Moisture vapor permeable materials

• US 4,686,137 A
• Filed: 05/21/1984
• Issued: 08/11/1987
• Est. Priority Date: 02/29/1980
• Status: Expired due to Term

• Current Assignee: TC1 LLC (Abbott Laboratories Incorporated)
• Original Assignee: Thoratec Laboratories Corp. (Thoratec LLC)
• Inventors: Riffle, Judy S., Ward, Robert S. Jr.
• Primary Examiner(s): BRIGGS SR, WILBERT
• Application Number:
  US06/612,365
• Time in Patent Office: 1,177 Days
• Field of Search: 525/403, 525/453, 525/410, 428/423.1, 428/290, 528/28, 528/76
• US Class Current: 442/76
• CPC Class Codes: A61L 33/062 Mixtures of macromolecular compounds
• CPC Class Codes: A61L 33/068 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds A61L33/062 takes precedence
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/32 Polyhydroxy compounds; Polyamines; Hydroxyamines
• CPC Class Codes: C08G 18/4804 Two or more polyethers of different physical or chemical nature
• CPC Class Codes: C08G 18/4808 Mixtures of two or more polyetherdiols
• CPC Class Codes: C08G 18/61 Polysiloxanes
• CPC Class Codes: C08G 77/455 containing polyamide, polyesteramide or polyimide sequences
• CPC Class Codes: C08G 77/458 containing polyurethane sequences
• CPC Class Codes: C08G 77/46 containing polyether sequences
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/12 containing polyether sequences
• CPC Class Codes: D06N 2209/141 Hydrophilic
• CPC Class Codes: D06N 2209/142 Hydrophobic
• CPC Class Codes: D06N 2211/18 Medical, e.g. bandage, prostheses, catheter medical patches D06N2211/22; medical packaging D06N2211/20
• CPC Class Codes: D06N 3/047 with fluoropolymers
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 442/2139 Coating or impregnation specified as porous or permeable to a specific substance [e.g., water vapor, air, etc.]

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.

Claims

1. A coated textile impermeable to liquid water characterized by high moixture vapor transmission comprising a fabric web and a uniform nonporous coating on at least one surface of said web, said coating comprising a segmented block multipolymer comprising an essentially linear segmented copolymer chain characterized by at least one polyurethane or polyurethane urea hard segment and a soft block copolymer comprising at least one hydrophilic soft block and at least one hydrophobic soft block.

2. A textile according to claim 1 wherein said hard segment is a homopolymer selected from the group consisting of condensation products of diphenylmethane diisocyanate with a diamine and diphenylmethane diisocyanate with a diol.

3. A textile according to claim 2 wherein said hydrophilic soft block comprises polyethylene oxide and said hydrophobic soft block comprises polytetraalkylene oxide.

4. A textile according to claim 3 wherein said soft block copolymer further comprises a polydialkylsiloxane hydrophobic soft block.

5. A textile according to claim 3 wherein said coating comprises:

space="preserve" listing-type="tabular">______________________________________ 15-50% by weight of said hard segment 20-45% polyethylene oxide (1000-3000 mol. wt (number average)) 25-65% polytetramethylene oxide 100% ______________________________________

6. A textile according to claim 5 wherein said coating further comprises up to 2% by weight polydimethylsiloxane.