PNEUMATIC OBJECT PROVIDED WITH A GASTIGHT LAYER MADE OF A THERMOPLASTIC ELASTOMER AND LAMELLAR FILLER
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United States of America Patent
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Jun 14, 2012
app pub date -
Jul 22, 2010
filing date -
Jul 23, 2009
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Abstract
An inflatable object is equipped with a layer for sealing in an inflation gas. The layer is formed of an elastomeric composition that includes a predominant elastomer by weight, a block thermoplastic elastomer, and a lamellar filler. The block thermoplastic elastomer includes a polyisobutylene block with a number-average molecular mass ranging from 25,000 to 350,000 g/mol and a glass transition temperature of less than or equal to −20° C., and, at at least one end of the polyisobutylene block, a thermoplastic block made from at least a polymerized monomer other than a stirene monomer, the polymerized monomer having a glass transition temperature greater than or equal to 100° C. The lamellar filler has an equivalent diameter (Dv (0.5)) of between 15 and 60 micrometers and an aspect ratio (F) of greater than 65.
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