Copolyether amide and water vapour permeable film made therefrom

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

1996-08-16

1998-04-28

Hampton-Hightower, P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528272, 528288, 528292, 528297, 528310, 528323, 528326, 528328, 4283155, 4283171, 4284744, 526 71, 524401, 524505, 524600, C08G 6342, C08G 6908, C08G 7300

Patent

active

057445702

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 vapour 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 understating, 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

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