Claims
- 1. A laminated material having excellent hot water resistance, excellent oxygen barrier property and excellent heat sealability in combination, which comprises (i) a layer composed of an olefin-vinyl alcohol-vinyl acetal copolymer and (ii) a layer composed of a heat-sealable resin, said olefin-vinyl alcohol-vinyl acetal copolymer consisting essentially of 10 to 50 mole % of olefin units and 90 to 50 mole % of vinyl units, 50 to 98 mole % of the vinyl units being vinyl alcohol units and 2 to 50 mole % of the vinyl units being at least one kind of vinyl acetal units selected from the group consisting of
- (A) units represented by the following formula: ##STR14## wherein R.sub.1 stands for a hydrogen atom or a monovalent aliphatic, aromatic or aliphatic-aromatic group,
- (B) units represented by the following formula: ##STR15## wherein R.sub.1 is as defined above, (C) units represented by the following formula: ##STR16## wherein R.sub.2 stands for a direct bond or a divalent aliphatic, aromatic or aliphatic-aromatic group, and
- (D) units represented by the following formula: ##STR17## wherein R.sub.2 is as defined above.
- 2. A laminate structure as set forth in claim 1 wherin the olefin units are ethylene units or ethylene units and up to 15 mole %, based on the ethylene units, of propylene units.
- 3. A laminate structure as set forth in claim 1 wherein said vinyl acetal units are units derived from glyoxal and represented by the following formula (C'): ##STR18## and/or units derived from glyoxal and represented by the following formula (D'): ##STR19##
- 4. A laminate structure as set forth in claim 1 or 3 wherein said copolymer consists essentially of 20 to 40 mole % of olefin units and 80 to 60 mole % of vinyl units, 70 to 95 mole % of the vinyl units being vinyl alcohol units and 5 to 30 mole % of the vinyl units being vinyl acetal units.
- 5. A laminate structure as set forth in claim 1 or 3 wherein the vinyl acetal units (D) are present in an amount of at least 1 mole % of the vinyl units.
- 6. A laminate structure as set forth in claim 1 or 3 wherein said heat-sealable resin is a polyolefin.
- 7. A laminate structure as set forth in claim 1 or 3 wherein said heat-sealable resin is an isotatic polypropylene.
- 8. A laminate structure as set forth in claim 1 wherein the heat-sealable resin layer (ii) is formed on one surface of said olefin-vinyl alcohol-vinyl acetal copolymer layer (i), said heat-sealable resin layer (ii) being composed of a polyolefin, and a heat-resistant resin layer (iii) composed of a resin having a melting or softening point higher than that of said polyolefin is formed on the other surface of said copolymer layer (i).
- 9. A laminate structure as set forth in claim 8 wherin said heat-resistant resin layer (iii) is composed of a polyester.
- 10. A laminate structure as set forth in claim 1 wherein other resin layer (iv) is formed between said copolymer layer (i) and said heat-sealable resin layer (ii).
- 11. A laminate structure as set forth in claim 8 wherein other resin layer (iv) is formed between said copolymer layer (i) and said heat-sealable resin layer or said copolymer layer (i) and said heat-resistant resin layer (iii).
Priority Claims (2)
Number |
Date |
Country |
Kind |
51-140749 |
Nov 1976 |
JPX |
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51-140750 |
Nov 1976 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 854,007 filed Nov. 22, 1977.
US Referenced Citations (7)
Foreign Referenced Citations (5)
Number |
Date |
Country |
49-8950 |
Mar 1974 |
JPX |
50-34682 |
Apr 1975 |
JPX |
831931 |
Apr 1960 |
GBX |
1212569 |
Nov 1970 |
GBX |
1436362 |
May 1976 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
854007 |
Nov 1977 |
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