Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1981-10-26
1983-05-17
Cockeram, H. S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521160, 521174, 521901, 521905, 521914, C08G 1814, C08G 1832, C08G 1877
Patent
active
043840515
ABSTRACT:
A flexible hydrophilic MDI based polyurethane foam is produced by mixing together an aqueous phase which can optionally contain reinforcing fibers and surfactants and a resin phase comprising a prepolymer derived from a poly (oxy C.sub.2-4 alkylene) diol, an MDI containing isocyanate product having a functionality greater than 2.0 made of a mixture of MDI and isocyanate containing derivatives of MDI, and a polymeric poly (oxy C.sub.2-4 alkylene) polyol cross-linking agent having 3 or 4 hydroxyl equivalents per mole and a molecular weight of at least 500. The preferred polyol is Poly G176-120. The polymeric polyol cross-linking agent is present so the hydroxy equivalents constitute 5 to 35 mole % of the total hydroxy equivalents in the diol and the polymeric polyol while the ratio of the isocyanate equivalents to the total hydroxyl equivalents is in the range of 2.5 to 3.5. The isocyanate containing product comprises less than 50% by weight of the prepolymer and Isonate 143L is the preferred isocyanate product. Flexible foams are obtained which are water-absorbing for medical or personal care applications.
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Cabic Edward J.
Cockeram H. S.
W. R. Grace & Co.
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