Bicomponent moisture barrier poly(etherimide) ester films

Details Bicomponent moisture barrier poly(etherimide) ester films Bicomponent moisture barrier poly(etherimide) ester films

1987-12-28

1988-09-06

Herbert, Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428262, 4284735, 428480, 428913, B32B 702, B32B 2708, B32B 2736

Patent

active

047692731

ABSTRACT:
A bicomponent film of a hydrophilic copolyester having a WVTR of at least 3500 gm.mil/m.sup.2 /24 hrs. of a poly(etherimide) ester elastomer containing about 25-60 weight percent ethylene oxide units, and a hydrophobic copolyester having a WVTR of 400-2500 gm.mil/m.sup.2 /24 hrs. of a poly(etherimide) ester elastomer or a segmented copolyester elastomer having no more than about 20 weight percent ethylene oxide units in the hydrophobic elastomers, the bicomponent film having a separation ratio for water vapor of at least 1.2 as determined by ASTM/E 96-66 (Procedure BW).

REFERENCES:
patent: 4493870 (1985-01-01), Vrouenraets et al.
patent: 4556688 (1985-12-01), McCready et al.
patent: 4556705 (1985-12-01), McCready
patent: 4636442 (1987-01-01), Beavers et al.
patent: 4714754 (1987-12-01), McCready et al.
patent: 4725481 (1988-02-01), Ostapchenko

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