Process for preparing a porous sheet material

Details Process for preparing a porous sheet material Process for preparing a porous sheet material

1983-07-26

1985-04-09

Lusignan, Michael R.

Coating processes

With post-treatment of coating or coating material

Heating or drying

427245, 4273855, 4273899, 4284231, 428904, B05D 302

Patent

active

045101868

ABSTRACT:
A process for preparing a porous sheet material, which comprises impregnating and/or coating on a substrate a water-in-oil type polyurethane emulsion (d) comprising a hydrophobic polyurethane (a), a hydrophilic polyurethane (b), and organic solvent (c) and water, and drying it, characterized in that said hydrophobic polyurethane (a) is a hydrophobic polyurethane dispersion (e) obtained by reacting a hydrophobic polyol, an organic diisocyanate and a chain extender is an organic solvent (c) which has a limited compatibility with water and in which the polyurethane thereby formed is substantially insoluble; said hydrophilic polyurethane (b) is a polyurethane containing about 20 to about 40% by weight, based on the total polymer, of polyoxyethylene groups; and the weight ratio of (a):(b) is about 90-99: about 10-1.

REFERENCES:
patent: 3418198 (1968-12-01), Einstman
patent: 3546001 (1970-12-01), Giannone et al.
patent: 3582396 (1971-06-01), Konig et al.
patent: 4233359 (1980-11-01), Mimura et al.

Affiliated with

Also associated with

Rating

Process for preparing a porous sheet material does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for preparing a porous sheet material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing a porous sheet material will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1169676