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 1877, C08G 1832
Patent
active
043840507
ABSTRACT:
A flexible, hydrophobic 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 having a molecular weight of at least about 1100, 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 monomeric polyol crosslinking agent having 3 or 4 hydroxyl equivalents per mole. The preferred polyol is trimethylolpropane and the diol is an equimolar mixture of Carbowax 1000 and Carbowax 1450. The diol and the polyol, such as trimethylolpropane, are present in a mole ratio in the range of 4:1 to 8:1 while the ratio of the isocyanate equivalents to the total hydroxyl equivalents is in the range of 2.5:1 to 3.5:1. 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.
REFERENCES:
patent: 3890254 (1975-06-01), Guthrie
patent: 3939123 (1976-02-01), Matthews et al.
patent: 4008189 (1977-02-01), van Leuwen et al.
patent: 4049592 (1977-09-01), Marans et al.
patent: 4160076 (1979-07-01), Guthrie et al.
patent: 4237240 (1980-12-01), Jarre et al.
patent: 4256849 (1981-03-01), Ick et al.
patent: 4292412 (1981-09-01), Wood
patent: 4309509 (1982-01-01), Wood
patent: 4314034 (1982-02-01), Fulmer et al.
patent: 4317200 (1979-01-01), Wood et al.
Tech. Service Report, The Upjohn Co., LaPorte, Texas, "Isonate 143L Liquid MDI".
Technical Information, The Upjohn Co., LaPorte, Texas, "PAPI 94".
Cabic Edward J.
Cockeram H. S.
W. R. Grace & Co.
LandOfFree
Flexible polyurethane foam based on MDI does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flexible polyurethane foam based on MDI, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flexible polyurethane foam based on MDI will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1567006