Gel reduction in blends of thermoplastic polyurethane and...

C - Chemistry – Metallurgy – 08 – L

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C08L 75/04 (2006.01) B32B 27/40 (2006.01) C08J 5/18 (2006.01) C08K 5/00 (2006.01) C08L 29/04 (2006.01) C08L 67/00 (2006.01) C08L 71/00 (2006.01)

Patent

CA 2546490

Gas barrier layers and composites contain a low gel sheet (30) produced from a composition containing a thermoplastic polyurethane (TPU), a hydroxyl functional copolymer, and a gel reducing additive. The gel reducing additive has functional groups that can react with isocyanate groups to reduce gel formation during the processing of blends of urethane containing polymers and hydroxyl functional polymers. Multilayer composites (28) containing the low gel sheets can be made into inflatable membranes (28) for containing an inflationary gas. In a particularly preferred embodiment, the membranes are used as bladders of cushioning devices in the soles of shoes (10), particularly athletic shoes (10).

L'invention concerne des couches imperméables aux gaz et des composites contenant un feuille de gel faible produite à partir d'une composition contenant un polyuréthanne thermoplastique (TPU), un copolymère fonctionnel hydroxyle, et un additif réducteur de la teneur en gel, lequel additif possède des groupes fonctionnels pouvant réagir avec des groupes isocyanate pour réduire la formation de gel pendant le traitement des mélanges de polymères contenant de l'uréthanne et des polymères fonctionnels hydroxyle. Des composites multicouches contenant des feuilles de gel faible peuvent être transformés en membranes gonflables pour contenir un gaz de gonflage. Dans un mode de réalisation particulièrement préféré, les membranes sont utilisées comme sacs gonflables de dispositifs amortisseurs dans des semelles de chaussures, notamment de chaussures d'athlétisme.

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