US4731407A
Expired / Lapsed
US
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Polyetherester elastomer composition
Assignee: DuPont Canada Inc
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Filing: 1985-10-28
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Granted: 1988-03-15
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Expires: 2005-10-28
Abstract
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° C. to no higher than 215° C. with a melting peak in the range of 150° to 175° C. Films made from the composition are particularly suited for use as elastic leg-strips in diapers.
Inventors
- 👤 Thomas E. Benim
- 👤 Michael A. Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:58
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/919; C08G; C08G63/00; C08G63/66; C08K; C08K3/00; C08K3/34; C08L; C08L67/00; C08L67/02; C08L67/025; B29K; B29K2021/00; B29K2105/00; B29K2105/06; B29K2105/16; B29L; B29L2031/00; B29L2031/48; B29L2031/4871; B29L2031/4878; C08J2367/00; C08J2367/02; C08L2666/00; C08L2666/02; C08L2666/14; C08L2666/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
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° C. to no higher than 215° C. with a melting peak in the range of 150° to 175° C.
Claim 2
Dependent Claim
177 words
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° C. to no higher than 215° C. with a melting peak in the range of 150° to 175° C.
Claim 3
Dependent Claim
33 words
A composition of claim 1 in which finely divided particles of an inorganic anti-blocking agent are incorporated in an amount in the range of 3 to 8% by weight of the elastomer blend.
Claim 4
Dependent Claim
11 words
A composition of claim 2 wherein the anti-block agent is talc.
Claim 5
Dependent Claim
16 words
A composition of claim 1, 2 or 3 wherein the phenylene dicarboxylic acid is terephthalic acid.
References Cited (Backward Citations)
US3651014A
Cited
US3766146A
Cited
US3763109A
Cited
US3932326A
Cited
US3968183A
Cited
US3917743A
Cited
JPS5958051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |