THERMOPLASTIC POLYMERS FOAMED WITH A SEMICARBAZIDE
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United States of America Patent
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Dec 4, 2015
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Dec 8, 2014
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Abstract
A method of preparing a foamed thermoplastic polymer comprises contacting a chemical blowing agent (A) which is a semi-carbazide with a thermoplastic polymer or a precursor of a thermoplastic polymer. Blowing agent (A) is preferably p-toluenesulfonyl semi-carbazide and said polymer is preferably PVC. Formulations, including liquid formulations which include the blowing agent (A) and other ingredients, are also described.
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