JP2011021136A - Polymer stabilizer, and polymer composition containing the polymer stabilizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new polymer stabilizer for imparting excellent working stability to a polymer composition when a polymer is molded at high temperature. <P>SOLUTION: The polymer stabilizer contains a 13-20C condensed polycyclic hydrocarbon having a structure represented by formula (1) (X denotes an oxygen atom or a sulfur atom), wherein, the condensed polycyclic hydrocarbon has aromatic properties, an oxygen atom, a nitrogen atom and a sulfur atom may be substituted for each of carbon atoms which constitute the condensed polycyclic hydrocarbon, and a halogen atom, a cyano group, a 1-4C alkyl group, a 1-4C alkoxy group, a 1-4C alkylthio group or a 6-12C aryl group may be substituted for each of hydrogen atoms contained in the condensed polycyclic hydrocarbon. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a polymer stabilizer and a polymer composition containing the stabilizer.

Various polymer stabilizers are used to improve the processing stability of the polymer composition when the polymer is molded (for example, Non-Patent Document 1).

Seiichi Honma, 1. Basic Comprehensive Explanation, Molding Technology Useful in the Field-Materials and Molding Technology, Plastic April 2002 issue, 4th volume, published by Kogyo Kenkyukai

  Recently, there are cases where a polymer is molded at a high temperature, and there is a need for a novel polymer stabilizer that imparts excellent processing stability to a polymer composition when the polymer is molded at a high temperature.

（式中、Ｘは、酸素原子又は硫黄原子を表す。）
で表される構造を有する炭素数１３〜２０の縮合多環炭化水素を含有することを特徴とするポリマー安定剤；
（但し、該縮合多環炭化水素は芳香族性を有しており、該縮合多環炭化水素を構成する炭素原子は、酸素原子、窒素原子、硫黄原子で置換されていてもよく、該縮合多環炭化水素に含まれる水素原子は、ハロゲン原子、シアノ基、炭素数１〜４のアルキル基、炭素数１〜４のアルコキシ基、炭素数１〜４のアルキルチオ基又は炭素数６〜１２のアリール基に置換されていてもよい。） Under such circumstances, as a result of intensive studies, the present inventors have reached the inventions described in the following [1] to [5]. That is, the present invention
[1] Formula (1)

(In the formula, X represents an oxygen atom or a sulfur atom.)
A polymer stabilizer comprising a condensed polycyclic hydrocarbon having 13 to 20 carbon atoms and having a structure represented by:
(However, the condensed polycyclic hydrocarbon has aromaticity, and the carbon atom constituting the condensed polycyclic hydrocarbon may be substituted with an oxygen atom, a nitrogen atom, or a sulfur atom. The hydrogen atom contained in the polycyclic hydrocarbon is a halogen atom, a cyano group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkylthio group having 1 to 4 carbon atoms, or a carbon atom having 6 to 12 carbon atoms. It may be substituted with an aryl group.)

（式中、Ｘは前記と同じ意味を表し、Ｒはハロゲン原子、シアノ基、炭素数１〜４のアルキル基、炭素数１〜４のアルコキシ基、炭素数１〜４のアルキルチオ基又は炭素数６〜１２のアリール基を表す。）
で表される化合物であることを特徴とする［１］記載のポリマー安定剤；
［３］ ［１］又は［２］のいずれか記載のポリマー安定剤及びポリマーを含有することを特徴とするポリマー組成物；
［４］ ポリマー１００重量部に対し、ポリマー安定剤に含まれる式（１）で表される構造を有する縮合多環炭化水素を0.0005〜5重量部含有することを特徴とする［３］記載のポリマー組成物； [2] The condensed polycyclic hydrocarbon is represented by the formula (2)

(In the formula, X represents the same meaning as described above, and R represents a halogen atom, a cyano group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkylthio group having 1 to 4 carbon atoms, or a carbon number. Represents 6-12 aryl groups.)
A polymer stabilizer according to [1], which is a compound represented by the formula:
[3] A polymer composition comprising the polymer stabilizer according to any one of [1] and [2] and a polymer;
[4] The polycyclic hydrocarbon having a structure represented by the formula (1) contained in the polymer stabilizer is contained in an amount of 0.0005 to 5 parts by weight per 100 parts by weight of the polymer. A polymer composition;

（式中、Ｘは、酸素原子又は硫黄原子を表す。）
で表される構造を有する炭素数１３〜２０の縮合多環炭化水素
（但し、該縮合多環炭化水素は芳香族性を有しており、該縮合多環炭化水素を構成する炭素原子は、酸素原子、窒素原子、硫黄原子で置換されていてもよく、該縮合多環炭化水素に含まれる水素原子は、ハロゲン原子、シアノ基、炭素数１〜４のアルキル基、炭素数１〜４のアルコキシ基、炭素数１〜４のアルキルチオ基又は炭素数６〜１２のアリール基に置換されていてもよい。）
のポリマー安定剤としての使用；
等である。 [5] Formula (1)

(In the formula, X represents an oxygen atom or a sulfur atom.)
A condensed polycyclic hydrocarbon having 13 to 20 carbon atoms having a structure represented by the formula (provided that the condensed polycyclic hydrocarbon has aromaticity, and the carbon atoms constituting the condensed polycyclic hydrocarbon are: The hydrogen atom contained in the condensed polycyclic hydrocarbon may be a halogen atom, a cyano group, an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 1 to 4 carbon atoms. (It may be substituted with an alkoxy group, an alkylthio group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.)
As a polymer stabilizer;
Etc.

  The polymer stabilizer of the present invention imparts excellent processing stability to a polymer composition containing it.

Hereinafter, the present invention will be described in detail.
The present invention contains a polymer-stable polycyclic hydrocarbon having 13 to 20 carbon atoms having a structure represented by the above formula (1) (hereinafter sometimes referred to as compound (1)). Contains agents.
X contained in the compound (1) is an oxygen atom or a sulfur atom, preferably an oxygen atom.
Compound (1) has aromaticity.
The carbon atom constituting the compound (1) may be substituted with an oxygen atom, a nitrogen atom, or a sulfur atom, and the hydrogen atom contained in the compound (1) is a halogen atom, a cyano group, a methyl group, an ethyl group, C1-C4 alkyl groups such as isopropyl group and t-butyl group, C1-C4 alkoxy groups such as methoxy group and ethoxy group, C1-C4 alkylthio groups such as methylthio group, and phenyl groups Which may be substituted with an aryl group having 6 to 12 carbon atoms.

Examples of the compound (1) include compounds represented by the following formulas (2) to (11).

  In the formulas (2) to (11), X each independently represents an oxygen atom or a sulfur atom, preferably an oxygen atom. Y represents an oxygen atom, a nitrogen atom, and a sulfur atom each independently. Each R is independently an alkyl group having 1 to 4 carbon atoms such as a halogen atom, a cyano group, a methyl group, an ethyl group, an isopropyl group or a t-butyl group; C1-C4 alkylthio groups, such as an alkoxy group and a methylthio group, or C6-C12 aryl groups, such as a phenyl group, are represented.

  Examples of the compound (1) include 5H-dibenzo [a, d] cyclohepten-5-one, 2-methoxy 5H-dibenzo [a, d] cyclohepten-5-one, 5H-benzo [4,5] cyclohepta [ 1,2-b] naphthalen-5-one, 7H-benzo [4,5] cyclohepta [1,2-a] naphthalene-7-one, 2-chloro 5H-dibenzo [a, d] cyclohepten-5-one 3-methylthio 5H-dibenzo [a, d] cyclohepten-5-one, 5H-dibenzo [a, d] cycloheptene-5-thione, 4H-cyclohepta [1,2-b: 5,4-b '] dithiophene -4-one, 9H-thieno [3 ', 4': 5,6] cyclohepta [1,2-b] thiophene-9-one, 4H-benzo [4,5] cyclohepta [1,2-b] thiophene -4-one, 4H-benzo [4,5] cyclohepta [1,2-b] furan-4-one, 10H-benzo [5,6] cyclohepta [1,2-b] furan-10-one, 11H -Benzo [5,6] cyclohepta [1,2-b] pyridin-11-one, 5H-benzo [4,5] cyclohepta [1,2-b] pyridin-5-one, 11H-benzo [5,6 Cyclo Descriptor [1, 2-c] pyridin-11-one, such as 8-methyl 5H- benzo [4,5] cyclohepta [1,2-b] pyridin-5-one and the like.

  As the compound (1), a compound represented by the formula (2) is preferable, and 5H-dibenzo [a, d] cyclohepten-5-one is particularly preferable.

Compound (1) can be prepared by, for example, the method described in pages 295-297 of Precision Organic Synthesis-Experimental Manual-Second Revised Edition, LFTietze, ThEicher (Joint translation by Seiichi Takano and Kunio Ogasawara) .
In addition, as compound (1), for example, 5H-dibenzo [a, d] cyclohepten-5-one and the like are commercially available from Tokyo Chemical Industry Co., Ltd., so that a commercially available product may be used as it is.

The polymer stabilizer of the present invention contains compound (1). The polymer stabilizer may be composed only of the compound (1), for example, an antioxidant such as a phenol-based antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, an ultraviolet absorber, a light Stabilizer, metal deactivator, nucleating agent, lubricant, antistatic agent, flame retardant, filler, pigment, plasticizer, flame retardant, anti-blocking agent, surfactant, foaming agent, emulsifier, brightener, medium It may be a mixture of additives such as a compatibilizer and a binder and the compound (1).
As content of the compound (1) in a polymer stabilizer, the range of 0.001 weight part-100 weight part etc. can be mentioned with respect to 100 weight part of polymer stabilizers.

  Examples of phenolic antioxidants include pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], n-octadecyl-β- (4′hydroxy-3 ′, 5 ′. -Di-t-butylphenyl) propionate, 3,9-bis [1,1-dimethyl-2- [β- (3-t-butyl-4-hydroxy-5-methylfienyl) propionyloxy] ethyl] 2 , 4,8,10-tetraoxaspiro [5,5] -undecane, 2- [1- (2-hydroxy-3,5-di-t-pentylphenyl) ethyl] -4,6-di-t- Pentylphenyl acrylate, 2-t-butyl-6- (3-tert-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2,6-di-tert-butyl-4-methylphenol, 2,4,6-tri-t-butylphenol, 2,6-di-t-butylphenol 2-tert-butyl-4,6-dimethylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butylphenol, 2,6 -Di-t-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol, 2- (α-methylcyclohexyl) -4,6-dimethylphenol, 2,6-diocudadecyl-4-methylphenol 2,4,6-tricyclohexylphenol, 2,6-di-t-butyl-4-methoxymethylphenol, 2,6-di-nonyl-4-methylphenol, 2,4-dimethyl-6- (1 '-Methylundecyl-1'-yl) phenol, 2,4-dimethyl-6- (1'-methylheptadecyl-1'-yl) phenol, 2,4-dimethyl-6- (1'- Chirutorideshiru-1'-yl) phenol and alkylated monophenols, such as a mixture thereof,

Alkylthiomethylphenols such as 2,4-dioctylthiomethyl-6-tert-butylphenol, 2,4-dioctylthiomethyl-6-ethylphenol, 2,6-didodecylthiomethyl-4-nonylphenol and mixtures thereof;

2,6-di-t-butyl-4-methoxyphenol, 2,5-di-t-butylhydroquinone, 2,5-di-t-amylhydroquinone, 2,6-diphenyl-4-octadecyloxyphenol, 2 , 6-di-t-butylhydroquinone, 2,5-di-t-butyl-4-hydroxyanisole, 3,5-di-t-butyl-4-hydroxyphenyl stearate, bis (3,5-di- t-butyl-4-hydroxyphenyl) hydroquinone and alkylated hydroquinone such as adipate and mixtures thereof;

tocopherols such as α-tocopherol, β-tocopherol, γ-tocopherol, δ-tocopherol and mixtures thereof;

2,2′-thiobis (6-tert-butylphenol), 2,2′-thiobis (4-methyl-6-tert-butylphenol), 2,2′-thiobis (4-octylphenol), 4,4′-thiobis (3-methyl-6-tert-butylphenol), 4,4′-thiobis (2-methyl-6-tert-butylphenol), 4,4′-thiobis (3,6-di-tert-amylphenol), 4 , 4 ′-(2,6-dimethyl-4-hydroxyphenyl) disulfide and the like, hydroxylated thiodiphenyl ether,

2,2′-methylenebis (4-methyl-6-tert-butylphenol), 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 2,2′-methylenebis [4-methyl-6- ( α-methylcyclohexyl) phenol)], 2,2′-methylenebis (4-methyl-6-cyclohexylphenol), 2,2′-methylenebis (4-methyl-6-nonylphenol), 2,2′-methylenebis (4 , 6-di-t-butylphenol), 2,2′-ethylidenebis (4,6-di-t-butylphenol), 2,2′-ethylidenebis (4-isobutyl-6-t-butylphenol), 2, 2′-methylenebis [6- (α-methylbenzyl) -4-nonylphenol], 2,2′-methylenebis [6- (α, α-dimethylbenzyl) -4 Nonylphenol], 4,4′-methylenebis (6-tert-butyl-2-methylphenol), 4,4′-methylenebis (2,6-di-tert-butylphenol), 4,4′-butylidenebis (3-methyl) -6-tert-butylphenol), 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (5-tert-butyl-4-hydroxy-2-methylphenyl) butane, 2,6-bis ( 3-t-butyl-5-methyl-2-hydroxybenzyl) -4-methylphenol, 1,1,3-tris (5-t-butyl-4-hydroxy-2-methylphenyl) butane, 1,1- Bis (5-t-butyl-4-hydroxy-2-methylphenyl) -3-n-dodecylmercaptobutane, ethylene glycol bis [3,3-bis-3′-t-butyl 4'-hydroxyphenyl) butyrate], bis (3-t-butyl-4-hydroxy-5-methylphenyl) dicyclopentadiene, bis [2- (3'-t-butyl-2'-hydroxy-5'-) Methylbenzyl) -6-tert-butyl-4-methylphenyl] terephthalate, 1,1-bis (3,5-dimethyl-2-hydroxyphenyl) butane, 2,2-bis (3,5-di-t-) Butyl-4-hydroxyphenyl) propane, 2,2-bis (5-tert-butyl-4-hydroxy-2-methylphenyl) -4-n-dodecylmercaptobutane, 1,1,5,5-tetra (5 Alkylidene bisphenols and derivatives thereof such as -t-butyl-4-hydroxy-2-methylphenyl) pentane and mixtures thereof;

3,5,3 ′, 5′-tetra-t-butyl-4,4′-dihydroxydibenzyl ether, octadecyl-4-hydroxy-3,5-dimethylbenzyl mercaptoacetate, tris (3,5-di-t -Butyl-4-hydroxybenzyl) amine, bis (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) dithioterephthalate, bis (3,5-di-t-butyl-4-hydroxybenzyl) sulfide O-benzyl derivatives such as isooctyl-3,5-di-t-butyl-4-hydroxybenzyl mercaptoacetate and mixtures thereof, N-benzyl derivatives and S-benzyl derivatives,

Dioctadecyl-2,2-bis (3,5-di-t-butyl-2-hydroxybenzyl) malonate, dioctadecyl-2- (3-t-butyl-4-hydroxy-5-methylbenzyl) malonate, di Dodecyl mercaptoethyl-2,2-bis (3,5-di-t-butyl-4-hydroxybenzyl) malonate, bis [4- (1,1,3,3-tetramethylbutyl) phenyl] -2,2 Hydroxybenzylated malonate derivatives such as bis (3,5-di-tert-butyl-4-hydroxybenzyl) malonate and mixtures thereof;

1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, 1,4-bis (3,5-di-t-butyl-4 -Hydroxybenzyl) -2,3,5,6-tetramethylbenzene, 2,4,6-tris (3,5-t-butyl-4-hydroxybenzyl) phenol and mixtures thereof ,

2,4-bis (n-octylthio) -6- (4-hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, 2-n-octylthio-4,6-bis (4 -Hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, 2-n-octylthio-4,6-bis (4-hydroxy-3,5-di-t-butylphenoxy)- 1,3,5-triazine, 2,4,6-tris (3,5-di-tert-butyl-4-phenoxy) -1,3,5-triazine, tris (4-tert-butyl-3-hydroxy) -2,6-dimethylbenzyl) isocyanurate, tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate, 2,4,6-tris (3,5-di-t-butyl-4) -Hydroxyphenylethyl) -1,3,5 Triazine, 2,4,6-tris (3,5-di-tert-butyl-4-hydroxyphenylpropyl) -1,3,5-triazine, tris (3,5-dicyclohexyl-4-hydroxybenzyl) isocyanurate , Triazine derivatives such as tris [2- (3 ′, 5′-di-t-butyl-4′-hydroxycinnamoyloxy) ethyl] isocyanurate and mixtures thereof;

Dimethyl-3,5-di-t-butyl-4-hydroxybenzylphosphonate, diethyl-3,5-di-t-butyl-4-hydroxybenzylphosphonate, dioctadecyl-3,5-di-t-butyl-4 -Hydroxybenzylphosphonate, dioctadecyl-5-t-butyl-4-hydroxy-3-methylbenzylphosphonate, calcium salt of 3,5-di-t-butyl-4-hydroxybenzylphosphonic acid monoester, and mixtures thereof A benzylphosphonate derivative of

Acylaminophenol derivatives such as 4-hydroxylauric acid anilide, 4-hydroxystearic acid anilide, octyl-N- (3,5-di-t-butyl-4-hydroxyphenyl) carbanate and mixtures thereof;

β- (3,5-di-t-butyl-4-hydroxyphenyl) propionic acid and methanol, ethanol, octanol, octadecanol, ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1, 6-hexanediol, 1,9-nonanediol, neopentyl glycol, diethylene glycol, thioethylene glycol, spiro glycol, triethylene glycol, pentaerythritol, tris (hydroxyethyl) isocyanurate, N, N′-bis (hydroxyethyl) Oxamide, 3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo [2,2,2] octane And so Esters with mono- or polyhydric alcohols, such as mixtures of al,

β- (3,5-dicyclohexyl-4-hydroxyphenyl) propionic acid and methanol, ethanol, octanol, octadecanol, ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol 1,9-nonanediol, neopentyl glycol, diethylene glycol, thioethylene glycol, spiro glycol, triethylene glycol, pentaerythritol, tris (hydroxyethyl) isocyanurate, N, N′-bis (hydroxyethyl) oxamide, 3- Thiaundecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo [2,2,2] octane and Esters of monohydric alcohols or polyhydric alcohols such as a mixture of these,

3,5-di-t-butyl-4-hydroxyphenylacetic acid and methanol, ethanol, octanol, octadecanol, ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, 1,9-nonanediol, neopentyl glycol, diethylene glycol, thioethylene glycol, spiro glycol, triethylene glycol, pentaerythritol, tris (hydroxyethyl) isocyanurate, N, N′-bis (hydroxyethyl) oxamide, 3-thia Undecanol, 3-thiapentadecanol, trimethylhexanediol, trimethylolpropane, 4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo [2,2,2] octane and mixtures thereof Esters of mono- or polyhydric alcohols,

N, N′-bis [3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionyl] hydrazine, N, N′-bis [3- (3 ′, 5′-di-) t-butyl-4′-hydroxyphenyl) propionyl] hexamethylenediamine, N, N′-bis [3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionyl] trimethylenediamine and Examples thereof include amides of β- (3,5-di-t-butyl-4-hydroxyphenyl) propionic acid such as a mixture thereof.
Two or more different phenolic antioxidants may be used in combination.

  Particularly preferably, pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], n-octadecyl-β- (4′hydroxy-3 ′, 5′-di-t- Butylphenyl) propionate 3,9-bis [1,1-dimethyl-2- [β- (3-t-butyl-4-hydroxy-5-methylfienyl) propionyloxy] ethyl] 2,4,8, 10-tetraoxaspiro [5,5] -undecane, 2- [1- (2-hydroxy-3,5-di-t-pentylphenyl) ethyl] -4,6-di-t-pentylphenyl acrylate, 2 -T-butyl-6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate and the like.

Examples of phosphorus antioxidants include triphenyl phosphite, tris (nonylphenyl) phosphite, tris (2,4-di-t-butylphenyl) phosphite, 6- [3- (3-t-butyl- 4-hydroxy-5-methylphenyl) propoxy] -2,4,6,8,10-tetra-t-butyldibenzo [d, f] [1.3.2] dioxaphosphine, trilauryl phosphite , Trioctadecyl phosphite, distearyl pentaerythritol diphosphite, diisodecyl pentaerythritol diphosphite, bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite, bis (2,4-di-t-butyl-6-methylphenyl) ) Pentaerythritol diphosphite, bis (2,6-di-t-butyl) 4-methylphenyl) pentaerythritol diphosphite, bis (2,4,6-tri-t-butylphenyl) pentaerythritol diphosphite, tristearyl sorbitol triphosphite, tetrakis (2,4-di-t-butylphenyl) -4, 4'-diphenylenediphosphonite, 2,2'-methylenebis (4,6-di-t-butylphenyl) 2-ethylhexyl phosphite, 2,2'-ethylidenebis (4,6-di-t-butyl) Phenyl) fluorophosphite, bis (2,4-di-t-butyl-6-methylphenyl) ethyl phosphite, bis (2,4-di-t-butyl-6-methylphenyl) methyl phosphite, 2- (2,4,6-Tri-t-butylphenyl) -5-ethyl-5-butyl-1,3,2-oxaphos Linnan, 2,2 ′, 2 ″ -nitrilo [triethyl-tris (3,3 ′, 5,5′-tetra-tert-butyl-1,1′-biphenyl-2,2′-diyl) phosphite and A mixture thereof may be mentioned.
Two or more different phosphorus antioxidants may be mixed and used.
In particular, tris (2,4-di-t-butylphenyl) phosphite, 6- [3- (3-t-butyl-4-hydroxy-5-methylphenyl) propoxy] -2,4,6,8, Examples include 10-tetra-t-butyldibenzo [d, f] [1.3.2] dioxaphosphine.

Examples of the sulfur-based antioxidant include 2,4-bis [(octylthio) methyl] -O-octresol, 4,6-bis (dodecylthiomethyl) -O-cresol, dilauryl 3,3′-thiodipropio , Tridecyl 3,3'-thiodipropionate, dimyristyl 3,3'-thiodipropionate, distearyl 3,3'-thiodipropionate, lauryl stearyl 3,3'-thiodipropionate, neopentane And tetrayltetrakis (3-laurylthiopropionate).
Two or more different sulfur-based antioxidants may be mixed and used.
Particularly preferred is dimyristyl-3,3′-thiodipropionic acid ester.

  Examples of the ultraviolet absorber include phenyl salicylate, 4-t-butylphenyl salicylate, 2,4-di-t-butylphenyl 3 ′, 5′-di-t-butyl-4′-hydroxybenzoate, 4-t- Octylphenyl salicylate, bis (4-t-butylbenzoyl) resorcinol, benzoylresorcinol, hesisadecyl 3 ′, 5′-di-t-butyl-4′-hydroxybenzoate, octadecyl 3 ′, 5′-di-t-butyl- Salicylate derivatives such as 4′-hydroxybenzoate, 2-methyl-4,6-di-t-butylphenyl 3 ′, 5′-di-t-butyl-4′-hydroxybenzoate and mixtures thereof;

2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, bis (5-benzoyl-4-hydroxy-2- 2-hydroxybenzophenone derivatives such as methoxyphenyl) methane, 2,2 ′, 4,4′-tetrahydroxybenzophenone and mixtures thereof;

2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (3 ′, 5′-di-t-butyl-2′-hydroxyphenyl) benzotriazole, 2- (2′-hydroxy-3′-) t-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (5'-t-butyl-2'-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-octyl) Phenyl) benzotriazole, 2- (3-t-butyl-2-hydroxy-5-methylphenyl) -5-chlorobenzotriazole, 2- (3′-s-butyl-2′-hydroxy-5′-t-) Butylphenyl) benzotriazole, 2- (2′-hydroxy-4′-octyloxyphenyl) benzotriazole, 2- (3 ′, 5′-di-t-amyl-2′-hydroxyphenyl) Benzotriazole, 2- [2′-hydroxy-3 ′, 5′-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2-[(3′-t-butyl-2′-hydroxyphenyl) ) -5 '-(2-octyloxycarbonylethyl) phenyl] -5-chlorobenzotriazole, 2- [3'-t-butyl-5'-[2- (2-ethylhexyloxy) carbonylethyl] -2 ' -Hydroxyphenyl] -5-chlorobenzotriazole, 2- [3'-t-butyl-2'-hydroxy-5 '-(2-methoxycarbonylethyl) phenyl] -5-chlorobenzotriazole, 2- [3'-T-butyl-2'-hydroxy-5'-(2-methoxycarbonylethyl) phenyl] benzotriazole, 2- [3'-t-butyl-2'-hydroxy-5- ( -Octyloxycarbonylethyl) phenyl] benzotriazole, 2- [3'-t-butyl-2'-hydroxy-5 '-[2- (2-ethylhexyloxy) carbonylethyl] phenyl] benzotriazole, 2- [2 -Hydroxy-3- (3,4,5,6-tetrahydrophthalimidomethyl) -5-methylphenyl] benzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chlorobenzo Triazole, 2- (3′-dodecyl-2′-hydroxy-5′-methylphenyl) benzotriazole and 2- [3′-tert-butyl-2′-hydroxy-5 ′-(2-isooctyloxycarbonylethyl) ) Phenyl] benzotriazole mixture, 2,2′-methylenebis [6- (2H-benzotriazol-2-yl) 4- (1,1,3,3-tetramethylbutyl) phenol, 2,2′-methylenebis [4-tert-butyl-6- (2H-benzotriazol-2-yl) phenol], poly (3-11 ) (Ethylene glycol) and 2- [3′-t-butyl-2′-hydroxy-5 ′-(2-methoxycarbonylethyl) phenyl] benzotriazole, poly (3-11) (ethylene glycol) And methyl 3- [3- (2H-benzotriazol-2-yl) -5-tert-butyl-4-hydroxyphenyl] propionate, 2-ethylhexyl 3- [3-tert-butyl-5- ( 5-chloro-2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate, octyl 3- [3-t-butyl-5- (5-chloro-2H-benzo) Riazol-2-yl) -4-hydroxyphenyl] propionate, methyl 3- [3-tert-butyl-5- (5-chloro-2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate, 3- 2- (2′-hydroxyphenyl) benzotriazole such as [3-t-butyl-5- (5-chloro-2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionic acid and mixtures thereof Can be mentioned.
Two or more different ultraviolet absorbers may be mixed and used.
Particularly preferably, 2-hydroxy-4-octoxybenzophenone, 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2′-hydroxy-3′-t-butyl-5′-methylphenyl) Examples include -5-chlorobenzotriazole, 2,4-di-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate. Such ultraviolet absorbers may be used alone or in admixture of two or more.

  Examples of the light stabilizer include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis ((2,2,6,6-tetramethyl-4-piperidyl) succinate, bis (1, 2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis (N-octoxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (N-benzyloxy-2,2, 6,6-tetramethyl-4-piperidyl) sebacate, bis (N-cyclohexyloxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl) -4-piperidyl) 2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-butyl malonate, bis (1-acryloyl-2,2,6,6-tetramethyl) -4-piperidyl) 2,2-bis (3,5-di-t-butyl-4-hydroxybenzyl) -2-butylmalonate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) Decandioate, 2,2,6,6-tetramethyl-4-piperidyl methacrylate, 4- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionyloxy] -1- [2- (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy) ethyl] -2,2,6,6-tetramethylpiperidine, 2-methyl-2- (2,2,6, 6-tetramethyl-4-piperidyl) amino-N- (2,2,6,6-tetramethyl-4-piperidyl) propionamide, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) 1 , 2, , 4-butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate, 1,2,3,4-butanetetracarboxylic Mixed esterified product of an acid with 1,2,2,6,6-pentamethyl-4-piperidinol and 1-tridecanol,

Mixed esterified product of 1,2,3,4-butanetetrabonic acid and 2,2,6,6-tetramethyl-4-piperidinol and 1-tridecanol, 1,2,3,4-butanetetracarboxylic acid and 1,2,2,6,6-pentamethyl-4-piperidinol and 3,9-bis (2-hydroxy-1,1-dimethylethyl) -2,4,8,10-tetraoxaspiro [5 · 5] Mixed esterified product with undecane, 1,2,3,4-butanetetracarboxylic acid and 2,2,6,6-tetramethyl-4-piperidinol and 3,9-bis (2-hydroxy-1,1-dimethyl) Ethyl) -2,4,8,10-tetraoxaspiro [5 · 5] undecane mixed ester, dimethyl succinate and 1- (2-hydroxyethyl) -4-hydroxy-2,2, , 6-tetramethylpiperidine polycondensate, poly [(6-morpholino-1,3,5-triazine-2,4-diyl) ((2,2,6,6-tetramethyl-4-piperidyl) Imino) hexamethylene ((2,2,6,6-tetramethyl-4-piperidyl) imino)], poly [(6- (1,1,3,3-tetramethylbutyl) imino-1,3,5 -Triazine-2,4-diyl ((2,2,6,6-tetramethyl-4-piperidyl) imino) hexamethylene ((2,2,6,6-tetramethyl-4-piperidyl) imino)), N, N′-bis (2,2,6,6-tetramethyl-4-piperidyl) hexamethylenediamine and 1,2-dibromoethane polycondensate, N, N ′, 4,7-tetrakis [4 , 6-Bis (N-butyl-N- (2,2,6 6-tetramethyl-4-piperidyl) amino) -1,3,5-triazin-2-yl] -4,7-diazadecane-1,10 diamine, N, N ′, 4-tris [4,6-bis (N-butyl-N- (2,2,6,6-tetramethyl-4-piperidyl) amino) -1,3,5-triazin-2-yl] -4,7-diazadecane-1,10-diamine N, N ′, 4,7-tetrakis [4,6-bis (N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidyl) amino) -1,3,5- Triazin-2-yl] -4,7-diazadecane-1,10-diamine, N, N ′, 4-tris [4,6-bis (N-butyl-N- (1,2,2,6,6) -Pentamethyl-4-piperidyl) amino) -1,3,5-triazin-2-yl] -4,7- Hindered amine light stabilizers such as diazadecane-1,10-diamine and mixtures thereof, ethyl α-cyano-β, β-diphenyl acrylate, isooctyl α-cyano-β, β-diphenyl acrylate, methyl α-carbomethoxycinnamate Methyl α-cyano-β-methyl-p-methoxycinnamate, butyl α-cyano-β-methyl-p-methoxycinnamate, methyl α-carbomethoxy-p-methoxycinnamate and N- (β-carbomethoxy Acrylate light stabilizers such as -β-cyanovinyl) -2-methylindoline and mixtures thereof;

Nickel complex of 2,2′-thiobis- [4- (1,1,3,3-tetramethylbutyl) phenol], nickel dibutyldithiocarbamate, nickel salt of monoalkyl ester, nickel complex of ketoxime and mixtures thereof, etc. Nickel-based light stabilizers,

4,4'-dioctyloxy oxanilide, 2,2'-diethoxy oxanilide, 2,2'-dioctyloxy-5,5'-di-t-butylanilide, 2,2'-didodecyloxy -5,5'-di-t-butylanilide, 2-ethoxy-2'-ethyloxanilide, N, N'-bis (3-dimethylaminopropyl) oxamide, 2-ethoxy-5-tert-butyl- Oxamide-based light stabilizers such as 2′-ethoxyanilide, 2-ethoxy-5,4′-di-t-butyl-2′-ethyloxanilide and mixtures thereof;

2,4,6-tris (2-hydroxy-4-octyloxyphenyl) -1,3,5-triazine, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, poly [{ 6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl} {(2,2,6,6-tetramethyl-4-piperidyl) imino} Hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) imino}], dimethyl-1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethyl succinate Piperidine polycondensate, 2- (2-hydroxy-4-octyloxyphenyl) -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [2,4-dihydroxyphenyl -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2,4-bis (2-hydroxy-4-propyloxy) Enyl) -6- (2,4-dimethylphenyl) -1,3,5-triazine, 2- (2-hydroxy-4-octyloxyphenyl) -4,6-bis (4-methylphenyl) -1, 3,5-triazine, 2- (2-hydroxy-4-dodecyloxyphenyl) -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [2-hydroxy-4 -(2-hydroxy-3-butyloxypropoxy) phenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [2-hydroxy-4- (2-hydroxy) 2- (2-hydroxyphenyl) -1,3, such as -3-octyloxypropoxy) phenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine and mixtures thereof - like triazine light stabilizer.
Two or more different light stabilizers may be mixed and used.
Particularly preferably, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5- Triazine-2,4-diyl} {(2,2,6,6-tetramethyl-4-piperidyl) imino} hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) imino}], And dimethyl succinate-1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate.

  Examples of the neutralizing agent include synthetic hydrotalcite, natural hydrotalcite, calcium hydroxide and the like. Examples of the lubricant include paraffin, polyethylene wax, stearic acid, butyl stearate, hydrogenated castor oil, stearyl alcohol, calcium stearate and the like.

Examples of the antistatic agent include cationic antistatic agents such as primary amine salts, tertiary amine salts, quaternary amine salts and pyridine derivatives; sulfated oils, soaps, sulfated ester oils, sulfated amides. Anions such as oils, olefin sulfates, fatty alcohol sulfates, alkyl sulfates, fatty acid ethyl sulfonates, alkyl naphthalene sulfonates, alkyl benzene sulfonates, oxalate sulfonates and phosphate ester salts System antistatic agent; partial fatty acid ester of polyhydric alcohol, ethylene oxide adduct of fatty alcohol, ethylene oxide adduct of fatty acid, ethylene oxide adduct of fatty amino or fatty acid amide, ethylene oxide adduct of alkylphenol, polyvalent Of partial fatty acid esters of alcohol Nonionic antistatic agents such as Chi alkylene oxide adducts, polyethylene glycol; ampholytic antistatic agents such as carboxylic acid derivatives and imidazoline derivatives.

  Examples of the antifogging agent include stearic acid monoglyceride, oleic acid monoglyceride, polyglycerin oleate, sorbitan monolaurate and sorbitan monostearate.

  As the nucleating agent, 1,3,2,4-di-benzylidene-sorbitol, 1,3,2,4-di-di- (p-methyl-benzylidene) sorbitol, 1,3,2,4-di- (P-ethyl-benzylidene) sorbitol, 1,3,2,4-di- (2 ′, 4′-di-methyl-benzylidene) sorbitol, 1,3-p-chloro-benzylidene-2,4-p- Methyl-benzylidene-sorbitol, 1,3,2,4-di- (p-propyl-benzylidene) sorbitol, aluminum-mono-hydroxy-di-pt-butylbenzoate, sodium-bis (4-tert-butylphenyl) ) Phosphate, sodium-2,2′-methylene-bis- (4,6-di-t-butyl-phenyl) phosphate, talc, sodium benzoate, lithium-2,2′- Styrene - bis - (4,6-di -t- butyl phenyl) phosphate, and the like.

  Fillers include magnesium oxide, aluminum oxide, silicon oxide, calcium oxide, titanium oxide, chromium oxide (trivalent), iron oxide, zinc oxide, silica, diatomaceous earth, alumina fiber, antimony oxide, barium ferrite, strontium ferrite, Oxides such as beryllium oxide, pumice, pumice balloon, basic substances or hydroxides such as magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate; magnesium carbonate, calcium carbonate, barium sulfate, ammonium sulfate, calcium sulfite, dolomite, Carbonates such as dawsonite; (sulfur) sulfates such as calcium sulfate, barium sulfate, ammonium sulfate, calcium sulfite, basic magnesium sulfate; sodium silicate, magnesium silicate, aluminum silicate, potassium silicate, calcium silicate, talc Silicates such as clay, mica, asbestos, glass fiber, montmorillolite, glass balloon, glass beads, pentonite; kaolin (ceramic earth), perlite, iron powder, copper powder, lead powder, aluminum powder, molybdenum sulfide, boron fiber And silicon carbide fiber, brass fiber, potassium titanate, lead zirconate titanate, zinc borate, aluminum borate, barium metaborate, calcium borate, sodium borate and the like.

  Flame retardants include pentabromodiphenyl ether, octabromodiphenyl ether, decabromodiphenyl ether, tetrabromobisphenol A, hexabromocyclododecane, triphenyl phosphate, red phosphorus, halogen-containing phosphate esters, aluminum hydroxide, magnesium hydroxide, etc. Can be mentioned. In addition, examples of auxiliary agents that increase the flame retardancy of halogen compounds include antimony trioxide and antimony pentoxide.

  As an additive contained in a polymer stabilizer, antioxidant etc. are preferable, for example, and phenolic antioxidant etc. are especially preferable.

  Examples of the method for producing the polymer stabilizer of the present invention include, for example, a method of mixing the compound (1) and an additive as necessary with a mixer such as a Banbury mixer, for example, a mixture of the above-described methods, for example, And granulation by extrusion granulation, stirring granulation, compression granulation, and the like.

The polymer composition of the present invention contains the polymer stabilizer and a polymer.
Examples of the polymer include a thermoplastic polymer, a thermosetting polymer, a photocurable polymer, and the like, and a thermoplastic polymer is particularly preferable. Hereinafter, the thermoplastic polymer will be described.

  Examples of the thermoplastic polymer include polyolefin [eg, propylene resin, ethylene resin (high density polyethylene (HD-PE), low density polyethylene (LD-PE), linear low density polyethylene (LLDPE), ethylene- Ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer (EVOH), ethylene-methyl methacrylate copolymer, etc.), cyclic polyolefin, methylpentene polymer], polystyrenes [poly (p -Methylstyrene), poly (α-methylstyrene), acrylonitrile-styrene copolymer, special acrylic rubber-acrylonitrile-styrene copolymer, acrylonitrile-chlorinated polyethylene-styrene copolymer, etc.], chlorinated resin (for example, Chlorinated polyethylene , Polychloroprene, chlorinated rubber, polyvinyl chloride, polyvinylidene chloride), methacrylic resin, fluorine resin, polyacetal, grafted polyphenylene ether resin, polyphenylene sulfide resin, polyurethane, polyamide, polyester resin (for example, polyethylene terephthalate, polybutylene terephthalate, Polylactic acid, etc.), polycarbonate, polyacrylate, polysulfone, polyether ether ketone, polyether sulfone, aromatic polyester resin, diallyl phthalate prepolymer, silicone resin, polyisoprene, butadiene polymer and the like. Preferably, for example, ethylene resins, propylene resins, polystyrenes, and vinyl alcohol polymers are preferable, and ethylene vinyl alcohol polymers are particularly preferable.

The production method of the polymer composition of the present invention will be described in the case of producing a thermoplastic polymer. For example, after the polymer stabilizer and the thermoplastic polymer are mixed with a Banbury mixer or the like, a single-screw or multi-screw extruder is used. A method of melt-kneading, for example, a method in which a solution obtained by previously dissolving or suspending the polymer stabilizer in a solvent is fed into a solution after polymerizing a thermoplastic polymer, and then the solvent is removed by a method such as evaporation or the like. Is mentioned.
Examples of other methods for producing the polymer composition include the case where the additives are not all contained in the polymer stabilizer of the present invention. For example, the polymer stabilizer consisting of only the compound (1), the additive, and the heat A method in which a plastic polymer is mixed with a Banbury mixer and then extruded to obtain a pellet-shaped polymer composition, for example, a polymer stabilizer containing some additives, another additive, and a thermoplastic polymer with a Banbury mixer, etc. And a method of obtaining a pellet-shaped polymer composition by extrusion molding.

  The polymer composition thus obtained can be further molded and processed into products such as films, molding materials and pipes.

  The polymer stabilizer in the polymer composition of the present invention is usually such that the compound (1) contained in the polymer stabilizer is 0.0005 to 5 parts by weight, preferably 0.001 to 3 parts by weight with respect to 100 parts by weight of the polymer. Blend in.

  The polymer composition of the present invention is excellent in processing stability. Here, the processing stability is evaluated by the slope of the torque value that rises with time after kneading the polymer composition in a lab plast mill adjusted to 250 ° C. When the inclination is small, it means that decomposition and gel generation are suppressed even when kneaded at a high temperature, the melt viscosity is kept constant, and the processing stability is excellent.

Hereinafter, the present invention will be described in more detail with reference to examples.
Example 1
5H-dibenzo [a, d] cyclohepten-5-one (trade name: dibenzosuberenone, Tokyo Kasei) as a polymer stabilizer with respect to 100 parts by weight of ethylene vinyl alcohol copolymer resin (Nippon Synthetic Chemical Co., Ltd .: Soarnol DT2904RT) 0.3 parts by weight) (Nipponsei Kogyo Co., Ltd.) was mixed and kneaded in a sealed atmosphere at 250 ° C. and a rotation speed of 100 rpm using a Toyo Seiki Laboplast Mill (4C-150) to obtain the polymer composition of the present invention. It was.

(Evaluation of processing stability)
The torque value 1 (N · m) when kneaded for 10 minutes by the Laboplast mill of Example 1 and the torque value 2 (N · m) when kneaded for 40 minutes were measured, and the inclination was determined. . Specifically, [(torque value 2) − (torque value 1)] / (40−10) = 0.006.

(Reference Example 1)
The same procedure as in Example 1 was conducted except that the polymer stabilizer was not mixed. The results are summarized in Table 1.

(Reference Example 2)
The same procedure as in Example 1 was performed except that a phenol-based antioxidant (pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate]) was used as the polymer stabilizer. The results are summarized in Table 1.

  Compared to the case where nothing is added to the polymer as in Reference Example 1 or the case where only the phenolic antioxidant of Reference Example 2 is added, the slope is an order of magnitude smaller when the polymer stabilizer of the present invention is added. . Thus, it can be seen that the polymer stabilizer of the present invention imparts excellent processing stability to a polymer composition containing the same.

  The polymer stabilizer of the present invention imparts excellent processing stability to a polymer composition containing it.

Claims (5)

Formula (1)

(In the formula, X represents an oxygen atom or a sulfur atom.)
A polymer stabilizer comprising a condensed polycyclic hydrocarbon having 13 to 20 carbon atoms and having a structure represented by:
(However, the condensed polycyclic hydrocarbon has aromaticity, and the carbon atom constituting the condensed polycyclic hydrocarbon may be substituted with an oxygen atom, a nitrogen atom, or a sulfur atom. The hydrogen atom contained in the polycyclic hydrocarbon is a halogen atom, a cyano group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkylthio group having 1 to 4 carbon atoms, or a carbon atom having 6 to 12 carbon atoms. It may be substituted with an aryl group.) The condensed polycyclic hydrocarbon has the formula (2)

(In the formula, X represents the same meaning as described above, and R represents a halogen atom, a cyano group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkylthio group having 1 to 4 carbon atoms, or a carbon number. Represents 6-12 aryl groups.)
The polymer stabilizer according to claim 1, which is a compound represented by the formula:   A polymer composition comprising the polymer stabilizer according to claim 1 or 2 and a polymer.   The polymer composition according to claim 3, comprising 0.0005 to 5 parts by weight of a condensed polycyclic hydrocarbon having a structure represented by the formula (1) with respect to 100 parts by weight of the polymer. Formula (1)

(In the formula, X represents an oxygen atom or a sulfur atom.)
A condensed polycyclic hydrocarbon having 13 to 20 carbon atoms having a structure represented by the formula (provided that the condensed polycyclic hydrocarbon has aromaticity, and the carbon atoms constituting the condensed polycyclic hydrocarbon are: The hydrogen atom contained in the condensed polycyclic hydrocarbon may be a halogen atom, a cyano group, an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 1 to 4 carbon atoms. (It may be substituted with an alkoxy group, an alkylthio group having 1 to 4 carbon atoms, or an aryl group having 6 to 12 carbon atoms.)
As a polymer stabilizer.