Moisture vapor permeable materials
AssigneeTh. Goldschmidt AG
InventorRobert S. Ward, Jr.
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Abstract
Polymeric materials are provided characterized by hard segments and copolymer soft blocks comprising hydrophobic and hydrophilic components. The polymeric materials may be mixed with a base polymer and/or inorganic salts. The polymeric materials and mixtures containing same are characterized by improved moisture vapor transmission rates. The polymeric materials may be formed into films for use as wound dressings, burn dressings, surgical drapes, semipermeable membranes, and coatings for textiles.
Claims5
A nonporous segmented block multipolymer film impermeable to liquid water and characterized by a high moisture vapor transmission rate comprising an essentially linear segmented copolymer chain characterized by
- a) at least one hard segment, and
- b) at least two soft segments,
- a1) said hard segment being selected from the group consisting of reaction products of organic diisocyanates with
- a11) a diamine, and
- a12) a diol,
- b1) said soft segments comprising
- b11) at least one hydrophilic soft segment, and
- b211) said hydrophilic soft segment,
- b111) said hydrophilic soft segment consisting of ethylene oxide and up to at most 20% by weight of propylene oxide,
- b211) said hydrophobic soft segment consisting of polytetramethylene oxide,
- whereby the hydrophilic and the hydrophobic soft segments are separated from each other by hard segments.
Dependencies are inferred from the claim text.