Multilayer structure

Details Multilayer structure Multilayer structure

1988-06-20

1990-06-19

Lesmes, George F.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428500, 525 92, C08L 6700, B32B 2708, B32B 2736

Patent

active

049353098

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a multilayer structure comprising at least two layers with
(a) at least one layer, comprising a polyalkylene phtalate ester film.
Multilayer structures comprising at least one layer comprising a polyalkylene phtalate ester film are general known.
FR-A-2445223 describes multilayer structures comprising one layer of a polybutyleneterephtalate and one layer of a rubber modified polystyrene, bonded together by a bonding layer consisting of a special type of block copolymer (example 4-12).
In manufacturing multilayer structures it is preferred to make structures not needing a special bonding layer.
EP-A-0121883 describes multilayer structures built up from several layers in which at least one layer consists substantially of a mixture of a poly(1,4-butylene-terephthalate) having an extraordinarily high intrinsic viscosity of more than 1.5 parts/g and an amorphous copolyester copolymer built up from 1,4-cyclohexanedimethanol units, optionally ethylene glycol units and terephthalic acid or a mixture of terephthalic acid and isophthalic acid. A second layer may consist of poly(alkylene terephthalates), polycarbonates, poly(arylsulphones), polyacrylates, polymethacrylates, polyurethanes, polyamides, polyimides, polyamideimides, polyesterimides, polyesteramides, thermoplastic polymers and the like. The second layer preferably consists of a polycarbonate. According to EP-A-0121883 the above-mentioned mixture consisting of polybutylene terephthalate and the amorphous copolyester copolymer has good barrier properties and it can readily be processed in extrusion-coinjection-blow moulding. It is stated in EP-A-0121883 that layers of the above-mentioned mixture can readily be bonded to layers substantially consisting of other thermoplastic materials without the use of extra bonding layers.
EP-A-0121883 therefore uses instead of a bonding layer a very special polyalkylene terephtalate based composition.
EP-A-0128425 describes multilayer structures comprising one PET base layer and one foamed polystyrene layer. It has been indicated that the PET layer can be laminated on the foam layer by thermal adhesion or through a bonding layer.
It has now been found that a polyalkylene terephtalate based film can be readily adhered onto a polystyrene or rubber modified polystyrene film without using a bonding layer.
The multilayer structure according to the invention can therefore be characterised in that it comprises besides the above mentioned layer (a) b) at least one layer substantially consisting of a polystyrene film or a rubber modified polystyrene film, the layers (a) and (b) being juxtaposed and being bonded together by thermal adhesion without using a bonding layer.
It is not an object of the invention to obtain rights for the structures which comprise a layer built up from a mixture of a polybutylene terephthalate having an intrinsic viscosity of more than 1.5 parts/g and an amorphous copolyester as described in EP-A-0121883.
It is possible to obtain a further improved bonding between the layers (a) and (b) when layer (a) consists of a film out of a polyalkylene phthalate ester which is mixed with a functionalised polystyrene.
The structure according to the invention comprises at least one layer (a) as defined hereinbefore. Layer (a) consists of a film out of a material comprising more than 50% by weight, preferably more than 80% by weight, calculated with respect to the sum of all polymeric constituents, one or more polyalkylene phthalate esters, optionally in combination with a functionalised polystyrene.
Polyalkylene phthalate esters are compounds known per se. They are built up from units derived from one or more diols and one or more phthalic acids. Examples of suitable diols are ethanediol, butanediol, hexanediol, cyclohexanedimethanol, diethylene glycol, triethylene glycol and etherdiol compounds of the general formula H--0--[(CH.sub.2).sub.n --0]--.sub.m H. Suitable phthalic acids are terephthalic acid and isophthalic acid. As phthalic acids are particularly suitable terephthalic acid and isop

REFERENCES:
patent: 3644574 (1972-02-01), Jackson
patent: 4563381 (1986-01-01), Woodland
patent: 4684578 (1987-08-01), Inoue

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