Reflection-preventive pellicle film
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsTokinori Agou, Hitomi Matsuzaki, Masahide Tanaka, Takamasa Tsumoto, Masaaki Kawasaki, Takami Nishikawa, Shuji Minami
Life of this patent
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Abstract
A reflection-preventive layer composed of a specific polyfluoro(meth)acrylate is formed on one or both of the surfaces of a transparent film of a cellulose derivative. In this reflection-preventive pellicle film, the minimum light transmission in wavelengths of 350 to 450 nm is improved and the average light transmission is improved, and the adhesion of the reflection-preventive layer to the cellulose derivative layer is excellent.
Claims13
A reflection-preventive pellicle film comprising a transparent film of a cellulose derivative and a reflection-preventive layer of a polyfluoro(meth)acrylate formed on one or both of the surfaces of the transparent film, wherein said polyfluoro(meth)acrylate is selected from the group consisting of:
- (1) a polyfluoroacrylate which is a copolymer of (A) trifluoroethyl acrylate and (B) perfluorooctylethyl acrylate having an (A)/(B) molar ratio of from 55/45 to 75/25 and a reduced specific viscosity lower than 1 dl/g, a measured in a m-xylene hexafluoride solution having a concentration of 0.1 g/dl at 30.degree. C.,
- (2) a polyfluoro(meth)acrylate which is a copolymer of at least one monomer represented by the following general formula:
- ##STR40## wherein R.sup.1 represents a hydrogen atom or a methyl group, and R.sup.3 stands for fluoroalkyl group,
- and at least one monomer represented by the following general formula:
- ##STR41## wherein R.sup.1 is as defined above, and Y stands for a hydrocarbon group containing an intermediate etheric oxygen atom or a hydrocarbon group containing an intermediate etheric oxygen atom, to which a fluoroalkyl group is bonded,
- (3) a polyfluoro(meth)acrylate which is a
- copolymer of at least one monomer represented by the following general formula:
- ##STR42## wherein R.sup.1 is as defined above, and R.sup.4 stands for a linear fluoroalkyl group not containing an etheric oxygen atom,
- and at least one monomer represented by the following general formula:
- ##STR43## wherein R.sup.1 is as defined above, and R.sup.5 stands for a linear fluoroalkyl group containing an etheric oxygen atom or a branched fluoroalkyl group which may contain an etheric oxygen atom,
- and (4) a polyfluoro(meth)acrylate which is a copolymer by the following general formula:
- ##STR44## wherein R.sup.1 is as defined above, and R.sup.2 represents a fluoroalkyl group which may contain an intermediate etheric oxygen atom,
- and at least one monomer represented by the following general formula:
- ##STR45## wherein R.sup.1 is as defined above, and R.sup.6 stands for an alkyl group.
A reflection-preventive pellicle film comprising a transparent film of a cellulose derivative and a reflection-preventive layer of a polyfluoro(meth)acrylate formed on one or both of the surfaces of the transparent film, wherein said polyfluoro(meth)acrylate comprises a monomer represented by the following general formula:
- ##STR46## wherein R.sup.1 stands for hydrogen atom or methyl group, and R.sup.2 stands for a perfluoroalkylether group,
- and has a fluorine content of at least 50% by weight in the polymer.
A reflection-preventive pellicle film comprising a transparent film of a cellulose derivative and a reflection-preventive layer of polyfluoro(meth)acrylate formed on one or both of the surfaces of the transparent film, wherein said polyfluoro(meth)acrylate is a copolymer of (A) trifluoroethyl acrylate and (B) perfluorooctylethyl acrylate having an (A)/(B) molar ratio of from 55/45 to 75/25 and a reduced specific viscosity lower than 1 dl/g, as measured in an m-xylene hexafluoride solution having a concentration of 0.1 g/dl at 30.degree. C.
A reflection-preventive pellicle film comprising a transparent film of a cellulose derivative and a reflection-preventive layer of a polyfluoro(meth)acrylate formed on one or both of the surfaces of the transparent film, wherein said polyfluoro(meth)acrylate film, wherein said polyfluoro(meth)acrylate is a copolymer of (1) at least one monomer represented by the following general formula:
- ##STR48## wherein R.sup.1 stands for a hydrogen atom or a methyl group, and R.sup.2 stands for a perfluoroalkyl group free of an etheric oxygen atom, having 2 to 14 carbon atoms,
- and (2) at least one monomer represented by the following general formula:
- ##STR49## wherein R.sup.1 is as defined above, and Y stands for (i) a monovalent hydrocarbon group containing an intermediate etheric oxygen atom or (ii) a monovalent hydrocarbon group containing an intermediate etheric oxygen atom, to which a fluoroalkyl group is bonded, the group Y having 5 to 50 carbon atoms,
- said copolymer having a monomer ration of the monomer (2) ranging from 1 to 20 mole % and a fluorine content of 50 to 70% by weight.
A reflection-preventive pellicle film comprising a transparent film of a cellulose derivative and a reflection-preventive layer of a polyfluoro(meth)acrylate formed on or both of the surfaces of the transparent film, wherein said polyfluoro(meth)acrylate is a copolymer of (1) at least one monomer represented by the following general formula:
- ##STR51## wherein R.sup.1 stands for a hydrogen atom or a methyl group, and R.sup.4 stands for a linear fluoroalkyl group not containing an etheric oxygen atom and having 2 to 14 carbon atoms,
- and (2) at least one monomer represented by the following general formula:
- ##STR52## wherein R.sup.1 is as defined above, and R.sup.5 stands for a linear fluoroalkyl group containing an etheric oxygen atom or a branched fluoroalkyl group which may contain an etheric oxygen atom, said group R.sup.5 having 3 to 14 carbon atoms,
- said copolymer having a monomer ratio of the monomer (2) ranging from 5 to 40 mole % and a fluorine content of at least 50% by weight.
A reflection-preventive pellicle film comprising a transparent film of a cellulose derivative and a reflection-preventive layer of a polyfluoro(meth)acrylate formed on one or both of the surfaces of the transparent film, wherein said polyfluoro(meth)acrylate is a copolymer of (1) at least one monomer represented by the following general formula:
- ##STR53## wherein R.sup.1 stands for a hydrogen or methyl group, and R.sup.2 stands for a fluoroalkyl group which may contain an intermediate etheric oxygen atom,
- and (2) at least one monomer represented by the following general formula:
- ##STR54## wherein R.sup.1 is as defined above, and R.sup.6 stands for an alkyl group,
- said copolymer having a mixing ratio of the monomer (2) ranging from 5 to 40 mole % and fluorine content of at least 50% by weight.
A reflection-preventive pellicle film comprising a transparent film of a cellulose derivative and a reflection-preventive layer of a polyfluoro(meth)acrylate formed on one or both of the surfaces of the transparent film, wherein said polyfluoro(meth)acrylate comprises a monomer represented by the formula of ##STR55##
Dependencies are inferred from the claim text.