Process for preparing a composite tubular article consisting of

Details Process for preparing a composite tubular article consisting of Process for preparing a composite tubular article consisting of

1995-06-02

1997-07-01

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Extrusion molding

1563077, 26417112, 26417127, 26417128, 264236, 264347, B29C 3510

Patent

active

056435266

ABSTRACT:
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.

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