Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1992-12-04
1993-08-10
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521129, 521130, 521172, B05D 302, C08J 900
Patent
active
052349659
ABSTRACT:
The present invention relates to a process for preparing flexible, semi-flexible or rigid polyurethane foam plastics from a polyfunctional isocyanate and a polyhydric compound. More specifically, the invention involves the substitution of some portion of the hydroxy groups on the polyhydric compound with acetoacetate groups. Such substitution reduces the viscosity of the polyhydric resin without effecting the performance properties of the foams. Various substitution levels can be used depending on the desired level of viscosity reduction.
REFERENCES:
patent: 4963399 (1990-10-01), Gill
patent: 5051529 (1991-09-01), Witzeman
patent: 5084486 (1992-01-01), Patten et al.
patent: 5171759 (1992-12-01), Hager
patent: 5177119 (1993-01-01), Motte
Carter Thomas E.
Gott Samuel L.
Petroskey Wade T.
Williams T. Hugh
Zima G. C.
Eastman Kodak Company
Foelak Morton
Heath, Jr. William P.
Thallemer John D.
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