Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1987-02-24
1988-02-16
Buffalow, Edith
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428287, 428483, 528301, 528343, B32B 702
Patent
active
047254815
ABSTRACT:
(A) A continuous layer of a hydrophobic elastomer having a water vapor transmission rate of 400-2500 gm.mil/m.sup.2 /24 hrs., said hydrophobic elastomer is a copolyetherester having a multiplicity of recurring long-chain ester units and short-chain ester units, said long-chain ester units being represented by the formula ##STR1## and said short-chain ester units being represented by the formula ##STR2## where G is a divalent radical remaining after the removal of terminal hydroxyl groups from a poly(alkylene oxide)glycol having an average molecular weight of about 400-3500, the amount of ethylene oxide groups incorporated in the copolyetherester by the poly(alkylene oxide)glycol is not greater than about 20 weight percent; R is a divalent radical remaining after removal of carboxyl groups from a dicarboxylic acid having a molecular weight less than 300; D is a divalent radical remaining after removal of hydroxyl groups from a diol having a molecular weight less than about 250;
(B) a continuous layer of a hydrophilic elastomer having a water vapor transmission rate of at least 3500 gm.mil/m.sup.2 /24 hrs. said hydrophilic elastomer is a copolyetherester having a multiplicity of long-chain ester units and short-chain ester units represented by formulae (I) and (II) above and having the values given above with the proviso that the amount of ethylene oxide groups incorporated in the copolyetherester by the poly(alkylene oxide)glycol is from about 25-68 weight percent and
said bicomponent film has a separation ratio for water vapor of at least 1.2.
REFERENCES:
patent: 2865891 (1958-12-01), Michel
patent: 3023192 (1962-02-01), Shivers
patent: 3784520 (1974-01-01), Hoeschele
patent: 4367327 (1983-01-01), Holker et al.
patent: 4454191 (1984-06-01), Von Blucher et al.
patent: 4493870 (1985-01-01), Vrouenraets et al.
Industrial and Engineering Chem., vol. 49, No. 11 (Nov. 1957), pp. 1933-1936.
Buffalow Edith
E. I. Du Pont de Nemours and Company
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