Process an alpha monoclinic crystalline modification of 2,2',2"-

Details Process an alpha monoclinic crystalline modification of 2,2',2"- Process an alpha monoclinic crystalline modification of 2,2',2"-

1992-11-30

1994-08-02

Lee, Mary C.

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

Organic compounds

Phosphorus esters

524119, C07F 96574

Patent

active

053347390

ABSTRACT:
The alpha crystalline modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl) O"phosphite] is obtained by crystallizing said compound from selected solvents, preferably from a mixture of an aromatic hydrocarbon solvent and a lower alkanol.
The alpha crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

REFERENCES:
patent: 4318845 (1982-03-01), Spivack et al.
patent: 4374219 (1983-02-01), Spivack et al.
L. C. Cross, et al. Pure Appl. Chem 45, 11-30 (1976).
G. Gold, et al., J. Pharm. Sci., 55, 1291 (1966).

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