Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Establissements Michelin

Milan Fedurco

Marco Ribezzo

Antonio Delfino

Wendelin Jan Stark

Robert Nikolaus Grass

Jean-Paul Meraldi

David Olsommer

Marcel Tornare

Alain Faugeras

Jean Paul Meraldi

A laminate comprising a first layer and a second layer directly covering the first layer, the first layer being a layer of a silicone rubber composition comprising a micrometric silicone powder and a mixture of crosslinkable organopolysiloxanes, the second layer being a layer of a silicone rubber composition comprising a hydrophobic silica and a mixture of crosslinkable organopolysiloxanes, is provided. The first layer and the second layer are crosslinked. The laminate, in particular when it is used as a coating for the outer surface of an expandable bladder for a tire curing mold, makes it possible to eliminate molding defects on the inner liner of the tire.

Laminate based on silicone rubber compositions

Use of a benzoxazine resin () for the bonding of a monofilament () made of glass-resin composite including glass filaments () embedded in a thermosetting polyester resin (), to a thermoplastic material (), notably polyester; process for adhering such a monofilament to the thermoplastic material (), including at least the following steps: —impregnating the monofilament () with a benzoxazine resin () in the liquid state; —after impregnation, heat-treating the monofilament () thus impregnated, so as to at least partly polymerize the benzoxazine resin (); —depositing, onto the monofilament () thus adhesively coated, the thermoplastic material () in the molten state; —after cooling, optionally heat-treating the monofilament thus coated (R-1, R-2) to totally polymerize the benzoxazine resin () on contact with the thermoplastic material ().

Bonding a glass-resin composite monofilament to a thermoplastic matrix

A process for depositing a metal-adhesive, hydrophobic and electrically conductive coating based on electrically conductive microparticles and on a polymer matrix P comprising at least one thermoplastic fluoropolymer P1 and a thermosetting resin P2, comprises: in a first container, dissolve the polymer P1 in an organic solvent; in a second container, disperse the electrically conductive microparticles in an organic solvent; add, in the first container, the thermosetting resin P2 in the liquid state; mix the contents of the containers, then deposit the mixture on the substrate; crosslink the resin P2 and remove the solvents, to obtain a first coating; then impregnate the surface of the substrate with an additional resin solution P2 dissolved in a third solvent, which is a solvent of the resin P2 and a non-solvent of the polymer P1; eliminate the third solvent and crosslink while compressing the additional resin P2 in order to obtain the targeted final coating.

Method for depositing an adhesive metal coating which is hydrophobic and electrically conductive

Multicomposite material (R, R) including at least one monofilament () made of glass-resin composite including glass filaments () embedded in a thermoset polyester resin (), characterized in that said monofilament is coated with at least one layer () of benzoxazine; use of such a material as reinforcer in finished articles or semi-finished products made of rubber; finished articles or semi-finished products made of rubber, such as vehicle tyres, reinforced with such a material.

Glass-resin composite-based multi-composite material

A metallic or metallized reinforcer has at least a surface of which is at least partially metallic, the at least partially metallic surface being coated with a polybenzoxazine sulfide whose repeating units include at least one unit corresponding to formula (I) or (II): in which the two oxazine rings are connected together via a central aromatic group, the benzene ring of which bears one, two, three or four groups of formula &#x2014;S&#x2014;R in which 'x' is an integer from 1 to 8 and R represents hydrogen or a hydrocarbon-based group including 1 to 10 carbon atoms and optionally a heteroatom chosen from O, S, N and P. Such a reinforcement can be used for the reinforcement of a rubber article, in particular a motor vehicle tire.

Metal or metal-plated reinforcement with sulfur polybenzoxazine-coated surface

A polybenzoxazine sulfide has repeating units including at least one unit corresponding to formula (I) or (II): in which the two oxazine rings are connected together via a central aromatic group, the benzene ring of which bears one, two, three or four groups of formula &#x2014;S&#x2014;R in which 'x' is an integer from 1 to 8 and R represents hydrogen or a hydrocarbon-based group including 1 to 10 carbon atoms and optionally a heteroatom chosen from O, S, N and P. Such a polybenzoxazine can be used as an adhesive layer on metal, in particular for the adhesive bonding of a metallic substrate, in particular made of carbon steel, to rubber.

Sulfurized polybenzoxazine that can be used for coating metal and for the bonding of same to rubber

A metal or metallized reinforcer, at least the surface of which is at least partially metallic, comprises at least a metallic part coated with a polybenzoxazine, the repeat units of which comprise at least one unit corresponding to the formulae (I) or (II): in which Zand Z, which are identical or different, represent an at least divalent, aliphatic, cycloaliphatic or aromatic bonding group comprising at least one carbon atom and optionally at least one heteroatom selected from O, S, N and P. Such a reinforcement can be used for the reinforcement of a rubber article, in particular a motor vehicle tire.

Metal or metallized reinforcement with polybenzoxazine-coated surface

Polybenzoxazine comprises repeat units which comprise at least one unit corresponding to the formulae (I) or (II): in which Zand Z, which are identical or different, represent an at least divalent, aliphatic, cycloaliphatic or aromatic bonding group comprising at least one carbon atom and optionally at least one heteroatom selected from O, S, N and P. Such a polybenzoxazine may be used as a metal-adhesive layer, in particular for the adhesive bonding of a metal substrate, in particular made of carbon steel, to a rubber.

Polybenzoxazine that can be used for coating metal and for the bonding of same to rubber

At least a metallic part of a metal or metallized reinforcer, at least the surface of which is at least partially metallic, is coated with a polybenzoxazine, the repeat units of which comprise at least one unit corresponding to the formulae (I) or (II): in which Zrepresents an at least divalent, aliphatic, cycloaliphatic or aromatic bonding group comprising at least one carbon atom and optionally at least one heteroatom selected from O, S, N and P; Xand X, which are identical or different, represent O or S; Arand Ar, which are identical or different, represent a substituted or unsubstituted phenylene group; and Zrepresents O or (S), the symbol 'n' representing an integer equal to 1 or greater than 1. Such a reinforcement can be used for the reinforcement of a rubber article, in particular a motor vehicle tyre.

Metallic or metallized reinforcement, 1HE surface of which is coated with a polybenzoxazine

A sulfurized benzoxazine compound, which is usable for the synthesis of a polybenzoxazin, corresponds to formula (A): in which: each benzene nucleus of the two oxazine rings bears at least one radical denoted as 'G'; the two oxazine rings are connected together via a central aromatic group, the benzene ring of which bears one, two, three or four groups of formula &#x2014;S&#x2014;R in which 'x' is an integer from 1 to 8 and R represents hydrogen or a hydrocarbon-based group including 1 to 10 carbon atoms and optionally a heteroatom chosen from O, S, N and P; and the at least two radicals G, which may be identical or different, are chosen from various groups.

Sulfurized benzoxazine for use in the synthesis of a polybenzoxazine

A halogenated benzoxazine compound, which can be used in particular as monomer in the synthesis of polybenzoxazine, corresponds to the formula (the symbol Hal representing at least one halogen): in which: each benzene nucleus bears at least one halogen; Rand R, which are identical or different, represent hydrogen or an alkyl comprising from 1 to 8 carbon atoms; 'x' and 'x', which are identical or different, are integers equal to or greater than 1; &#x201c;x&#x201d; is an integer equal to or greater than 1; and X is a heteroatom chosen from O and S.

Halogenated benzoxazine for use in the synthesis of polybenzoxazine

A halogenated benzoxazine compound, which can be used in particular as monomer in the synthesis of polybenzoxazine, corresponds to the formula: in which: each benzene nucleus of the two oxazine rings bears at least one halogen (represented by the symbol Hal), in particular bromine, chlorine or fluorine; and Zand Z, which are identical or different, represent an aliphatic, at least divalent, bonding group comprising at least one carbon atom and optionally at least one heteroatom chosen from O, S, N and P.

A borated benzoxazine compound, which can be used in particular as monomer in the synthesis of polybenzoxazine, corresponds to the formula: in which: Z represents an at least divalent, aliphatic, cycloaliphatic or aromatic, bonding group comprising at least one carbon atom and optionally at least one heteroatom chosen from O, S and P; and R, R, Rand R, which are identical or different, represent hydrogen or an alkyl comprising from 1 to 12 carbon atoms, it being possible for Rand R, on the one hand, and Rand R, on the other hand, optionally to form a heterocycle with the two oxygen atoms and the boron atom to which they are respectively bonded.

Borated benzoxazine for use in the synthesis of polybenzoxazine

A threadlike metallic or metallized reinforcer, for example a thread, film, tape or cord made of carbon steel, at the periphery of which is positioned a layer of metal referred to as 'surface metal' chosen from copper, nickel and copper/nickel alloys, is characterized in that this surface metal layer is itself coated, at least in part, with at least one layer of graphene; preferably, there is grafted, to this graphene, at least one functional group which can crosslink to a polymer matrix. This reinforcer of the invention is effectively protected from corrosion by virtue of the graphene present at the surface; advantageously, it can be adhesively bonded directly, without adhesion primer or addition of metal salt, to an unsaturated rubber matrix, such as natural rubber, by virtue of the possible functionalization of this graphene.

Metallic or metallized, graphenized reinforcement

A solid composition, of use in particular on any type of metallic substrate as a hydrophobic, electrically conductive, metal-adhesive coating, comprises at least (% by weight of composition): as conductive filler, from 75% to 95% of electrically conductive microparticles, the weight-average size of which is between 1 &#x3bc;m and 100 &#x3bc;m; and as hydrophobic, metal-adhesive polymer matrix, from 5% to 25% of a polymer matrix denoted 'P', comprising at least 2 different polymers P1, a thermoplastic fluoropolymer, the weight-average molecular weight of which, denoted 'Mw', is between 100 000 and 1 000 000 g/mol; and P2, a thermoset resin, the glass transition temperature of which is between 30&#xb0; C. and 150&#xb0; C. A steel bipolar plate, especially made of stainless steel, for a fuel cell, may be coated with such a composition.

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Clermont-Ferrand, France

Milan Fedurco