Trivalent phosphorus compounds stabilized with amines

Details Trivalent phosphorus compounds stabilized with amines Trivalent phosphorus compounds stabilized with amines

1994-08-31

1996-07-09

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

C09K 1532

Patent

active

055346456

ABSTRACT:
The invention relates to a process for stabilizing a crystalline organic phosphite or phosphonite against hydrolysis, which comprises introducing a mixture comprising phosphite or phosphonite, a solvent or solvent mixture, and 0.1 to 100% by weight (relative to phosphite or phosphonite) of an amine and having a temperature of 50.degree.-100.degree. C. as a homogeneous melt into a liquid crystallization medium whose temperature during the addition is maintained 10.degree.-70.degree. C. below the temperature of the melt.
The phosphites or phosphonites stabilized according to the invention are distinguished by their excellent resistance to hydrolysis and have a long shelf life even at high atmospheric humidity. They can be advantageously used as stabilizers for organic material against the damaging effect of heat, oxygen, and/or light.

REFERENCES:
patent: 3553298 (1971-01-01), Hodan et al.
patent: 3787537 (1974-01-01), De Marcq
patent: 5342978 (1994-08-01), Enlow et al.

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