JP2019510104A5 - - Google Patents

Claims (21)

At least one layer contains (a) an alkali metal phosphate in an amount of 1.3 mol / ton to 3.0 mol / ton with respect to the polyester resin P1, and phosphoric acid in an amount of 0.4 to 1.5 times mol of the alkali metal phosphate. A polyester film comprising 0.1-99.9% by weight of a polyester resin P1 and 0.1-2% by weight of a silicone resin containing (b) a polydimethylsiloxane resin, wherein the polyester film contains butylene terephthalate. 2. The polyester film according to claim 1, wherein the polyester resin P1 contains an aromatic polyester.    3. The polyester film according to claim 2, wherein the aromatic polyester contains at least 50% by weight of ethylene terephthalate as a constituent of the aromatic polyester.    The polyester film of claim 1, wherein the at least one layer comprises an outer release layer having a food area coverage of about 10% or less as measured according to a food release test (food release test). A polyester film containing no bisphenol A,
Said at least one layer comprises an outer release layer, said layer comprising (a) a heat-sealable layer B consisting of 0.1-100% by weight of a polyester resin P2, wherein the polyester resin P2 is crystallizable; Unlike polyester resin P1, (b) an amorphous copolyester resin or polyester resin having a melting point of at least 20 ° C. lower than 0.1-100% by weight of polyester resin P2, and (c) 0.1-15% by weight The polyester film according to claim 1, further comprising an antiblocking agent containing organic or inorganic particles. The polyester film according to claim 5, further comprising a heat-sealable layer C having the same or substantially the same composition as the heat-sealable layer B.    The polyester film according to claim 5, further comprising a heat-sealable layer C having a different composition from the heat-sealable layer B.    The polyester film according to claim 5, wherein the polyester P2 comprises an aromatic polyester.    The polyester film according to claim 6, wherein the polyester resin P2 contains an aromatic polyester.    The polyester film according to claim 5, wherein the polyester resin P2 contains at least 50% by weight of ethylene terephthalate as a constituent of the polyester resin P2.    The polyester film according to claim 6, wherein the polyester resin P2 contains at least 50% by weight of ethylene terephthalate as a constituent of the polyester resin P2. The polyester film according to claim 5 , wherein the polyester resin having a melting point of at least 20 ° C lower than the polyester resin P2 comprises butylene terephthalate. The polyester film of claim 5, wherein said at least one layer has a food area coverage of about 10% or less as measured according to a food release test. 7. The polyester film of claim 6, wherein the at least one layer comprises an outer release layer having a food area coverage of about 10% or less as measured according to a food release test.    A laminated metal sheet comprising the polyester film according to claim 1.    A laminated metal sheet comprising the polyester film according to claim 5.    A laminated metal sheet comprising the polyester film according to claim 6. 15. The laminated metal sheet according to claim 14, wherein the at least one layer comprises an outer release layer having a hood area coverage of no more than about 10% as measured according to a food release test.    16. The laminated metal sheet of claim 15, wherein the outer release layer has a food area coverage of less than or equal to about 10% as measured according to a food release test.    17. The laminated metal sheet according to claim 16, wherein the outer release layer has a food area coverage of about 10% or less as measured according to a food release test. The polyester film of claim 1, wherein the silicone resin has a kinematic viscosity in the range of 10-50 × 10 ⁶ centistokes at room temperature.