Polyester film for thermal lamination
AssigneeToray Industries, Inc.
InventorsMasahiro Kimura, Shiro Imai
Life of this patent
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Abstract
A polyester film for thermal lamination, comprising: a polyester A of 140.degree. to 245.degree. C. in melting point mainly composed of ethylene terephthalate and/or ethylene isophthalate, a thermoplastic elastomer mixed at a ratio by weight of 81:19 to 98:2 with the elastomer comprising particles having a particle size ratio of 2 to 100 is excellent not only in formability but also in act resistance and taste property, and hence ideal for application on to the inner faces of packages, containers, etc.
Claims26
A polyester film for laminating onto a metallic sheet, comprising:
- a polyester A having a melting point of 140.degree. to 245.degree. C. comprising a polymer or copolymer of ethylene terephthalate and/or ethylene isophthalate, and a thermoplastic elastomer mixed and dispersed in polyester A at a ratio by weight of 81:19 to 98:2, said elastomer comprising particles having a particle size ratio of 2 to 100;
- wherein the particle size ratio is the ratio of the average particle size in the longitudinal direction to the average particle size in the thickness direction, and
- a second layer B laminated to said layer A and made of a polyester B composed mainly of ethylene terephthalate and having a melting point of 220.degree. to 260.degree. C.
A polyester film metallic can liner comprising:
- a polyester A having a melting point of 140.degree. to 245.degree. C. comprising a polymer or copolymer of ethylene terephthalate and/or ethylene isophthalate, and a thermoplastic elastomer mixed and dispersed in polyester A at a ratio by weight of 81:19 to 98:2, said elastomer comprising particles having a particle size ratio of 4 to 50, wherein the particle size ratio is the ratio of the average particle size in the longitudinal direction to the average particle size in the thickness direction, and
- a second layer B laminated to said layer A and made of a polyester B composed mainly of ethylene terephthalate and having a melting point of 220.degree. to 260.degree. C.
A two-layer polyester film,
- a first layer which comprises (I) a polyester A having a melting point of 140.degree. to 245.degree. C. comprising a polymer or copolymer of ethylene terephthalate and/or ethylene isophthalate, and (II) a thermoplastic elastomer selected from the group consisting of styrene block copolymer and ethylene-propylene copolymer, said elastomer being mixed and dispersed in polyester A at a ratio by weight of 97.5:2.5 to 90:10 with said elastomer comprising particles having a particle size ratio of 2 to 100, wherein the particle size ratio is the ratio of the average particle size in the longitudinal direction to the average particle size in the thickness direction, and
- a second layer B laminated to said first layer A and comprising a polyester composed mainly of ethylene terephthalate and having a melting point of 220.degree. to 260.degree. C.
Dependencies are inferred from the claim text.