Gamma 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
Life of this patent
Estimating the term…
Abstract
The gamma 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 or recrystallizing said compound from an alkanol of 4 to 8 carbon atoms. The gamma crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.
Claims6
A process for the preparation of the gamma crystalline form of the compound 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 178.degree.-185.degree. C. and by an X-ray diffraction pattern obtained using Cu-K.alpha. which exhibits diffraction angles (2.THETA.):
- ______________________________________ Peak No. Diffraction Angle ______________________________________ 1 5.4 2 6.3 3 8.8 4 9.9 5 10.3 6 10.8 7 11.7 8 13.8 9 14.8 10 15.5 11 16.1 12 17.0 13 17.7 14 18.4 15 20.2 ______________________________________
- which comprises, crystallizing or recrystallizing said compound from an alkanol of 4 to 8 carbon atoms.
The gamma 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 178.degree.-185.degree. C. and by an X-ray diffraction pattern obtained using Cu-K.alpha. which exhibits diffraction angles (2.THETA.):
- ______________________________________ Peak No. Diffraction Angle ______________________________________ 1 5.4 2 6.3 3 8.8 4 9.9 5 10.3 6 10.8 7 11.7 8 13.8 9 14.8 10 15.5 11 16.1 12 17.0 13 17.7 14 18.4 15 20.2 ______________________________________
A composition stabilized against thermal, oxidative and actinic induced degradation which comprises
- (a) a polyolefin, and
- (b) an effective stabilizing mount of the gamma 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 178.degree.-185.degree. C. and by an X-ray diffraction pattern obtained using Cu-K.alpha. which exhibits diffraction angles (2.THETA.):
- ______________________________________ Peak No. Diffraction Angle ______________________________________ 1 5.4 2 6.3 3 8.8 4 9.9 5 10.3 6 10.8 7 11.7 8 13.8 9 14.8 10 15.5 11 16.1 12 17.0 13 17.7 14 18.4 15 20.2 ______________________________________
Dependencies are inferred from the claim text.