Moisture-permeable sheets

Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond

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Details

428253, 4283155, 4284231, 4284237, B32B 700

Patent

active

045073562

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.

REFERENCES:
patent: 4425395 (1984-01-01), Negishi et al.
patent: 4436570 (1984-03-01), Neuhaus et al.

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