Membranes of polyurethane based materials including polyester polyols
AssigneeNIKE, Inc.
InventorsHenry W. Bonk, David Goldwasser
Life of this patent
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Abstract
The present invention relates to membranes including an urethane including a polyester polyol, wherein the membrane has a gas transmission rate of 15.0 or less for nitrogen gas wherein the membrane has an average thickness of approximately 20.0 mils. Under certain embodiments, the membranes include blends of one or more polyester polyol based thermoplastic urethanes and one or more barrier materials. The membranes can be employed in a variety of applications and can be used as either monolayers or multi-layered laminates.
Claims61
A flexible membrane comprising:
- a polyurethane including a polyester polyol, said membrane having a gas transmission rate of 15.0 or less for nitrogen gas;
- wherein said membrane is sealed and in an inflated state.
A flexible membrane comprising:
- a polyurethane including a polyester polyol, said membrane having a durability of at least 200,000 cycles under a KIM test analysis;
- wherein said membrane is sealed and in an inflated state.
A flexible membrane comprising:
- a polyurethane including a polyester polyol, said membrane having a yellowness index of 4.0 or less;
- wherein said membrane is sealed and in an inflated state.
A flexible membrane comprising:
- a polyurethane including a polyester polyol, said membrane having a total transmission of light at a level of at least 90.0%;
- wherein said membrane is sealed and in an inflated state.
Dependencies are inferred from the claim text.