Packaging material comprising a silicon oxide layer and a polyol

Details Packaging material comprising a silicon oxide layer and a polyol Packaging material comprising a silicon oxide layer and a polyol

1996-02-27

1998-03-24

Nakarani, D. S.

Stock material or miscellaneous articles

Composite

Of silicon containing

428451, 428480, 428520, B32B 2730, B32B 2732, B32B 2736

Patent

active

057310920

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

The present invention relates to a packaging material comprising a silicon oxide layer and a polyolefin layer.
It more particularly relates to a structure comprising a film covered with silicon oxide and a polyolefin film, an adhesive binder being arranged between the silicon oxide and the polyolefin film. It is possible, for example, as regards the polyolefin film, to hot-bond this material to cardboard and then to cover each face of the combined unit obtained with a polyethylene sheet.
These materials are useful for manufacturing packagings for liquid foodstuffs in the form of cartons.
JP 03099842 (Kokai), published on 25 Apr. 1991, describes EVOH/vinylsilane films covered with silicon oxide, on which films is bonded a polypropylene sheet using a urethane adhesive.
JP 05330568 (Kokai), published on 14 Dec. 1993, describes polyester, films covered with silica, on which films is bonded a sheet of ethylenic resin using an adhesive which is an ethylene-maleic anhydride-ethyl acrylate copolymer.
It has now been found that it is possible to obtain materials which cannot be delaminated, by using binders based on polyolefins grafted with silanes or epoxides.
The present invention is a material comprising a film covered with silicon oxide and a polyolefin film such that the binder arranged between the silicon oxide and the polyolefin film is chosen from:
The film covered with silicon oxide is known in the prior art. It is, for example, a film of polyester such as poly(ethylene terephthalate) (PET) or poly(butylene terephthalate) (PBT) or polyamide (PA).
The polyolefin film is made of polyethylene, polypropylene or copolymers of ethylene, such as, for example, ethylene-propylene, ethylene-butene, ethylene-hexene, ethylene-alkyl (meth)acrylate or ethylene-vinyl acetate copolymers.
As regards the binder, the polyolefins which are grafted with alkoxysilanes can be chosen from: group of the alkyl (meth)acrylate has up to 10 carbon atoms and can be linear, branched or cyclic. Mention may be made, by way of illustration of the alkyl (meth)acrylate, of in particular n-butyl acrylate, methyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, methyl methacrylate or ethyl methacrylate. Preference is given, among these (meth)acrylates, to ethyl acrylate, methyl acrylate, n-butyl acrylate and methyl methacrylate; derived from ethylene, propylene, butene or hexene. Use is advantageously made either of ethylene-propylene-butene copolymers with a high butene content or of ethylene-propylene-butene copolymers with a high propylene content or of homo- or copolymers of butene.
Use is advantageously made of ethylene-alkyl (meth)acrylate copolymers.
Mention may be made, among alkoxysilanes carrying an unsaturation, of: OR.sub.3 in which R.sub.2 and R.sub.3 are alkyls having at most 5 carbon atoms for the combined unit R.sub.2 and R.sub.3 ;
Use is made, for example, of vinylsilanes, such as trimethoxyvinylsilane, triethoxyvinylsilane, tripropoxyvinylsilane, tributoxyvinylsilane, tripentoxyvinylsilane or tris(.beta.-methoxyethoxy)vinylsilane, allylsilanes, such as trimethoxyallylsilane, triethoxyallylsilane, tripropoxyallylsilane, tributoxyallylsilane or tripentoxyallylsilane, or acrylsilanes, such as acryloxymethyltrimethoxysilane, methacryloxymethylmethoxysilane, acryloxyethyltrimethoxysilane, methacryloxyethyltrimethoxysilane, acryloxypropyltrimethoxysilane, methacryloxypropyltrimethoxysilane, acryloxybutyltrimethoxysilane, methacryloxybutylmethoxysilane, acryloxyethyltriethoxysilane, methacryloxyethyltriethoxysilane, methacryloxyethyltripropoxysilane, acryloxypropyltributoxysilane or methacryloxypropyltripentoxysilane.
It is also possible to use mixtures of these products.
Use is preferably made of: (VTEO) vinyltrimethoxyethoxysilane (VTMOEO) .dbd.C(CH.sub.3)--CO--O--(CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3.
The polyolefins can be grafted in the molten state in the presence of radical initiator(s).
The grafting reaction is carried out in a single- or twin-screw extruder fed with polyolefins in a fee

REFERENCES:
patent: 3306800 (1967-02-01), Plueddemann
patent: 4364731 (1982-12-01), Norling et al.
patent: 5458980 (1995-10-01), Larson
Abstract in English of JP-A-05 330 568, Dec. 14, 1993, see Derwent 94-022559 (03) to Yamato Estron KK.

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