Color stabilization of hydroquinone hydroxyethyl ether products

Details Color stabilization of hydroquinone hydroxyethyl ether products Color stabilization of hydroquinone hydroxyethyl ether products

2006-02-07

2006-02-07

Anthony, Joseph D. (Department: 1714)

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

C252S182270, C252S182290, C252S182310, C568S580000, C568S630000

Reexamination Certificate

active

06994804

ABSTRACT:
The present invention relates to the color stabilization of hydroquinone hydroxyethyl ethers by phosphite compounds containing the bis-cyclic structure of spiro phosphites, both rings being attached to the same tertiary carbon atom in the phosphite molecule.

REFERENCES:
patent: 3592858 (1971-07-01), Brimer
patent: 4119594 (1978-10-01), Iobst et al.
patent: 4383051 (1983-05-01), Meyborg et al.
patent: 4731410 (1988-03-01), Bueltjer et al.
patent: 5599874 (1997-02-01), Singer et al.
patent: 6417255 (2002-07-01), Penning et al.

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