Laminated polyester film
AssigneeToyo Boseki Kabushiki Kaisha
InventorsKoji Yamada, Yasushi Sasaki, Toshitake Suzuki, Shinya Higashiura, Chikao Morishige
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Abstract
A laminated polyester film comprising a polyester base film and a layer comprising a polyester graft copolymer and which is formed at least on one surface of said polyester base film, said polyester graft copolymer comprising a hydrophobic copolymerizable polyester resin and an acid anhydride having at least one double bond grafted to said polyester resin. The laminated polyester film of the present invention exhibits good adhesive property, water resistance and resistance to blocking, particularly excellent adhesive property, by applying a specific polyester graft copolymer to a polyester base film.
Claims14
A laminated polyester film comprising a polyester base film and a layer comprising a polyester graft copolymer and which is formed at least on one surface of said polyester base film, said polyester graft copolymer comprising a hydrophobic copolymerizable polyester resin and an acid anhydride having at least one double bond grafted to said polyester resin, wherein said layer is in the range of 0.01-1 g/m2.
A laminated polyester film comprising a stretched polyester base film and a layer comprising a polyester graft copolymer on at least one surface of said polyester base film, said polyester graft copolymer being a product of a reaction between a hydrophobic copolymerizable polyester resin and at least one polymerizable unsaturated monomer grafted to said polyester resin, wherein said layer is in the range of 0.01-1 g/m2 and has a hydrogen bonding component of surface energy, γsh, of not more than 35 erg/cm2, said laminated polyester film being formed by
- (1) applying a coating solution comprising the polyester graft copolymer on at least one surface of said polyester base film to form the layer comprising the graft copolymer;
- (2) stretching said polyester base film;
- and
- (3) curing the laminated polyester film.
A laminated polyester film comprising a stretched polyester base film and a layer comprising a polyester graft copolymer on at least one surface of said polyester base film, said polyester graft copolymer being a product of a reaction between a hydrophobic copolymerizable polyester resin and an acid anhydride having at least one double bond grafted to said polyester resin, wherein said layer is in the range of 0.01-1 g/m2 and has a hydrogen bonding component of surface energy, γsh, of not more than 35 erg/cm2.
Dependencies are inferred from the claim text.