Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1981-12-08
1982-12-21
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521905, 521914, 528 66, 528 67, C08G 1814
Patent
active
043650252
ABSTRACT:
Flexible polyurethane foams are made from isocyanate containing prepolymers where the isocyanate is a mixture of diphenylmethane diisocyanate (MDI) and polymeric forms of MDI. The isocyanate mixture has a functionality greater than 2.0. The prepolymer is an isocyanate capped polyol or mixture of polyols where the polyols are diols or triols having at least 50% by weight oxyethylene groups. The foams are made by reacting water with the prepolymer and fire retardant materials can be added to the reaction mixture to produce fire retardant foams. The foams have improved physical properties and flammability resistance.
REFERENCES:
patent: 2683730 (1954-07-01), Seeger et al.
patent: 4137200 (1979-01-01), Wood et al.
patent: 4165411 (1979-08-01), Marans et al.
patent: 4237240 (1980-12-01), Jarre et al.
patent: 4292412 (1981-09-01), Wood
Technical Service Report of the Upjohn Polymer Chemicals Company on "Cast Elastomers and RIM Processing: The MDI Bridge".
"Encyclopedia of Polymer Science and Technology", vol. 11, Polyurethans and Flexible Foams, p. 538.
Murch Robert M.
Wood Louis L.
Cabic Edward J.
McDowell, Jr. William W.
Plunkett Richard P.
W. R. Grace & Co.
Welsh Maurice J.
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