US4396769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing crystalline, non-dusting bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate
Assignee: BASF Corp
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Filing: 1982-02-11
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Granted: 1983-08-02
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Expires: 2002-02-11
Abstract
Abstract Crystalline, non-dusting bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate is made by heating the sebacate ester to a temperature above its melting point and then slowly cooling the melt with agitation to form the product in a crystalline, non-dusting form. This ester, also known as TINUVIN 770, is a valuable commercial light stabilizer for a myriad of substrates.
Inventors
- 👤 Anibal L. Ferreira
- 👤 Robert E. Stahlbush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:18
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/40; C07D211/44; C07D211/46
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
108 words
A process for preparing bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate in a crystalline, non-dusting form having a particle size greater than 100 microns and with a volatiles content less than 0.5% by weight, which comprises heating bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, in the form of a friable, dusting powder or wet paste, to above its melting point, at a temperature between 83° and 95° C. under a pressure of 5 to 150 mm Hg with agitation to form a uniform melt of the sebacate, and then slowly cooling the melt, with continued agitation, to a temperature between 70° and 83° C. to cause the sebacate to crystallize from the melt in a crystalline, non-dusting form.
Claim 2
Dependent Claim
108 words
A process for preparing bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate in a crystalline, non-dusting form having a particle size greater than 100 microns and with a volatiles content less than 0.5% by weight, which comprises heating bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, in the form of a friable, dusting powder or wet paste, to above its melting point, at a temperature between 83° and 95° C. under a pressure of 5 to 150 mm Hg with agitation to form a uniform melt of the sebacate, and then slowly cooling the melt, with continued agitation, to a temperature between 70° and 83° C. to cause the sebacate to crystallize from the melt in a crystalline, non-dusting form.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein the bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate being heated is in the form of a wet paste.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein the bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate being heated is in the form of a friable, dusting powder.
Claim 5
Dependent Claim
59 words
A process according to claim 1 wherein the sebacate in form of a powder or wet paste is heated at a temperature between 83° and 88° C. under a pressure of 5 to 50 mm Hg and is then slowly cooled with agitation to a temperature between 72° and 74° C. to effect crystallization into a crystalline, non-dusting form.
References Cited (Backward Citations)
US3640928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |