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Polyester film for thermal lamination
| Details |
Inventors: Kimura, Masahiro; Imai, Shiro;
Assignee: Toray Industries, Inc. (JP)
Primary Examiner: Chen; Vivian
Assistant Examiner:
Attorney, Agent or Firm: Miller; Austin R.
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. |
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DETAILED DESCRIPTION OF THE INVENTION The polyester A in the present invention must have ethylene terephthalate and/or ethylene isophthalate as a main component to prevent the adsorption of the fragrance ingredient of the content.
It refers to a polyester, not less than 70 mol % of which is composed of ethylene terephthalate and/or ethylene isophthalate.
If the ethylene terephthalate and/or ethylene isophthalate content is less than 70 mol %, the adsorption of the fragrance ingredient cannot be perfectly prevented, and heat resistance, formability, etc.
are lowered.
The polyester can contain other copolymer components so long as the intended properties are not impaired.
The dicarboxylic acid component can be selected, for example, from aromatic dicarboxylic acids such as naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenylsulfonedicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sodiumsulfoisophthalic acid and phthalic acid, aliphatic dicarboxylic acids such as oxalic acid, succinic acid, adipic acid, sebacic acid, dimer acid, maleic acid and fumaric acid, alicyclic dicarboxylic acids such as cyclohexynedicarboxylic acid, hydroxycarboxylic acids such as p-hydroxybenzoic acid.
On the other hand, the glycol component can be selected, for example, from aliphatic glycols such as propanediol, butanediol, pentanediol, hexanediol and neopentyl glycol, alicyclic glycols such as cyclohexanedimethanol, aromatic glycols such as bisphenol A and bisphenol S, diethylene glycol, polyalkylene glycols, etc.
Respectively two or more of these carboxylic acid components and glycol components can also be used together.
As far as the effect of the present invention is not impaired, the copolymerized polyester can also have a polyfunctional compound such as trimellitic acid, trimesic acid or trimethylolpropane copolymerized.
Diethylene glycol is generated as a byproduct in the production of the polyester A, and it is preferable that diethylene glycol is contained by 0.
01 to 1.
0 wt %, more preferably 0
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Nonmetallic Processes 
