Reduction of discoloration in white polyurethane foams

Details Reduction of discoloration in white polyurethane foams Reduction of discoloration in white polyurethane foams

2007-07-24

2007-07-24

Cooney, Jr., John M. (Department: 1711)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C252S182240, C252S182290, C252S397000, C252S399000, C252S401000, C252S404000, C252S405000, C252S407000, C521S099000, C521S128000, C521S130000

Reexamination Certificate

active

10615283

ABSTRACT:
Surprisingly effective additive formulations for the reduction of highly undesirable yellowing or other discoloration of white, uncolored, polyurethane foam articles are provided. White polyurethane foam exhibits a susceptibility to yellowing and discoloration to a great extent, particularly in relatively short periods of time, than other types of polymeric articles. The inventive additives impart excellent low-discoloration properties over appreciable amounts of time of regular exposure to harmful elements, thereby according the pertinent industry a manner of providing white polyurethane foams for longer periods of time. Methods of producing such reliably white-colored polyurethane foams are also provided.

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