Alpha crystalline modification of 2,2',2"-nitrilo triethyl-tris-

Details Alpha crystalline modification of 2,2',2"-nitrilo triethyl-tris- Alpha crystalline modification of 2,2',2"-nitrilo triethyl-tris-

1993-11-12

1996-04-30

Ramsuer, Robert W.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

252 499, 25240021, 524111, 554 4, 558 78, C07F 9145, C08K 5527

Patent

active

055126219

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)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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