- Synthesis method of thiodiethylene bis [3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate]
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The invention relates to a synthesis method of thiodiethylene bis [3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate]. The method comprises the following steps: enabling 2, 6-di-tert-butylphenol to react with acrylate, and continuing to react with 2-chloroethanol, so as to obtain an intermediate 3-(3, 5-di-tert-butyl-4-tetrahydroxyphenyl) propionic acid 2-chloroethyl ester; and reacting with sodium sulfide in the presence of quaternary ammonium salt to obtain a target product. The synthesis method disclosed by the invention has the advantages of simple process, high product yield and high purity, and is particularly suitable for being applied to industrial production.
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Paragraph 0045; 0047; 0048; 0050; 0051; 0053; 0054-0055
(2022/03/27)
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- Preparation method of thioether sterically hindered phenol antioxidant
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The invention discloses a preparation method of a thioether sterically hindered phenol antioxidant, which comprises the following steps: a first stage: carrying out transesterification on 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) methyl propionate and thiodiglycol under the action of a solid base catalyst; a second stage: removing by-product methanol under reduced pressure; and a third stage, alternately removing unreacted raw materials by nitrogen purging and pressure reduction, cooling, filtering, and collecting the solid base catalyst to obtain the target product. The synthesis process is simple, solvent crystallization purification, drying and other operations do not need to be conducted on a reaction mixture, and the product can be obtained through direct cooling; the production period is short, the later solvent waste liquid treatment is reduced, and the production cost is obviously reduced.
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Paragraph 0059-0079
(2020/08/18)
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- Organothioethyl alcohol segmers as antidegradant synergists
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This invention is concerned with the stabilization of organic materials subject to oxidative degradation. The synergists of this invention possess organothioethyl alcohol segmers or moieties which enhance the antioxidative activity of phenolic and amine stabilizers. The invention is also concerned with compounds that contain an organothioethyl alcohol moiety and their use in oxidizable materials in combination with polymerizable and/or conventional antidegradants.
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- Polymerizable thioester synergists
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There are disclosed polymerizable thioester synergists which have utility in enhancing the antioxidative activity of phenolic and amine stabilizers. The invention is also concerned with the thioesters themselves, their use in oxidizable organics, their combination with polymerizable and/or conventional antioxidants, and with polymers which contain these thioesters as physical admixtures or segmeric units of the polymer.
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- Compositions containing antimicorbial agents in combination with stabilizers
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Composition of an antimicrobial agent and an antioxidant having improved antimicrobial activity compared to the antimicrobial agent alone. The preferred environment of the invention is a composition of a thermoplastic resin, an antioxidant, and an antimicrobial agent, the latter two being compatible with the resin. The resin composition can contain other usual additives, and can be melt processed at an elevated temperature to form articles such as films or fibers having improved antimicrobial activity. A method for improving the efficacy of an antimicrobial agent by combining it with an antioxidant is disclosed. A method for melt-processing a resin composition containing an antimicrobial material is also disclosed, wherein the resin composition includes an antioxidant. The inventors have thus discovered and solved the problem of oxidation of an antimicrobial composition, particularly a resin composition containing an antimicrobial agent, which arises when the composition is processed at elevated temperatures, as are typically encountered when forming a fiber or film of the composition.
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- Synergistic antioxidant mixtures
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Compounds prepared by reacting maleic anhydride, maleic acid or their esters with thiols; which exhibit a synergistic effect when combined with a phenolic antioxidant in the stabilization of organic materials such as natural and synthetic polymers, rubbers, lubricants and oil, etc. are disclosed.
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- Synergistic antioxidant mixtures
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Compounds of the formula: STR1 wherein R, R' and R2 are alkyl radicals having 1 to 20 carbon atoms, phenyl radicals which may be substituted by 1 or 2 alkyl groups having 1 to 8 carbon atoms, aralkyl radicals having 7 to 12 carbon atoms, or cycloalkyl radicals having 5 to 12 carbon atoms; and wherein R3 is hydrogen or an alkyl radical having from 1 to 4 carbon atoms. These compounds have utility as synergistic stabilizers with phenolic type antioxidants for the stabilization of organic materials such as natural and synthetic polymers, rubbers, lubricants and oils, etc.
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- Synergistic antioxidant mixtures
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Compounds of the formula: STR1 wherein R is selected from (1) alkyl radicals having 6 to 20 carbon atoms; (2) phenyl radicals which may be substituted by 1 or 2 alkyl groups having 1 to 8 carbon atoms; or (3) aralkyl radicals having 7 to 12 carbon atoms; and wherein R1 is selected from (1) alkylene radicals having 2 to 6 carbon atoms; (2) cycloalkylene radicals having 5 to 12 carbon atoms; (3) alkylcycloalkylene radicals of the formula --R3 --R2 (R4)n, wherein R2 is a cycloalkylene radical having 5 to 12 carbon and R3 and R4 are alkylene radicals having 1 to 6 carbon atoms, and n equals 1 or 0; (4) or a group of the formula --R5 --YR6, wherein R5 and R6 are alkylene radicals having 2 to 6 carbon atoms and Y is oxygen, sulfur, or a 1,4-phenylene radical. These compounds have utility as synergistic stabilizers with phenolic type antioxidants in the stabilization of organic materials such as natural and synthetic polymers, rubbers, lubricants and oils, etc.
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