| 摘要 |
The present invention relates to a wound covering comprising a sheet of a biopolymeric material and a film of a polyurethane resin obtainable by reacting a diisocyanate and a random copolymer of tetrahydrofuran and ethylene oxide to produce a urethane prepolymer, and extending the molecular chain of the 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 has excellent adhesion flexibility, durability, easy handling, preservation, sterile filtration, compatibility with cell, blood starching and water-vapor permeability, making it quite suitable for practical use. |
