate in the form of a film or sheet, an antireflection coating on at least one surface of said substrate, which coating comprises an inorganic compound, and a stain proofing layer having a thickness of 0.001 to 0.03 μ
- m on said antireflection coating, which layer comprises a silane compound having a number average molecular weight of 5×
102 to 1×
105 represented by the formula (I);
##STR4## wherein Rf is a straight or branched perfluoroalkyl group having 1 to 16 carbon atoms, X is an iodine atom or a hydrogen atom, Y is a hydrogen atom or a C1-5 alkyl group, Z is a fluorine atom or a trifluoromethyl group, R1 is a hydrolyzable group, R2 is a hydrogen atom or an inactive monovalent organic group, a, b, c and d are the same or different and each an integer of 0 to 200, e is 0 or 1, m and n are the same or different and each 0, 1 or 2, and p is an integer of 1 to 10.
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Abstract
An antireflection filter comprising a film- or sheet-form transparent substrate, an antireflection coating on at least one surface of the substrate, which coating contains an inorganic compound, and a stain proofing layer on the antireflection coating, which layer contains a specific silane compound having an average molecular weight of 5×102 to 1×105.
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Citations
14 Claims
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1. An antireflection filter comprising a transparent substrate in the form of a film or sheet, an antireflection coating on at least one surface of said substrate, which coating comprises an inorganic compound, and a stain proofing layer having a thickness of 0.001 to 0.03 μ
- m on said antireflection coating, which layer comprises a silane compound having a number average molecular weight of 5×
102 to 1×
105 represented by the formula (I);
##STR4## wherein Rf is a straight or branched perfluoroalkyl group having 1 to 16 carbon atoms, X is an iodine atom or a hydrogen atom, Y is a hydrogen atom or a C1-5 alkyl group, Z is a fluorine atom or a trifluoromethyl group, R1 is a hydrolyzable group, R2 is a hydrogen atom or an inactive monovalent organic group, a, b, c and d are the same or different and each an integer of 0 to 200, e is 0 or 1, m and n are the same or different and each 0, 1 or 2, and p is an integer of 1 to 10. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- m on said antireflection coating, which layer comprises a silane compound having a number average molecular weight of 5×
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10. A method for stain proofing an antireflection filter which comprises an antireflection coating on at least one surface of a transparent substrate in the form of a film or sheet, wherein said coating comprises an inorganic compound, said method comprising:
providing a stain proofing layer of a silane compound on said antireflection coating, wherein said silane compound has a number average molecular weight of 5×
102 to 1×
105 represented by the formula (I);
##STR5## wherein Rf is a straight or branched perfluoroalkyl group having 1 to 16 carbon atoms, X is an iodine atom or a hydrogen atom, Y is a hydrogen atom or a C1-5 alkyl group, Z is a fluorine atom or a trifluoromethyl group, R1 is a hydrolyzable group, R2 is a hydrogen atom or an inactive monovalent organic group, a, b, c and d are the same or different and each an integer of 0 to 200, e is 0 or 1, m and n are the same or different and each 0, 1 or 2, and p is an integer of 1 to 10.- View Dependent Claims (11, 12, 13, 14)
Specification