Method of molding rigid polyurethane foams with enhanced...

Details Method of molding rigid polyurethane foams with enhanced... Method of molding rigid polyurethane foams with enhanced...

2011-05-17

2011-05-17

Cooney, John (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S130000, C521S164000, C521S167000, C521S170000, C521S174000

Reexamination Certificate

active

07943679

ABSTRACT:
The present invention is to a molded rigid polyurethane foam for application in appliance, having a reduced thermal conductivity at densities between 33 and 38 kg/m3and a process for the production of such foams. The molded rigid polyurethane foam have a ratio of applied foam density (kg/m3) to lambda (mW/mK), measured at 10° C., 24 hours after foam production from 1.65 and to 2.15 and are obtained by the process of injecting into a closed mold cavity under reduced pressure a reaction mixture at a packing factor of 1.1 to 1.9 and the reaction mixture comprises: A) an organic polyisocyanate; B) a physical blowing agent, C) a polyol composition containing at least one polyol with a functionality of 3 or greater and a hydroxyl number between 200 and 800 and a water content of 0 to 2.5 weight percent of the total polyol composition; D) catalyst and E) auxiliary substances and/or additives.

REFERENCES:
patent: 5530033 (1996-06-01), Lunardon et al.
patent: 5736588 (1998-04-01), Eisen et al.
patent: 6831110 (2004-12-01), Ingold et al.

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