US4948888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of stabilizers for organic polymers
Assignee: ENICHEM SYNTHESIS SpA AN ITALIAN Co
•
Filing: 1987-07-27
•
Granted: 1990-08-14
•
Expires: 2007-07-27
Abstract
Abstract Stabilizers for organic polymers are disclosed, of the type of sterically hindered phenols or amines, which are obtained by means of the reaction of a sterically hindered phenol or amine bearing in the molecule at least in alkoxysilanol group with a mono- or poly-hydroxy aliphatic alcohol, by a transesterification reaction. The stabilizers so obtained are compatible with the organic polymers, wherein they remain stably.
Inventors
- 👤 Alberto Greco
- 👤 Luciano Pallini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:36
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K5/544; C08K5/5477; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/14; C07F7/18; C07F7/1804; C08K5/541; C08K5/5415; C08K5/5419
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
178 words
A process for the preparation of stabilizer compounds comprising reacting a sterically hindered amine compound of the following formulae: ##STR7## wherein R is selected from an aliphatic hydrocarbon and an oxyhydrocarbon group having 2 to 10 carbon atoms; R 2 is methyl; R 3 is selected from methyl and ethyl; R 4 is selected from a straight and branched chain alkyl group having from 1 to 10 carbon atoms; R5 is selected from a straight and branched chain alkylene group having from 2 to 5 carbon atoms; and n is selected from 0, 1 and 2, with a monohydroxy aliphatic alcohol having at least 6 carbon atoms or a polyhydroxy aliphatic alcohol having at least 4 carbon atoms, wherein the ratio of the methoxy or ethoxy groups to the alcoholic hydroxy groups in within the range of 1/1 to 3/1, under transesterification conditions and in the presence of a transesterification catalyst whereby methanol or ethanol is formed as a by product, continuously removing said by-product from the transesterification reaction and recovering said stabilizer compounds from said transesterification reaction.
Claim 2
Dependent Claim
178 words
A process for the preparation of stabilizer compounds comprising reacting a sterically hindered amine compound of the following formulae: ##STR7## wherein R is selected from an aliphatic hydrocarbon and an oxyhydrocarbon group having 2 to 10 carbon atoms; R 2 is methyl; R 3 is selected from methyl and ethyl; R 4 is selected from a straight and branched chain alkyl group having from 1 to 10 carbon atoms; R5 is selected from a straight and branched chain alkylene group having from 2 to 5 carbon atoms; and n is selected from 0, 1 and 2, with a monohydroxy aliphatic alcohol having at least 6 carbon atoms or a polyhydroxy aliphatic alcohol having at least 4 carbon atoms, wherein the ratio of the methoxy or ethoxy groups to the alcoholic hydroxy groups in within the range of 1/1 to 3/1, under transesterification conditions and in the presence of a transesterification catalyst whereby methanol or ethanol is formed as a by product, continuously removing said by-product from the transesterification reaction and recovering said stabilizer compounds from said transesterification reaction.
Claim 3
Dependent Claim
39 words
The process of claim 1, wherein the aliphatic mono- or polyhydroxyalcohol is selected from hexanol, octanol, ethylhexanol, caprylic alcohol, cetyl alcohol, lauryl alcohol, stearyl alcohol, diethylene glycol monobutyl ether, butanediol, pentanediol, hexanediol, decanediol, 2,2,-dimethylpropanediol, diethylene glycol, pentaerythritaol and trimethylolpropane.
Claim 4
Dependent Claim
32 words
The process of claim 1, wherein the transesterification catalyst is sodium methoxide which is present in an amount of from 0.2 to 2% by weight based on the weight of the reactants.
Claim 5
Dependent Claim
61 words
The process of claim 1, further comprising conducting the transesterification reaction in the absence of solvents or diluents at a temperature of from 100° to 150° C., under reduced pressure or under a flow of inert gas, or under reduced pressure and under a flow or inert gas, until the stabilizer compound recovered has a molecular weight of at least 200.
Claim 6
Dependent Claim
21 words
The process of claim 4, wherein the stabilizer compound has a molecular weight in the range of from 300 to 1000.
Claim 7
Dependent Claim
18 words
The process of claim 1, wherein the transesterification reaction is carried out for 20 minutes to 4 hours.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein the reaction temperature is from 100° C. to 150° C.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein said transesterification catalyst is neutralized catalyst residue is removed after the reaction is completed.
Claim 10
Dependent Claim
21 words
The process of claim 8 wherein said neutralizing agent is acetic acid and said transesterification catalyst residue is removed by filtration.
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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |