Polyetherester elastomer composition
AssigneeE. I. Du Pont de Nemours and Company
InventorsThomas E. Benim, Michael A. Hamilton
Life of this patent
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Abstract
A specific elastomeric composition is formed by melt blending two particular elastomers, each composed of hard and soft segments made from poly(tetra-methylene ether) glycol, 1,4-butane diol and a phenylene dicarboxylic acid or a derivative thereof. The blend exhibits a melting endotherm that extends from no lower than 120.degree. C. to no higher than 215.degree. C. with a melting peak in the range of 150.degree. to 175.degree. C. Films made from the composition are particularly suited for use as elastic leg-strips in diapers.
Claims4
An improved elastomeric composition formed from a melt blend of polyetherester elastomers, each elastomer being formed of hard and soft segments made from reactants consisting essentially of a poly(tetramethylene ether)glycol, 1,4-butane diol and a phenylene dicarboxylic acid or a derivative thereof, the improvement wherein
- the phenylene dicarboxylic acid consists essentially of at least 70% terephthalic acid and no more than 30% isophthalic acid
- a first elastomer amounts to 75 to 85% by weight of the blend and has hard segments amounting to 20 to 25% by weight of said elastomer and soft segments of 1800 to 3000 number average molecular weight,
- a second elastomer amounts to 15 to 25% by weight of the blend and has hard segments amounting to 40 to 55% by weight of said second elastomer and soft segments of 850 to 2000 number average molecular weight, and
- the blend exhibits a melting endotherm over a temperature range that extends from no lower than 120.degree. C. to no higher than 215.degree. C. with a melting peak in the range of 150.degree. to 175.degree. C.
Dependencies are inferred from the claim text.