Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Web – sheet or filament bases; compositions of bandages; or...
Patent
1989-11-22
1991-07-30
Cashion, Jr., Merrell C.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Web, sheet or filament bases; compositions of bandages; or...
424443, 424445, 424484, 424485, 424488, A61F 1302, A61K 970, A61L 1503, A61L 1506
Patent
active
050358936
ABSTRACT:
The present invention relates to a wound covering comprising a sheet of biopolymeric material and a film of a polyurethane resin obtained by reacting a diisocyanate and a random copolymer of tetrahydrofuran and ethylene oxide to produce a urethane prepolymer, and extending the molecular chain of said prepolymer by using a chain extender, said random copolymer containing 20 to 80% by weight of the ethylene oxide unit in the molecular chain thereof and having a number-average molecular weight of 800 to 3000.
The wound covering of the present invention is excellent in adhesion flexibility, durability, easy handling, preservation, sterile filtration, compatibility with cell, blood starching, water-vapor permeability. Therefore, it is quite suitable for practical use.
REFERENCES:
patent: 4590022 (1986-05-01), Cioca et al.
Kobayashi Tatsuhiko
Kounami Yasuo
Kuroyanagi Yoshimitsu
Shioya Nobuyuki
Azpuru Carlos
Cashion Jr. Merrell C.
Mitsubishi Kasei Corporation
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