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Polyester, adhesives comprising the same, and laminates and laminated hollow vessels made thereof
| Details |
Inventors: Murata, Yoshifumi; Igi, Keishiro; Narukawa, Hiroshi; Uetsuki, Masao; Bando, Satoshi; Kawai, Shuji; Shirano, Kenji;
Assignee: Kuraray Co., Ltd. (Kurashiki, JP)
Primary Examiner: Lesmes; George F.
Assistant Examiner: Buffalow; E. Rollins
Attorney, Agent or Firm: Kramer; Barry
An aluminum atom- and monocarboxylic acid residue-containing polyester is provided. Using the polyester as an adhesive or a base, laminates and laminated hollow vessels which comprise, as the constituent elements, the polyester and an ethylene-vinyl alcohol copolymer can be produced. The laminates and laminated hollow vessels are suitable for use as packaging materials or containers for food and drink. |
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DETAILED DESCRIPTION An object of the present invention is to provide a novel polyester superior in adhesion and an adhesive comprising such polyester.
Another object of the present invention is to provide a laminate or laminated hollow vessel made of a polyester such as polyethylene terephthalate and an ethylene-vinyl alcohol copolymer adhered together by means of said adhesive.
A further object of the present invention is to provide a laminate or laminated hollow vessel made of the above novel polyester, which serves as a base, and an ethylene-vinyl alcohol copolymer adhered together by means of a carboxyl-containing polyolefin adhesive.
The above objects are accomplished by providing a thermoplastic polyester comprising the constituent units represented by the following formulas (I), (II), (III) and (IV): ##STR1## wherein R.
sub.
1, in its repeated occurrence in said polyester, represents one or more divalent groups each derived from a dicarboxylic acid selected from the group consisting of terephthalic acid, isophthalic acid, orthophthalic acid and a straight-chained aliphatic dicarboxylic acid containing 4 to 10 carbon atoms by removal of both carboxyl groups therefrom; R.
sub.
2, in its repeated occurrence in said polyester, represents one or more monovalent groups each selected from the group consisting of an aliphatic or alicyclic monocarboxylic acid containing 6 to 30 carbon atoms and an aromatic monocarboxylic acid containing 7-20 carbon atoms by removal of the carboxyl group therefrom, D, in its repeated occurrence in said polyester, represents one or more divalent groups each derived from a diol selected from the group consisting of an aliphatic diol containing 2 to 10 carbon atoms and an alicyclic diol containing 6 to 8 carbon atoms by removal of both hydroxyl groups therefrom, and m, n, p.
sub.
1, p.
sub.
2, p.
sub.
3 and q are each an integer of 0 or 1, said constituent units being bonded together in the combinations of (I)-(II), (I)-(III), (II)-(III), (II)-(IV), (III)-(III) and (III)-(IV) and via only one oxygen atom in each combination, the molar ratio (I):(II) being substantially 1:1, the molar ratio (I):(III) being in the range of 1,000:1 to 100:5 and the molar ratio (III):(IV) being in the range of 4:1 to 1:10, said polyester having an intrinsic viscosity of not less than 0
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Manufacturing Materials 
