Low NMP aqueous polyurethane composition

Details Low NMP aqueous polyurethane composition Low NMP aqueous polyurethane composition

2011-07-12

2011-07-12

Tran, Thao T. (Department: 1787)

Stock material or miscellaneous articles

Composite

Of polyamidoester

C428S425600, C428S425900, C524S591000, C524S502000, C427S445000

Reexamination Certificate

active

07976953

ABSTRACT:
An aqueous composition with a sediment content ≦5%, comprising a polyurethane dispersion wherein the polyurethane has an acid value in the range of from 25 to 65 mgKOH/g and comprises (i) 36 to 60 wt % of at least one aromatic polyisocyanate and where the polyurethane is prepared in the presence of (a) ≦5 wt % of 1-methyl-2-pyrrolidinone by weight of the polyurethane, (b) 5 to 100 wt % of 1-ethyl-2-pyrrolidinone by weight of polyurethane and (c) water.

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International Search Report.

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