EP0182415A2
Expired / Lapsed
EP
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Process for the preparation of stabilizers for organic polymers and stabilizers so obtained
Assignee: Enichem Sintesi SpA
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Filing: 1985-10-30
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Granted: —
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Expires: 2005-10-30
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 an 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
EP
Data Source
google_patents
Last Synchronized
2026-10-28 09:30
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/14; C07F7/18; C07F7/1804; C08; C08K; C08K5/00; C08K5/54; C08K5/541; C08K5/5415; C08K5/5419; C08K5/544; C08K5/5477
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
Process for the preparation of stabilizer compounds of the type of sterically hindered phenols or amines, char acterized in that a phenol or an amine sterically hindered and bearing at least one methoxysilanol or ethoxysilanol group in the molecule is reacted with a monohydroxy aliphatic al cohol containing at least 6 carbon atoms in its molecule, or with a polyhydroxy aliphatic alcohol containing at least 4 carbon atoms in its molecule, with a ratio of the methoxy or ethoxy groups to the alcoholic hydroxy groups comprised within the range of from 1/1 to 3/1, by operating under transesterification conditions, in the presence of a transesterification catalyst and continuously eliminating the methanol or the ethanol as they are formed as by-products of the transesterification reaction, and that said product of the transesterification reaction is recovered.
Claim 2
Dependent Claim
134 words
Process for the preparation of stabilizer compounds of the type of sterically hindered phenols or amines, char acterized in that a phenol or an amine sterically hindered and bearing at least one methoxysilanol or ethoxysilanol group in the molecule is reacted with a monohydroxy aliphatic al cohol containing at least 6 carbon atoms in its molecule, or with a polyhydroxy aliphatic alcohol containing at least 4 carbon atoms in its molecule, with a ratio of the methoxy or ethoxy groups to the alcoholic hydroxy groups comprised within the range of from 1/1 to 3/1, by operating under transesterification conditions, in the presence of a transesterification catalyst and continuously eliminating the methanol or the ethanol as they are formed as by-products of the transesterification reaction, and that said product of the transesterification reaction is recovered.
Claim 3
Dependent Claim
126 words
Process according to claim 1, characterized in that said phenol or amine sterically hindered and bearing 'at least one methoxysilanol or ethoxysilanol group are selected from the classes of compounds to be defined by means of the following formulae: wherein: R represents an aliphatic hydrocarbon or oxyhydrocarbon group, containing from 2 to 10 carbon atoms; R 1 represent independently alkyl radical containing from 1 to 10 carbon atoms and preferably the tert.butyl radical; R 2 represent the methyl radical; R 3 represent independently the methyl or ethyl radical; R 4 represents a straight or branched alkyl group, containing from 1 to 10 carbon atoms; R 5 represents a straight or branched alkylene radical containing from 2 to 5 carbon atoms; n is 0, 1 or 2.
Claim 4
Dependent Claim
40 words
Process according to claim 1, characterized in that the aliphatic mono- orpoly-hydroxyalcohol is selected among: hexanol, octanol, ethylhexanol, caprylic alcohol, cetyl alcohol, lauryl alcohol, stearyl alcohol, diethylene glycol monobutyl ether, butanediol, pentanediol, hexanediol, decanediol, 2,2-dimethylpropanediol, diethylene glycol, pentaerythritol and trimethylolpropane.
Claim 5
Dependent Claim
31 words
Process acccrding to claim 1, characterized in that the transesterification catalyst is sodium methoxide, in an amount comprised,within the range of from 0.2 to 2% by weight relatively to the reactants.
Claim 6
Dependent Claim
52 words
Process according to claim 1, characterized in that the reaction is carried out in the absence of solvents or of diluents, at a temperature of from 100 to 150°C, under reduced pressure, and/or under a flow of inert gas, until a molecular weight of the reaction product greater than 200 is obtained.
Claim 7
Dependent Claim
31 words
Process according to claim 5, characterized in that the reaction is continued until a molecular weight of the reaction product comprised within the range of from 300 to 1000 is obtained.
Claim 8
Dependent Claim
25 words
Process according to claims 1, 5 and 6, characterized in that the reaction is carried out for times of from 30 minutes to 4 hours.
Claim 9
Dependent Claim
13 words
Stabilizer compounds obtained according to the process of claims from 1 to 7.
Claim 10
Dependent Claim
29 words
Stabilized polymeric compositions containing an organic polymer and a stabilizing amount of at least one of the stabilizers obtained according to the process of claims from 1 to 7.
References Cited (Backward Citations)
No citation records indexed.
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