SOLVENT-FREE PROCESS FOR THE PREPARATION OF THE BETA CRYSTALLINE MODIFICATION OF 2,2'2'-NITRILOTRIETHYL-TRIS-(3,3',5,5'-TETRA-TERT-BUTYL-1, 1'-BIPHENYL-2,2'-DIYL)PHOSPHITE

摘要

The beta crystalline form of 2,2' ,2"-nitrilo¢triethyl-tris-(3,3',5,5'-tetra-ter t-butyl-1,1'-biphenyl-2,2'-diyl) phosphite! is obtained by the thermal treatment of the phosphite compound at 125.degree.C in the absence of any solvent. The beta crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.