Importance

Loading Importance Indicators...

Abstract

A polyurethane foam is obtained by reacting raw materials containing a polyisocyanate, a polyol, a water-absorbency-imparting agent, a catalyst, and a blowing agent, foaming the reaction mixture, and curing the foamed product. The polyol is a polyester polyol. The water-absorbency-imparting agent is a polyoxyalkylene compound having a molecular weight of 100 to 1000 and having a hydroxy group at an end of the molecular chain, or an alcohol with 1 to 8 carbon atoms. The amount of the water-absorbency-imparting agent is from 0.5 to 8 parts by mass per 100 parts by mass of the polyester polyol. The polyisocyanate is an aliphatic polyisocyanate, an alicyclic polyisocyanate, or an aromatic polyisocyanate in which the isocyanate groups are not directly attached to an aromatic ring. The foam has a water absorption ratio of 10 to 30 and a color difference ΔYI of 7 or less. The time required until water dropped onto a surface of the foam is completely absorbed into the foam is 20 seconds or less.

Loading the Abstract Image...

First Claim