# US 5,326,802 A · Beta crystalline modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-buytl-1,1'-biphenyl- 2,2'-diyl)phosphite]

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- Number: US 5,326,802 A
- Document ID: US5326802A
- Status: Granted
- Kind: A
- Application number: 07/983,181
- Filed: 1992-11-30
- Granted: 1994-07-05
- Earliest claimed: 1992-11-30
- Assignees: Ciba-Geigy Corporation
- Inventors: Stephen D. Pastor; Sai P. Shum
- Web page: https://patentgrep.com/patent/US5326802A

## CPC

- C08K 5/527: Cyclic esters
- C07F 9/65746: {the molecule containing more than one cyclic phosphorus atom}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

The beta crystalline modification of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tertbutyl-1,1'-biphenyl-2,2 '-diyl) phosphite] is obtained by crystallizing said compound from the melt at elevated temperatures. The beta crystalline form is an effective process stabilizer for polyolefins, particularly polypropylene.

## Claims

### Claim 1

A process for the preparation of the beta, triclinic 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 200.degree.-207.degree. C. and by an X-ray diffraction pattern exhibiting lines of very high intensity at 8.4 and 17; lines of high intensity at 9.9, 10.6, 11.4, 17.5, 19.1, 20.2; lines of medium intensity at 4.6, 4.9, 7.1, 12.7, 13.2, 13.6, 15.3, 15.8, 16.4, 16.7, 18.4, 19.7, 21.7, 23.4; and lines of weak intensity at 7.8, 8.8, 9.4, 12, 14.1, 14.6, 21, 22.3, 22.8, 23.9, 24.7, 25.3, 25.5, 26.4, 27.27.7, 28.4 and a relative absolute configuration of the three stereo axes of the dibenzo[d,f][1,3,2]dioxaphosphepin rings of R*,R*,S*, which comprises
heating a melt of the compound 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl)phosphite] at a temperature in the range of 170.degree. to 200.degree. C. to crystallize the novel beta crystalline modification.

### Claim 2

A process for the preparation of the beta, triclinic 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 200.degree.-207.degree. C. and by an X-ray diffraction pattern exhibiting lines of very high intensity at 8.4 and 17; lines of high intensity at 9.9, 10.6, 11.4, 17.5, 19.1, 20.2; lines of medium intensity at 4.6, 4.9, 7.1, 12.7, 13.2, 13.6, 15.3, 15.8, 16.4, 16.7, 18.4, 19.7, 21.7, 23.4; and lines of weak intensity at 7.8, 8.8, 9.4, 12, 14.1, 14.6, 21, 22.3, 22.8, 23.9, 24.7, 25.3, 25.5, 26.4, 27.27.7, 28.4 and a relative absolute configuration of the three stereo axes of the dibenzo[d,f][1,3,2]dioxaphosphepin rings of R*,R*,S*, which comprises
crystallizing or recrystallizing said compound from a mixture of an aromatic hydrocarbon solvent and an alcohol of 4 to 8 carbon atoms; from a mixture of an aliphatic ketone and an alcohol; or from a mixture of an aromatic hydrocarbon solvent and an aliphatic ketone.

### Claim 3 (depends on 1)

A process according to claim 1 which comprises
seeding the melt with the novel beta crystalline form in order to increase the rate and efficiency of the melt crystallization.

### Claim 4 (depends on 1)

A process according to claim 1 wherein the melt is heated under reduced pressure of from 400 mm Hg to 0.1 mm Hg.

### Claim 5 (depends on 1)

A process according to claim 1 wherein the melt crystallization is carried out in an extruder or kneader.

### Claim 6

The beta, triclinic 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 200.degree.-207.degree. C. and by an X-ray diffraction pattern exhibiting lines of very high intensity at 8.4 and 17; lines of high intensity at 9.9, 10.6, 11.4, 17.5, 19.1, 20.2; lines of medium intensity at 4.6, 4.9, 7.1, 12.7, 13.2, 13.6, 15.3, 15.8, 16.4, 16.7, 18.4, 19.7, 21.7, 23.4; and lines of weak intensity at 7.8, 8.8, 9.4, 12, 14.1, 14.6, 21, 22.3, 22.8, 23.9, 24.7, 25.3, 25.5, 26.4, 27.27.7, 28.4 and a relative absolute configuration of the three stereo axes of the dibenzo[d,f][1,3,2]dioxaphosphepin rings of R*,R*,S*.

### Claim 7 (depends on 6)

A composition stabilized against thermal, oxidative and actinic induced degradation which comprises
(a) a polyolefin, and
(b) an effective amount of the beta crystalline form of 2,2',2"-nitrilo[triethyl-tris-(3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl-2, 2'-diyl)phosphite] according to claim 6.

### Claim 8 (depends on 7)

A composition according to claim 7 wherein the polyolefin is polypropylene.