Method for inhibiting the discoloration of...

Details Method for inhibiting the discoloration of... Method for inhibiting the discoloration of...

2004-12-20

2009-12-15

Anthony, Joseph D (Department: 1796)

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

C252S400240, C252S401000, C252S389240, C252S390000

Reexamination Certificate

active

07632424

ABSTRACT:
A method for inhibiting the discoloration of methylenebisaniline compounds by adding a phosphine of the formula:in-line-formulae description="In-line Formulae" end="lead"?(H)p—P—(R3)qin-line-formulae description="In-line Formulae" end="tail"?(wherein R3is an optionally substituted aryl group or an optionally substituted alkyl group; p is 0, 1 or 2 and q is 1, 2 or 3) to a compound of the formula:(wherein R1and R2are each independently a halogen atom or a C1-C6 alkyl group; a and b are each independently an integer of 0 to 4; m and n are each independently an integer of 1 to 5).

REFERENCES:
patent: 6960640 (2005-11-01), Yoshimura et al.
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patent: 7169845 (2007-01-01), Tamura et al.
patent: 2005/0124711 (2005-06-01), Cameron et al.
patent: 2007/0108416 (2007-05-01), Nagasawa et al.
patent: 48-61435 (1973-08-01), None
patent: 48061435 (1973-08-01), None
patent: 55-31135 (1980-08-01), None
patent: 02-209851 (1990-08-01), None

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