Patent EP0220711A2 successfully refreshed from Google Patents.
EP0220711A2
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Polyetherester elastomer composition
Assignee: DuPont Canada Inc
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Filing: 1986-10-28
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Granted: —
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Expires: 2006-10-28
Abstract
Abstract A specific elastomeric composition is formed by melt blending two particular elastomers, each composed of hard and soft segments made from poly(tetramethylene 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 Edward Benim
- 👤 Michael Andrew Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 12:55
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: 10
Claim 1
Independent Claim
149 words
An improved elastomeric composition formed from a melt blend of polyetherester elastomers, each elastomer being formed of hard and soft segments made from a poly(tetramethylene ether) glycol, 1,4-butane diol and a phenylene dicarboxylic acid or a derivative thereof, characterized in that 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 first elastomer and soft segments of 1800 to 3000 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 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
149 words
An improved elastomeric composition formed from a melt blend of polyetherester elastomers, each elastomer being formed of hard and soft segments made from a poly(tetramethylene ether) glycol, 1,4-butane diol and a phenylene dicarboxylic acid or a derivative thereof, characterized in that 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 first elastomer and soft segments of 1800 to 3000 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 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
19 words
A composition of claim 1 or 2 wherein the phenylene dicarboxylic acid is terephthalic acid or a derivative thereof.
Claim 6
Dependent Claim
24 words
A composition of claim 4 wherein isophthalic acid or a derivative thereof replaces as much as 30% of the terephthalic acid or its derivative.
Claim 7
Dependent Claim
90 words
A process for preparing an elastic film from the composition of claim 2, the process comprising in sequence, compounding the anti-blocking agent in the second elastomer, melt blending the resultant compounded elastomer with the first elastomer, melt extruding the melt-blended elastomers at a temperature in the range of 180 to 220°C through a slot orifice to form a thin film, quenching the thin film to a temperature below 50°C, advancing the quenched film at a speed that provides the film with a draw-down in the range of 12 to 40.
Claim 8
Dependent Claim
44 words
The process of claim 6 wherein the quenching is provided by immersion in a water bath and an air gap, exists between the slot orifice exit and the water bath entrance, the gap having a length in the range of 3 to 25 mm.
Claim 9
Dependent Claim
41 words
A process of claim 7 wherein the melt-extrusion temperature is in the range of 190 to 200°C, the air gap is in the range of 10 to 15 mm long and the draw-down is in the range of 15 to 25.
Claim 10
Dependent Claim
50 words
A film strip of 0.02 to 0.05-mm thickness prepared by the process of claim 6 and having a tenacity at break of at least 0.4 g/dtex, a break elongation in the range of 400 to 700%, a power of at least 0.035 g/dtex, and a set of less than 15%.
References Cited (Backward Citations)
No citation records indexed.
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