Abstract: The invention relates to a method of producing a film comprising at least one layer of a thermoplastic fluoro-polymer and at least one layer of another polymer (A). The inventive method consists in using extrusion blow molding to coextrude a fluoro-polymer and polymer (A) which adhere to one another; with a layer of another thermoplastic polymer (B) such that it forms a layer which is adjacent to the fluoropolymer/polymer (A) layer According to the invention, the thermoplastic polymer (B) is incompatible with the fluoro-polymer and polymer (A) and has adequate extrudate behavior to support the layers of fluoro-polymer and/or polymer (A). Once the coextrudate has been cooled, by separating the layer(s) of (B), at least the film is recovered, said film comprising at least one layer of a polymer selected from among thermoplastic fluoro-polymers and polymers (A).

Abstract: The present invention relates to the use of films, formed from an adhesive layer and a layer (A), for coating articles made of a thermoset, the adhesive layer comprising, by weiqht: 0 to 60 parts of PVDE, 10 to 100 parts of functionalized PMMA, 0 to 50 parts of an acrylic elastomer and 0 to 4 parts of a UV absorber, the total making up 100 parts, the layer (A) comprising, as main constituents, 0 to 100 parts of PVDF per 100 to 0 parts of PMMA, respectively. This film may be manufactured by coextrusion and is then fixed to the thermoset, for example by hot pressing. The invention also relates to an SMC (Sheet Moulding Compound) multilayer structure comprising, in this order: a backing film, a crosslinkable composition (the precursor of the thermoset), the above adhesive layer and the above layer (A).

Abstract: The present invention relates to a structure successively comprising: a layer of barrier polymer, a tie layer comprising, the total being 100%: 1 to 80% of at least one polyethylene carrying epoxy functional groups, 99 to 20% of at least one viscous polymer compatible with the polyethylene carrying epoxy functional groups, a polyethylene layer, and optionally another tie layer and a layer of barrier polymer, the layers adhering in their respective contact zones. This structure is of use in preparing devices for the storage or transfer of fluids, in particular in motor vehicles. The invention also relates to these devices. These devices can be pipes, tanks, bottles or containers in which the layer of barrier polymer is in contact with the stored or transported fluid. These structures can comprise other layers composed of other materials.

Abstract: The present invention relates to a polyamide-based multilayer structure comprising in succession: an upper layer made of a transparent polyamide coming from the condensation: either of a lactam or of an ?,?-amino acid having at least 9 carbon atoms or of a diamine and of a diacid, at least one having at least 9 carbon atoms; a lower layer capable of adhering to the substrate and optionally, an intermediate tie layer (also called a central layer) between the upper layer and the lower layer, each of the layers exhibiting thermomechanical behaviour (strength as a function of temperature) sufficiently similar to allow the structure to be easily formed under the effect of the temperature. The invention also relates to the objects consisting of these substrates covered with these structures, the lower layer being placed against the substrate.

Abstract: A multiplayer acrylic film is presented having: a layer (A) made from a thermoplastic acrylic composition a layer (B) made from either a composition comprising a methacrylic (co)polymer and an impact modifying compound, or a composition prepared by sequential polymerization in aqueous emulsion of acrylate-based monomer systems, or a composition comprising a block copolymer, and a layer (C) made from a thermoplastic acrylic composition. The film is useful for coating a substrate (thermoplastic resin, thermosetting resin, etc.).

Abstract: A structure made of a fluoropolymer layer and directly attached to one of its sides a tie layer based on a polyamide which results from the condensation of at least one diacid and at least one diamine of the following formula (1): in which R1 represents H or -Z1-NH2 and Z1 represents an alkyl, a cycloalkyl or an aryl having up to 15 carbon atoms and R2 represents H or -Z2-NH2 and Z2 represents an alkyl, a cycloalkyl or an aryl having up to 15 carbon atoms, it being possible for R1 and R2 to be identical or different. The tie resin may also be a copolymer having polyamide blocks and polyether blocks, the polyamide blocks resulting from condensation of at least one diacid and at least one diamine of formula (1). The invention also relates to a structure comprising a fluoropolymer layer, the tie layer and a substrate layer, respectively, as well as to a structure comprising a tie layer, respectively.

Abstract: Multilayer acrylic film comprising: a layer (A) made from a thermoplastic acrylic composition comprising from 75 to 95% of a metliacrylic (co)polymer containing mostly methyl methacrylate units and from 5 to 25% of an impact modifier a layer (B) made from either a composition comprising a methacrylic (co)polymer and an impact modifying compound, or a composition prepared by sequential polymerization in aqueous emulsion of acrylate-based monomer systems, or a composition comprising, a block copolymer, and a layer (C) made from a thermoplastic acrylic composition comprising from 75 to 95% of a methacrylic (co)polymer containing mostly methyl methacrylate units and from 5 to 25% of an impact modifier. Use of the film for coating a substrate (thermoplastic resin, thermosetting resin, etc.).

Abstract: The present invention relates to a thermoformable multilayer film comprising in succession: an optional protective layer (A); a layer (B) comprising (the total being 100% by weight) 0 to 30% of a fluoropolymer (B1) and 100 to 70% of a functionalized polymer (B2) essentially consisting of alkyl (meth)acrylate units; a layer (C) based on an ethylene/alkyl (meth)acrylate/unsaturated epoxide copolymer; a polyolefin tie layer (D); the layers adhering to one another in their respective contact regions. This film is obtained by coextrusion or coating of the various layers, the layer (A) possibly being laminated using the standard technique for thermoplastics. This film is then used to cover various substrates, for example by injecting the substrate in the melt onto the multilayer film deposited in the bottom of an injection mould, the layer (B) or the optional layer (A) of the film being placed against the wall of the mould. The present invention also relates to the substrates coated with these films.

Abstract: The invention relates to a method of producing a film comprising at least one layer of a polymer selected from among thermoplastic fluoro-polymer and polymers (A). The inventive method consists in using extrusion blow moulding to coextrude the following: a) at least one layer of a thermoplastic fluoro-polymer and at least one layer of polymer (A); or b) at least one layer of a thermoplastic fluoro-polymer containing charges and optionally at least one other fluoro-polymer layer; or c) at least one layer of polymer (A), the layers extruded in a), b) or c) adhering to one another; d) a layer of another thermoplastic polymer (B) such that it forms a layer which is adjacent to the assembly of layers extruded in a), b) or c); e) optionally another layer of (B) which is adjacent to the assembly of layers extruded in a), b) or c) on the side opposite that of the layer extruded in d).

Abstract: A composition coextrudable with PVDF comprises in parts by weight: 20 to 40 parts of PVDF; 40 to 60 parts of PMMA; 5 to 18 parts of an acrylic elastomer; 1 to 4 parts of a UV absorber; the total making 100 parts. Coextruded films comprise a layer of the above coextrudable composition directly attached to the latter; and a PVDF-based layer comprising, as main constituents, 50 to 100 parts of PVDF per 50 to 0 parts of PMMA respectively. The PVDF layer may be in the form of two layers: one placed against the coextrudable layer and comprising, as main constituents, 50 to 90 parts of PVDF per 50 to 10 parts of PMMA respectively; and the other (also called the outer layer) comprising, as main constituents, 75 to 100 parts of PVDF per 25 to 0 parts of PMMA respectively. The resultant products are generally applied to substrates, e.g. as protective films.

Abstract: The present invention relates to the use of films, formed from an adhesive layer and a layer (A), for coating articles made of a thermoset, the adhesive layer comprising, by weight: 0 to 60 parts of PVDF, 10 to 100 parts of functionalized PMMA, 0 to 50 parts of an acrylic elastomer and 0 to 4 parts of a UV absorber, the total making up 100 parts, the layer (A) comprising, as main constituents, 0 to 100 parts of PVDF per 100 to 0 parts of PMMA, respectively.

Abstract: A composition coextrudable with PVDF comprises in parts by weight: 20 to 40 parts of PVDF; 40 to 60 parts of PMMA; 5 to 18 parts of an acrylic elastomer; 1 to 4 parts of a UV absorber; the total making 100 parts. Coextruded films comprise a layer of the above coextrudable composition directly attached to the latter; and a PVDF-based layer comprising, as main constituents, 50 to 100 parts of PVDF per 50 to 0 parts of PMMA respectively. The PVDF layer may be in the form of two layers: one placed against the coextrudable layer and comprising, as main constituents, 50 to 90 parts of PVDF per 50 to 10 parts of PMMA respectively; and the other (also called the outer layer) comprising, as main constituents, 75 to 100 parts of PVDF per 25 to 0 parts of PMMA respectively. The resultant products are generally applied to substrates, e.g. as protective films.

Abstract: The present invention relates to a thermoformable multilayer film comprising in succession: a protective layer (A); a transparent layer (B) comprising (by weight the total amount being 100%) 0 to 100% of a fluoropolymer (B1) and 100 to 0% of a polymer (B2) essentially consisting of alkyl (meth)acrylate units; a layer (C) based on a polyamide with amine terminal groups; a layer (D) consisting of a polyolefin functionalized by an unsaturated carboxylic acid anhydride; a bonding layer (E) made of a polyolefin, said film being obtained by coextruding the various layers, said film being used to cover various substrates, for example by injection-moulding the substrate in the melt onto the multilayer film placed in the bottom of an injection mould, the layer (A) of the film being placed against the wall of the mould.

Abstract: A structure made of a fluoropolymer layer and directly attached to one of its sides a tie layer based on a polyamide which results from the condensation of at least one diacid and at least one diamine of the following formula (1): 1

Abstract: A thermoforming multilayer film comprising successively: at least one layer chosen from layers A1 and A2, an optional layer B1, a layer B2, a layer B3, and an optional layer B4. A1 comprises a fluoropolymer A111 or a polymer A112 consisting essentially of alkyl(methyl)acrylate units or a blend of the two, layer A2 consists of ink, layer B1 comprises a fluoropolymer B111 or a polymer B112 consisting essentially of alkyl(meth)acrylate units or a blend of the two, layer B2 is based on a polyamide, layer B3 consists of polyolefin functionalized with unsaturated carboxylic anhydride and layer B4 comprises polyolefin. A process for producing the multilayer film comprising co-extrusion is described.

Abstract: The present invention relates to a thermoformable multilayer film comprising in succession:

Abstract: The invention relates to a process for melt extruding a film layer of a thermoplastic olefin which comprises extruding the film having physical characteristics under process conditions selected by reference to the Draw ratio Dr and the Aspect ratio A such that draw resonance is avoided in which in addition the process conditions are defined by reference to the Deborah number such that the molten polymer is extruded at a Draw ratio of at least 30 in a high elasticity region at a &lgr;c value of characteristic time as defined herein of from 0.001 to 0.6 s, a Deborah number as defined herein in excess of 0.005 and an A value as defined herein lower than 0.8. Narrower ranges of these parameters may be defined for application of the invention to different polymer types.

Abstract: The invention relates to a process for melt extruding a film layer of a thermoplastic olefin which comprises extruding the film having physical characteristics under process conditions selected by reference to the Draw ratio Dr and the Aspect ratio A such that draw resonance is avoided in which in addition the process conditions are defined by reference to the Deborah number such that the molten polymer is extruded at a Draw ratio of at least 30 in a high elasticity region at a &lgr;c value of characteristic time as defined herein of from 0.001 to 0.6 s, a Deborah number as defined herein in excess of 0.005 and an A value as defined herein lower than 0.8. Narrower ranges of these parameters may be defined for application of the invention to different polymer types.