Polyether polyols, polyester polyols and polyurethanes of...

Details Polyether polyols, polyester polyols and polyurethanes of... Polyether polyols, polyester polyols and polyurethanes of...

2011-02-01

2011-02-01

Sanders, Kriellion A (Department: 1796)

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

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S243000, C524S251000, C524S257000, C524S258000, C524S291000

Reexamination Certificate

active

07879928

ABSTRACT:
The present invention describes a process for preventing the formation of aldehydic contaminants in polyether polyols, polyester polyols or polyurethanes which comprises incorporating into said polyether polyols, polyester polyols or polyurethanes an effective amount of a) a phenolic antioxidant, b) one or more compounds selected from (i) aminic antioxidants, (ii) benzofuran-2-ones, and (iii) phosphites or phosphonites, or (iv) mixtures thereof.

REFERENCES:
patent: 3429837 (1969-02-01), Langrish et al.
patent: 3637865 (1972-01-01), Haring
patent: 4021385 (1977-05-01), Austin et al.
patent: 4094855 (1978-06-01), Spivack
patent: 2003/0212170 (2003-11-01), Tinkl et al.
patent: 0399142 (1990-11-01), None
Hans Zwiefel, Plastics Additives Handbook, 5thEdition, Hanser Publishers, Munich 2001, pp. 88-109.

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