Pipes and tubular conduits – Flexible – Spirally wound material
Patent
1997-11-20
1999-07-06
Ferensic, Denise L.
Pipes and tubular conduits
Flexible
Spirally wound material
138144, 138153, 138129, F16L 1108
Patent
active
059186429
ABSTRACT:
A flexible synthetic resin tube is provided by uniting an inner layer of a polyether-series thermoplastic polyurethane resin with a hard synthetic resin spiral reinforcement (e.g. a hard vinyl chloride resin) or a soft synthetic resin outer layer (e.g. a soft vinyl chloride resin), through an interposed adhesive intermediate resin layer. The polyurethane resin includes a resin having a diol composed of a tetramethylenoxy unit as a polyol component. The spiral reinforcement may be buried in the outer layer. The intermediate resin layer may comprise a mixture of the polyether-series thermoplastic polyurethane resin, and the synthetic resin for the spiral reinforcement or the outer layer. This tube imparts an enhanced hydrolysis-resistant property to the polyurethane resin forming the inner layer, and an improved adhesive strength between the inner layer and the spiral reinforcement or the outer layer.
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Japanese Utility Model Publication No. 7939/ (English translation of claim is enclosed), Feb./1974.
Akedo Youichi
Hattori Shoji
Inagake Tetsuya
Kodama Hitoya
Shiga Seiji
Ferensic Denise L.
Hook James F.
Tigers Polymer Corporation
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