Moisture-permeable sheets
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United States of America Patent
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-
Mar 26, 1985
Grant Date -
N/A
app pub date -
Sep 30, 1982
filing date -
May 20, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-layer sheet used particularly as a wig base includes a lowermost layer of a poly-.alpha.-amino acid derivative, an uppermost layer of a polyurethane elastomer and woven or knitted fabric of nylon or polyester as reinforcing material, said layer of polyurethane elastomer alone or both said layer of polyurethane elastomer and said layer of poly-.alpha.-amino acid possessing moisture permeability. To prepare the sheet, finely-divided, water-soluble salt particles are dispersed in the polyurethane elastomer alone or both in the polyurethane elastomer and the amino acid derivative in the presence of a titanate coupling agent serving as a dispersant.
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