US4461898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of novel light stabilizers
Assignee: BASF Corp
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Filing: 1982-11-01
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Granted: 1984-07-24
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Expires: 2002-11-01
Abstract
Abstract Mixtures of esters of polyalkylpiperidine derivatives, of the formulae I and II ##STR1## in which the proportions of I to II are 95 to 70% by weight and 5 to 30% by weight, are obtained by reacting about 2 mols of a piperidine of the formula III ##STR2## with 0.9 to 1.3 mols of a diester of the formula IV ##STR3## in the melt at between 100° and 145° C., in the presence of an alkali metal amide as a catalyst. The mixtures of esters thus obtained are very suitable as light stabilizers for plastics.
Inventors
- 👤 Anton Meier
- 👤 Eduard Troxler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:35
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/40; C07D211/44; C07D211/46; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A process for the preparation of a mixture of esters of polyalkylpiperidine derivatives, of the formulae I and II ##STR7## in which R 1 is hydrogen or methyl, R 2 is hydrogen, C 1-12 alkyl, C 3-8 alkenyl, C 7-11 aralkyl, cyanomethyl or C 2-4 acyl, R 3 is C 1-18 alkylene, C 2-18 oxaalkylene, C 2-18 thiaalkylene, C 2-18 azaalkylene or C 2-8 alkenylene, R 4 is C 1-4 alkyl and the proportions of the two esters vary between 95 to 70% by weight of I and 5 to 30% by weight of II, which comprises reacting about 2 mols of a piperidine of the formula III ##STR8## with 0.9 to 1.3 mols of a diester of the formula IV ##STR9## in which R 1 , R 2 , R 3 and R 4 are as defined above, in the melt at between 100° and 145° C., in the presence of an alkali metal amide as a catalyst.
Claim 2
Dependent Claim
159 words
A process for the preparation of a mixture of esters of polyalkylpiperidine derivatives, of the formulae I and II ##STR7## in which R 1 is hydrogen or methyl, R 2 is hydrogen, C 1-12 alkyl, C 3-8 alkenyl, C 7-11 aralkyl, cyanomethyl or C 2-4 acyl, R 3 is C 1-18 alkylene, C 2-18 oxaalkylene, C 2-18 thiaalkylene, C 2-18 azaalkylene or C 2-8 alkenylene, R 4 is C 1-4 alkyl and the proportions of the two esters vary between 95 to 70% by weight of I and 5 to 30% by weight of II, which comprises reacting about 2 mols of a piperidine of the formula III ##STR8## with 0.9 to 1.3 mols of a diester of the formula IV ##STR9## in which R 1 , R 2 , R 3 and R 4 are as defined above, in the melt at between 100° and 145° C., in the presence of an alkali metal amide as a catalyst.
Claim 3
Dependent Claim
18 words
A process according to claim 1, wherein the alcohol formed during the reaction is distilled off in vacuo.
Claim 4
Dependent Claim
57 words
A process according to claim 1, wherein a mixture of esters with proportions of 90 to 75% by weight of ester I and 10 to 25% by weight of ester II is obtained when using about 2 mols of a piperidine of the formula III and 1.1 to 1.25 mols of a diester of the formula IV.
Claim 5
Dependent Claim
20 words
A process according to claim 1, wherein the reaction is carried out at a temperature between 125° and 140° C.
Claim 6
Dependent Claim
14 words
A process according to claim 1, wherein lithium amide is used as the catalyst.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |