Polyester film composite, light-diffuser plate and utilization thereof
AssigneeTeijin Limited
InventorsKei Mizutani, Takashi Saigo, Masayuki Fukuda
Life of this patent
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Abstract
A polyester film composite material comprising a biaxially oriented polyester film having a thickness of 5 at least 50 gm but not more than 200 gm and an easy-adhesion coating applied onto one or each surface thereof, and having a haze value of less than 2% and a total light transmissivity of at least 90%, and a light-diffusing plate comprising a light-diffusing layer 10 laminated on the surface of the easy-adhesion coating thereof. According to the present invention, a light-diffusing plate having excellent optical properties when used in a liquid crystal display and a substrate 15 therefor are provided.
Claims22
A polyester film composite material comprising a biaxially oriented polyester film having a thickness of at least 50 μm but not more than 200 μm and an easy-adhesion coating applied onto one or each surface thereof, and having a haze value of less than 2% and a total light transmissivity of at least 90%,
- wherein the biaxially oriented polyester film is a single-layered polyester film or a laminated polyester film,
- and a polyester constituting a single layer or at least an outer film of a laminated film in said biaxially oriented polyester film contains at least 0.001% by weight but not more than 0.1% by weight of porous silica particles and/or plate-like aluminum silicate particles having an average particle diameter of at least 0.1 μm but not greater than 3 μm,
- and said easy-adhesion coating has a composition composed, substantially of (A) a water-base polyester resin having a glass transition point of 40 to 80° C., (B) an acrylic resin having a glass transition point of 25 to 75° C. and (C) acrylic crosslinked polymer particles.
A polyester film composite material comprising
- (I) a biaxially oriented polyester film formed of polyethylene terephthalate containing at least 0.001% by weight but not more than 0.1% by weight of porous silica particles and/or plate-like aluminum silicate particles having an average particle diameter of at least 0.1 μm but not greater than 3 μm, and
- (II) a coating composition substantially containing (A′) a water-base polyester containing 8 to 20 mol %, based on the content of total dicarboxylic acid components, of a dicarboxylic acid component having a group of —SO3M (in which M is a metal atom, ammonium salt or quaternary phosphonium salt) in its molecule and having a glass transition point of 40 to 80° C., (B) an acrylic resin having a glass transition point of 25 to 75° C. and (C) acrylic crosslinked polymer particles.
- (III) the biaxially oriented polyester film having a structure in which a coating of said coating composition is formed on both the surfaces of said biaxially oriented polyester and having a haze value of less than 2% and a total light transmissivity of at least 90%.
A polyester film composite material comprising
- (I) a biaxially oriented polyester film formed of polyethylene terephthalate containing at least 0.001% by weight but not more than 0.1% by weight of porous silica particles and/or plate-like aluminum silicate particles having an average particle diameter of at least 0.1 pm but not greater than 3 μm, and
- (II) a coating composition substantially containing (A′) a water-base polyester containing 8 to 20 mol %, based on the content of total dicarboxylic acid components, of a dicarboxylic acid component having a group of —SO3M (in which M is a metal atom, ammonium salt or quaternary phosphonium salt) in its molecule and having a glass transition point of 40 to 80° C., (B) an acrylic resin having a glass transition point of 25 to 75° C., (C) acrylic crosslinked polymer particles and (D) an aliphatic amide and/or aliphatic bisamide,
- (III) the biaxially oriented polyester film having a structure in which a coating of said coating composition is formed on both the surfaces of said biaxially oriented polyester and having a haze value of less than 2% and a total light transmissivity of at least 90%.
A polyester film composite material comprising
- (I) a polyester film that is a laminated biaxially oriented polyester film formed of laminated two or three laminated layers formed of polyethylene terephthalate, said film being a film wherein a polyester layer (Y) containing at least 0.001% by weight but not more than 0.1% by weight of porous silica particles and/or plate-like aluminum silicate particles having an average particle diameter of at least 0.1 μm but not greater than 3 μm is laminated on each surface or one surface of a polyester film layer (X) having an inert-fine-particles content of 0.005% by weight or less, and
- (II) a coating composition substantially containing (A′) a water-base polyester containing 8 to 20 mol %, based on the content of total dicarboxylic acid components, of a dicarboxylic acid component having a group of —SO3M (in which M is a metal atom, ammoniuni salt or quatemary phosphonium salt) in its molecule and having a glass transition point of 40 to 80° C., (B) an acrylic resin having a glass transition point of 25 to 75° C., and (C) acrylic crosslinked polymer particles,
- (III) the biaxially oriented polyester film having a structure in which a coating of said coating composition is formed on both the surfaces of said biaxially oriented polyester and having a haze value of less than 2% and a total light transmissivity of at least 90%.
Dependencies are inferred from the claim text.