초록 ▼

Disclosed is a water blown, open cell, hydrophilic polyurethane foam, a process for preparing such a foam and articles made therefrom. Utilizing a one step process the foam is formed from a reaction mixture comprising an organic polyisocyanate, water, a reaction catalyst and a mixture of certain pol

Disclosed is a water blown, open cell, hydrophilic polyurethane foam, a process for preparing such a foam and articles made therefrom. Utilizing a one step process the foam is formed from a reaction mixture comprising an organic polyisocyanate, water, a reaction catalyst and a mixture of certain polyols. The first polyol utilized in the invention is a poly(oxyalkylene) triol, chain terminated with propylene oxide and having a molecular weight in the range of about 2800 to about 6200. The second polyol is a poly(oxyalkylene) polyol, chain terminated with ethylene oxide or propylene oxide and having a molecular weight in the range of about 60 to about 800. The third polyol comprises at least one selected from the group of (i) poly(oxyalkylene) diols chain terminated with ethylene oxide and having a molecular weight in the range of about 500 to about 4000 and (ii) polyfunctional polyols chain terminated with propylene oxide and having a molecular weight in the range of about 250 to about 1000.

대표청구항 ▼

A water blown, open cell, hydrophilic polyurethane foam having a density between about 0.7 to about 2.0 lb/ft3, said foam being the reaction product of: (a) an organic polyisocyanate; (b) water; (c) a reaction catalyst; (d) a poly(oxyalkylene) triol, chain terminated with propylene oxide and having

A water blown, open cell, hydrophilic polyurethane foam having a density between about 0.7 to about 2.0 lb/ft3, said foam being the reaction product of: (a) an organic polyisocyanate; (b) water; (c) a reaction catalyst; (d) a poly(oxyalkylene) triol, chain terminated with propylene oxide and having a molecular weight in the range of about 2800 to about 6200; (e) a diol selected from the group consisting of diethylene glycol, ethylene glycol, polyethylene glycol, tetraethylene glycol, 1,4-butanediol, propylene glycol, and triethylene glycol, said diol having a molecular weight in the range of about 60 to about 250; and (f) a polyol selected from the group consisting of (i) poly(oxyalkylene) diols, chain terminated with ethylene oxide and having a molecular weight in the range of about 500 to about 4000, and (ii) polyfunctional polyols, chain terminated with propylene oxide and having a molecular weight in the range of about 250 to about 1000; wherein the ratio of NCO to OH groups for the polyisocyanate, diols and polyols is at least about 0.5:1, and wherein about 10 to about 40 wt. %, of the total weight of the diols and the polyols is (d), about 5 to about 60 wt. % is (e), and about 4 to about 60 wt. % is (f).