Felted hydrophilic ester polyurethane foams

Details Felted hydrophilic ester polyurethane foams Felted hydrophilic ester polyurethane foams

2005-01-11

2005-01-11

Cooney, Jr., John M. (Department: 1711)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S110000, C521S112000, C521S130000, C525S123000, C525S127000, C525S453000

Reexamination Certificate

active

06841586

ABSTRACT:
An ester polyurethane foam is prepared by reacting a mixture of one or more polyester polyols with one or more isocyanates and one or more silicone surfactants in the presence of a blowing agent, such as water, and other additives, such as catalysts. The cured foam is chemically treated in a caustic solution and is then felted (compressed under heat and pressure) to form a hydrophilic ester polyurethane foam having a water absorption rate of at least 30 pounds of water per square foot per minute (1.44 kPa/min). The foam also has greater water holding capacity and wet strength than cellulose.

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