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US4405807A
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Tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane having a novel crystal structure and process for production thereof
Assignee: Mitsui Chemicals Inc
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Filing: 1981-01-13
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Granted: 1983-09-20
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Expires: 2001-01-13
Abstract
Abstract Novel tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl)methane having a novel crystal structure characterized by the fact that its X-ray diffraction pattern obtained by X-ray analysis using Cu-K alpha rays shown a sharp peak at a diffraction angle 2 theta =10.90 DEG . The above compound can be prepared by (a) transesterifying methyl or ethyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate with pentaerythritol in the presence of a compound of the formula <IMAGE> wherein R1 and R2 each represent an alkyl group having 1 to 6 carbon atoms, (b) treating the resulting tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl)methane with a lower alkanol capable of forming a molecular adduct compound therewith to convert it into the corresponding molecular adduct compound, and (c) recrystallizing the molecular adduct compound from ethanol as a solvent.
Inventors
- 👤 Hiroshi Hasui
- 👤 Toshikazu Furihata
- 👤 Kazuko Takanashi
- 👤 Masahiko Ohmori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:48
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/134; C08K5/1345
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
32 words
Tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]-methane having a novel crystal structure characterized by the fact that its X-ray diffraction pattern obtained by X-ray analysis using Cu-K 60 rays shown a sharp peak at a diffraction angle 2θ=10.90°.
Claim 2
Dependent Claim
32 words
Tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]-methane having a novel crystal structure characterized by the fact that its X-ray diffraction pattern obtained by X-ray analysis using Cu-K 60 rays shown a sharp peak at a diffraction angle 2θ=10.90°.
Claim 3
Dependent Claim
24 words
The compound of claim 1 which gives the X-ray pattern shown in FIG. 1 when it was subjected to X-ray analysis using Cu-K.sub.α rays.
Claim 4
Dependent Claim
21 words
The compound of claim 1 which has a melting point in the range of about 111° C. to about 118° C.
Claim 5
Dependent Claim
112 words
A process for producing tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane having a novel crystal structure characterized by the fact that its X-ray diffraction pattern obtained by X-ray analysis using Cu-K 60 rays shows a sharp peak at a diffraction angle 2θ=10.90°, said process comprising (a) transesterifying methyl or ethyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate with pentaerythritol in the presence of a compound of the formula ##STR8## wherein R 1 and R 2 each represent an alkyl group having 1 to 6 carbon atoms, (b) treating the resulting tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane with a lower alkanol capable of forming a molecular adduct compound therewith to convert it into the corresponding molecular adduct compound, and (c) recrystallizing the molecular adduct compound from ethanol as a solvent.
Claim 6
Dependent Claim
112 words
A process for producing tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane having a novel crystal structure characterized by the fact that its X-ray diffraction pattern obtained by X-ray analysis using Cu-K 60 rays shows a sharp peak at a diffraction angle 2θ=10.90°, said process comprising (a) transesterifying methyl or ethyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate with pentaerythritol in the presence of a compound of the formula ##STR8## wherein R 1 and R 2 each represent an alkyl group having 1 to 6 carbon atoms, (b) treating the resulting tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane with a lower alkanol capable of forming a molecular adduct compound therewith to convert it into the corresponding molecular adduct compound, and (c) recrystallizing the molecular adduct compound from ethanol as a solvent.
Claim 7
Dependent Claim
32 words
The process of claim 4 wherein the amount of the compound of formula (III) is 0.3 to 2 parts by weight per 100 parts by weight of the methyl or ethyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate.
Claim 8
Dependent Claim
18 words
The process of claim 5 wherein the lower alkanol is an alkanol having 3 or 4 carbon atoms.
Claim 9
Dependent Claim
12 words
Use of the compound of claim 1 as an antioxidant for polyolefins.
References Cited (Backward Citations)
AU288839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |