Multi-layer laminates and uses thereof

Details Multi-layer laminates and uses thereof Multi-layer laminates and uses thereof

1996-12-31

2000-12-26

Chen, Vivian

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 357, 428 367, 428500, 428515, 428516, 428518, 428520, 428522, 428523, 526280, 526281, 526283, B32B 2708, B32B 2706, B32B 2730, B32B 2732

Patent

active

061655732

DESCRIPTION:

BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION

This application is the National Phase entry under 35 USC 371, of International PCT application PCT/JP95/01331, filed Jul. 4, 1995, and designating the United States.


TECHNICAL FIELD

The present invention relates to multi-layer laminates which comprise a cycloolefin resin layer and a polymer layer and have a low oxygen permeability. The invention also relates to uses of the multi-layer laminates.


BACKGROUND ART

Packaging materials for daily necessaries, general merchandise, foods, tablet drugs, etc. are required to have various properties such as transparency, moisture resistance, heat-sealing properties, vacuum or pressure formability and twist-wrapping properties. However, use of only one kind of a resin cannot meet these requirements. Therefore, multi-layer laminates each comprising a sheet or a film of a certain resin and a sheet or a film of other resin with different properties have been widely employed. Also in the field of packaging materials, recycling of raw materials or incineration of the packaging materials has been recently paid much attention. From this viewpoint, polyolefin resins tend to be preferably employed as the packaging materials.
Of the polyolefin resins, cycloolefin resins are particularly suitable for the packaging materials, because they have excellent transparency, moisture resistance, vacuum or pressure formability and dead fold properties and they can be recycled or incinerated without any problem. However, since the cycloolefin resins are amorphous, they rapidly soften at temperatures close to their glass transition temperatures to cause lowering of elastic modulus and strength. Therefore, the molding conditions in the processes of heat-sealing, inflation and vacuum or pressure forming are restricted.
Meanwhile, the packaging materials used for packaging foods are desired to have low oxygen permeability because the objects packaged by the packaging materials easily deteriorate when they are brought into contact with oxygen of air. The cycloolefin resins have excellent properties as the packaging materials, e.g., high moldability and transparency. However, in the uses where high oxygen barrier properties are required, for example, in the uses for food-packaging, they are desired to be further improved in these properties.
Containers using thermoplastic resins are described in, for example, Japanese Patent Publication No. 104732/1994 and Japanese Patent Laid-Open Publication No. 1352/1984. These publications disclose laminating of an ethylene/vinyl alcohol copolymer (EVOH) and other thermoplastic resin, and the thermoplastic resins laminated together with the EVOH are, for example, polyesters such as PET and polyamides such as nylon. Japanese Patent Laid-Open Publication No. 293159/1993 discloses a container made of a laminate of a resin and EVOH, and the resin used herein is a hydrogenation product of a ring opening polymer of a cycloolefin.
It is an object of the present invention to provide a multi-layer laminate which has excellent formability, transparency, interlaminar bond properties, moisture resistance, flexibility, tearability, heat-sealing properties and dead fold properties and which is well-balanced between oxygen permeability and transparency. It is another object of the invention to provide a film, a sheet and a packaging material each of which is formed from the multi-layer laminate.


DISCLOSURE OF THE INVENTION

The multi-layer laminate of the invention comprises: group consisting of represented by the following formula [1] or [2] and ethylene and (a-1), or cycloolefin resin selected from the group consisting of the ethylene/cycloolefin random copolymer (a-1) and the graft modified product (a-2) and (b) a polyolefin, and temperature of 23.degree. C. and RH of 0%, of not more than 10 cc(STP).mm/m.sup.2.24 hr.atm, 0.2 g.mm/m.sup.2.24 hr.atm and an oxygen permeability of not more than 5 cc(STP).mm/m.sup.2.24 hr.atm; ##STR1## wherein n is 0 or 1; m is 0 or a positive integer; q is 0 or 1; R.sup.1 to R.sup.18, R.sup.a

REFERENCES:
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