Breathable polyurethanes, blends, and articles

Details Breathable polyurethanes, blends, and articles Breathable polyurethanes, blends, and articles

2005-05-24

2005-05-24

Niland, Patrick D. (Department: 1714)

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C424S078020, C428S423100, C442S119000, C524S507000, C524S589000, C524S590000, C524S591000, C524S839000, C524S840000, C525S123000, C525S455000, C528S065000, C528S066000, C528S068000, C528S071000, C528S085000

Reexamination Certificate

active

06897281

ABSTRACT:
A breathable polyurethane having an upright moisture vapor transmission rate (MVTR) of more than about 500 gms/m2/24 hr comprises:(a) poly(alkylene oxide) side-chain units in an amount comprising about 12 wt. % to about 80 wt. % of said polyurethane, wherein (i) alkylene oxide groups in said poly(alkylene oxide) side-chain units have from 2 to 10 carbon atoms and are unsubstituted, substituted, or both unsubstituted and substituted, (ii) at least about 50 wt. % of said alkylene oxide groups are ethylene oxide, and (iii) said amount of said side-chain units is (i) at least about 30 wt. % when the molecular weight of said side-chain units is less than about 600 grams/mole, (ii) at least about 15 wt. % when the molecular weight of said side-chain units is from about 600 to about 1,000 grams/mole, and at least about 12 wt. % when the molecular weight of said side-chain units is more than about 1,000 grams/mole, and(b) poly(ethylene oxide) main-chain units in an amount comprising less than about 25 wt. % of said polyurethane.Coatings and films for textiles and other articles and applications using such polyurethanes have excellent breathability, i.e., high moisture vapor transmission rates (MVTR).

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