Alpha crystalline modification of 2,2',2"-nitrilo triethyl-tris-(3,3',5,5'-t'-biphenyl-2,2'-diyl) phosphite!
AssigneeCiba-Geigy Corporation
InventorsStephen D. Pastor, Sai P. Shum, Paul A. Odorisio
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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.
Claims11
The alpha, monoclinic crystalline form of 2,2',2"-nitrilo triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl)phosphite!, characterized by melting in the range of 145.degree.-165.degree. C. and by an X-ray diffraction pattern exhibiting lines of very high intensity at 5.2;
- lines of high intensity at 10.7, 16.6 and 17.4;
- lines of medium intensity at 5.8, 8.0, 8.9, 10.0, 10.1, 10.7, 15.7, 16.2 and 18.2;
- lines of weak intensity at 6.3, 6.5, 7.2, 11.6, 12.7, 13.6, 14.2, 14.9, 17.0, 18.7 and 19.6;
- and a relative configuration of the three dibenzo d,f! 1.3.2!dioxaphosphepin rings of R*, R*, R*.
A composition stabilized against thermal, oxidative and actinic induced degradation which comprises
- (a) an organic material subject to thermal, oxidative or actinic induced degradation, and
- (b) an effective stabilizing amount of the alpha, monoclinic crystalline form of 2,2',2"-nitrilo triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl)phosphite!, characterized by melting in the range of 145.degree.-165.degree. C. and by an X-ray diffraction pattern exhibiting lines of very high intensity at 5.2;
- lines of high intensity at 10.7, 16.6 and 17.4;
- lines of medium intensity at 5.8, 8.0, 8.9, 10.0, 10.1, 10.7, 15.7, 16.2 and 18.2;
- lines of weak intensity at 6.3, 6.5, 7.2, 11.6, 12.7, 13.6, 14.2, 14.9, 17.0, 18.7 and 19.6;
- and a relative configuration of the three dibenzo d,f! 1.3.2!dioxaphosphepin rings of R*, R*, R*.
Dependencies are inferred from the claim text.