Copolyether amide and water vapor permeable film made therefrom

Details Copolyether amide and water vapor permeable film made therefrom Copolyether amide and water vapor permeable film made therefrom

1997-11-24

1999-11-23

Kiliman, Leszek

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283171, 4284744, 526 71, 525408, 525430, 525423, 525437, 524104, 524505, 524608, 528288, 528 70, 528310, 528323, 528287, 528282, 528328, 528326, 528272, B32B 326, B32B 2708

Patent

active

059896973

ABSTRACT:
Claimed is a copolyether amide having a melting point in the range of 180.degree. to 260.degree. C., incorporating at least 10 wt. % and not more than 30 wt. % of ethylene oxide groups, and composed of 30 to 60 wt. % of polyamide segments and 70 to 40 wt. % of segments derived from a (cyclo)aliphatic or aromatic dicarboxylic acid or a dimeric fatty acid and a polyoxyalkylene diamine derived from a polyoxyalkylene group having a molecular weight of 600 to 6000 and an atomic ratio of carbon to oxygen of 2.0 to 4.3. Also claimed is a non-porous, waterproof film having a water vapor permeability of at least 1000 g/m.sup.2 day determined at 30.degree. C. and 50% RH in accordance with ASTM E96-66 which is based on a the use of these films in rainwear, shoes, tents, chairs, as mattress covers and underslating, for medical purpose garments, and for the manufacture of dressings.

REFERENCES:
patent: 2071250 (1937-02-01), Carothers
patent: 2071253 (1937-02-01), Carothers
patent: 2130948 (1938-09-01), Carothers
patent: 3968183 (1976-07-01), Hayashi et al.
patent: 4808675 (1989-02-01), Twilley et al.
patent: 5506024 (1996-04-01), Flesher
patent: 5744570 (1998-04-01), Gebben
"Film Materials", Kirk-Othmer Encyclopedia of Chemical Technology, vol. 9, pp. 232-241 (1966).

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