Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-08-01
1998-08-18
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525217, 525230, 5253305, C08F 832
Patent
active
057959390
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an adhesion binder containing glutarimide moieties and its application as a barrier material. It relates more particularly to the coextrusion with a layer or a film of fluorinated polymer and especially of polyvinylidene fluoride (PVDF).
PRIOR ART
EP 3,449 describes the coextrusion of PVDF with polyurethanes (PU); it is not necessary to use a binder. FR 2,436,676 describes the coextrusion of PVDF with polymethyl methacrylate (PMMA) and a poly(acrylonitrile-butadiene-styrene) (ABS), the PMMA film being between the PVDF and ABS films. Another example has been made with polyvinyl chloride (PVC) in place of ABS. EP 450,994 describes an improvement to the above technique, which uses as coextrusion binder the mixture: 100 parts, and
This improvement increases the adherence of PVDF to ABS.
However, no coextrusion binder exists which is satisfactory for bonding a PVDF film to polyamide or to a product based on polyamide.
DESCRIPTION OF THE INVENTION
The Applicant has now found that a polymer A which contains the following moieties: ##STR1## in which R.sub.1 and R.sub.2, which may be identical or different, represent H or a linear or branched alkyl having from 1 to 20 carbon atoms ##STR2## in which (i) R.sub.4 and R.sub.5, which may be identical or different, represent H or a linear or branched alkyl having 1 to 20 carbon atoms, (ii) R.sub.3 represents H, an alkyl, cycloalkyl, aryl, alkaryl, aralkyl or a heterocycle ##STR3## in which R.sub.6 represents H or a linear or branched alkyl having from 1 to 20 carbon atoms ##STR4## in which R.sub.7 represents H or a linear or branched alkyl having from 1 to 20 carbons and R.sub.8 represents a linear or branched alkyl having from 1 to 20 carbon atoms, is an adhesion binder for polyvinylidene fluoride (PVDF) which allows it to adhere to polymers which are incompatible with it. Polymer A may for example be a derivative of PMMA. It may be obtained by reaction of PMMA with ammonia or amines. Other polymers A and their preparation processes are described in EP 216,505. The moieties 3 advantageously represent less than 20% and preferably from 1 to 6% by weight of copolymer A.
Among the fluorinated polymers according to the invention, there may be mentioned: chlorotrifluoroethylene (CTFE), tetrafluoroethylene (TFE), hexafluoropropene (HFP) and/or ethylene moieties and optionally VF2 and/or VF3 moieties. By way of example, there may be mentioned polytetrafluoroethylene (PTFE) and poly(ethylene-tetrafluoroethylene) (ETFE).
Fluorinated polymer is also understood to refer to mixtures of at least 70% by weight of the above with other polymers.
Among the fluorinated polymers, the homo- and copolymers of vinylidene fluoride possessing at least 70% by weight of VF2 residues, denoted throughout the text by PVDF, are advantageously used. PVDF is also understood to refer to the mixtures of the above with at least one other thermoplastic polymer, on condition that at least 50% by weight of VF2 moieties are present in the mixture.
Among the polymers which are incompatible with the fluorinated polymers, especially PVDF, there may for example be mentioned polyamides, copolyamides or polyamide alloys, on their own or as a mixture. By way of example of polyamides (PA), PA-4,6, PA-6,6, PA-6, PA-6,12, PA-11, PA-12 and PA-12,12 or their mixtures may be mentioned. The polyamide alloys may be those consisting of a polyamide matrix in which are dispersed particles of another polymer, such as those described in the U.S. Pat. No. 4,174,358. The polyamides may contain plasticizers. The invention also relates to mixtures of polymer A with a polymer in order to lower its modulus of elasticity. In fact, the binder consisting of polymer A is too rigid for certain applications; it is useful to mix it with another polymer in order to render it less rigid. The amount of this polymer is chosen according to the desired rigidity. Fluorinated polymer modified by elastomers or a polymer which is compatible with polymer A may be used. The binder according to the
REFERENCES:
patent: 4272585 (1981-06-01), Strassel
patent: 5019444 (1991-05-01), Duperray et al.
Elf Atochem S.A.
Lipman Bernard
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