Detail of "6390-69-8"

CAS Number:
6390-69-8
Name:
2,2'-Dihydroxy-3,3',5,5'-tetra-tert-butylbiphenyl
Molecular Structure:
Formula:
C₂₈H₄₂O₂
Molecular Weight:
410.6319
Synonyms:
2,2'-Biphenyldiol,3,3',5,5'-tetra-tert-butyl- (8CI);o,o'-Biphenol, 4,4',6,6'-tetra-tert-butyl-(6CI,7CI);2,2'-Dihydroxy-3,3',5,5'-tetra-tert-butyl-1,1'-biphenyl;3,3',5,5'-Tetra-tert-butyl-2,2'-biphenyldiol;3,3',5,5'-Tetra-tert-butyl-2,2'-bis(phenol);3,3',5,5'-Tetra-tert-butyl-2,2'-dihydroxy-1,1'-biphenyl;3,3',5,5'-Tetra-tert-butyl-2,2'-dihydroxybiphenyl;3,3',5,5'-Tetra-tert-butyl-[1,1'-biphenyl]-2,2'-diol;3,3',5,5'-Tetrakis(1,1-dimethylethyl)-[1,1'-biphenyl]-2,2'-diol;3,3',5,5'-Tetrakis(tert-butyl)biphenyl-2,2'-diol;4,4',6,6'-Tetra-tert-butyl-2,2'-biphenol;NSC 122714;
EINECS:
407-920-5
Density:
0.981 g/cm³
Boiling Point:
469.3 °C at 760 mmHg
Flash Point:
186.8 °C
Risk Codes:
53
Safety:
61 Details

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2,2-Dihydroxy-3,3,5,5-tetra-tert-butylbiphenyl

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Dibenzodioxaphosphepin and -dioxaphosphocin processing stabilizers: Dibenzodioxaphosphepin and -dioxaphosphocin processing stabilizers. Pastor, Stephen D.; Spivack, John D. (Ciba-Geigy A.-G. , Switz.). Eur. Pat. Appl. EP 108714 A1 16 May 1984, 24 pp. DESIGNATED STATES: R: DE, FR, GB, IT. (German). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C07F009-24; C08K005-51; C10M001-44. APPLICATION: EP 83-810463 7 Oct 1983. PRIORITY: US 82-434083 13 Oct 1982. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Section cross-reference(s): 29 The title compds. (I, R,R' = H, C1-18 alkyl, C5-6 cycloalkyl, C1-18 alkyl-substituted Ph; R2 = H, C1-12 alkyl, Ph; Z = C1-6 alkylene, C5-6 cycloalkylene; Z1 = C1-12 alkylidene or direct bond) are prepd. and used as heat stabilizers alone or in combination with light stabilizers and antioxidants in processing org. polymers and lubricants. Thus, I [R, R' = tert-Bu; R2 = Me; Z = (CH2)2; Z1 = direct bond] (II) [90420-47-6] was prepd. from PCl3, 3,3',5,5'-tetra-tert-butylbiphenyl-2,2'-diol [6390-69-8] and N-methylethanolamine [109-83-1]. During extrusion (288°) of polypropylene [9003-07-0] contg. 0.1% II, the internal extruder pressure was 109 kg/cm2 and the yellowness value (ASTM D1925-63T) of a sample heat-pressed from the extrudate granules was 4.8, compared with 95 and 5.1, resp., in the absence of stabilizer, and 109 and 12.1, resp., in the presence of 0.1% antioxidant.

Dioxasilepin and dioxasilocin stabilizers: Dioxasilepin and dioxasilocin stabilizers. Spivack, John D.; Pastor, Stephen D. (Ciba-Geigy A.-G. , Switz.). Eur. Pat. Appl. EP 114148 A2 25 Jul 1984, 25 pp. DESIGNATED STATES: R: BE, DE, FR, GB, IT, NL. (German). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C07F007-08; C07F007-04; C07F007-02; C09K015-32; C08K005-54. APPLICATION: EP 84-810007 6 Jan 1984. PRIORITY: US 83-457349 12 Jan 1983. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Section cross-reference(s): 29 Nine compds. I (R, R1 = H, C1-4 alkyl, Ph; RR1 = group II; Z = a bond, C1-7 alkylidene, S; R2 = C4-12 alkyl, C7-12 alkaryl, R3 = H, C1-12 alkyl, Ph) are prepd. for use as stabilizers for plastics such as polyolefins and PVC [9002-86-2]. Thus, Cl2SiHMe [75-54-7] in toluene was treated slowly at 5-10° with a soln. of 3,3',5,5'-tetra-tert-butyl-2,2'-dihydroxy-1,1'-biphenyl [6390-69-8] and Et3N in toluene to prep. 2,4,8,10-tetra-tert-butyl-6-methyldibenzo[d,f][1,3,2]dioxasilepin (III) [88946-07-0]. Isotactic polypropylene [25085-53-4] contg. 0.3% III was stable for 280 h in a test of light resistance, compared with 50-100 h for the unstabilized polymer.