Elf Atochem S.a.

Atochem

Serge Nawrot

Marius Hert

Christian Dousson

Albert Strassel

Serge Lorek

Jacques Boutillier

Jacques Nury

The invention relates to a composite tubular article consisting of a vulcanized elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups, which is used in combination with a thermoplastic elastomer containing polyamide blocks. The invention also relates to a process for the preparation of such articles, characterized in that a tube consisting of an outer layer of thermoplastic elastomer containing polyamide blocks and optionally an inner layer consisting of a thermoplastic with good liquid-barrier property is sheathed by extrusion at an appropriate temperature of an elastomeric composition comprising a synthetic or natural elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups, a crosslinking system and optionally various adjuvants and fillers, in that the composite tubular article obtained is vulcanized, preferably at a temperature of between -5.degree. C. and +30.degree. C. in relation to the Vicat point of the said thermoplastic elastomer containing polyamide blocks. This process produces composite tubular articles exhibiting excellent properties, particularly of flexibility and of peel strength of the outer layer. The invention also relates to petrol pipes consisting of such articles in which the inner face of the thermoplastic tube is coated with a polymer for protection against liquids and preferably against fuels.

Composite tubular article consisting of a . . . petrol pipe and process

The invention relates to a process for preparing a composite tubular article consisting of a vulcanized elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups, which is used in combination with a thermoplastic elastomer containing polyamide blocks. The composite tubular article is prepared such that it consists of an inner layer of thermoplastic elastomer containing polyamide blocks sheathed by extrusion at an appropriate temperature with an elastomeric composition comprising a synthetic or natural elastomer containing carboxylic acid or dicarboxylic acid anhydride functional groups, a crosslinking system and optionally various adjuvants and fillers. Optionally, an innermost layer consisting of a thermoplastic with good liquid-barrier properties is present. The composite tubular article obtained is vulcanized, preferably at a temperature of between -5.degree. C. and +30.degree. C. in relation to the Vicat point of the said thermoplastic elastomer containing polyamide blocks. This process produces composite tubular articles exhibiting excellent properties, particularly of flexibility and of peel strength of the outer layer. The invention also relates to a process for preparing petrol pipes consisting of such articles in which the inner face of the thermoplastic tube is coated with a polymer for protection against liquids and preferably against fuels.

Process for preparing a composite tubular article consisting of a

A polyamide-based tube for transporting a gasoline having resistance to permeability therethrough of the gasoline consisting essentially of an outer polyamide layer and an inner polyvinylidene fluoride layer bonded together by an adhesion binder.

Polyamide-based tube for a gasoline transport

The process of making cross-linked copolymers comprising ethylene and a hydroxyalkyl monomer comprising contacting the copolymer with an organometallic compound of a metal of Group IVA or IVB of the Periodic Table for a time and at a temperature sufficient to effect cross-linking.

Process for cross-linking of copolymers comprising ethylene and a

This invention is directed to an adhesive composition comprising:

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Serquigny, France

Serge Nawrot