Abrasion resistant hose
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United States of America Patent
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May 8, 2001
Grant Date -
N/A
app pub date -
Dec 21, 1999
filing date -
Dec 21, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The abrasion resistant hose of the present invention comprises an inner layer mainly formed with a thermoplastic polyurethane resin, an outer protective layer comprising a soft vinyl chloride resin united with the inner layer by thermal-fusion, and a spiral reinforcement comprising a hard synthetic resin buried in or attached to the outer protective layer. The inner layer is formed with a thermoplastic polyurethane resin containing substantially no migratory plasticizer or an internally-plasticized thermoplastic polyurethane resin (i.e., a thermoplastic polyurethane resin which is not externally-plasticized with a migratory plasticizer). The outer protective layer is formed with a soft vinyl chloride resin containing substantially no migratory plasticizer, united with the inner layer by fusion. An intermediate layer comprising a soft vinyl chloride resin containing no migratory plasticizer may be interposed between the inner layer and the outer protective layer. According to the present invention, there is provided a pressure-proof synthetic resin hose featuring excellent abrasion resistance, bending durability, and others, which does not suffer the contraction phenomenon caused by the bleed or migration of a conventional plasticizer.
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Family
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