- Phenol composition and thermoplastic polymer composition comprising the composition
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Recently, further improved process stability for thermoplastic polymer compositions has been demanded. Phenol compositions are provided comprising a compound represented by the formula (1): in the formula (1), R1 and R2 are each ind
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- GRANULAR STABILIZER FOR POLYMER AND PRODUCTION PROCESS THEREOF
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The present invention provides a granular stabilizer for a polymer which is low-dusting and thus is easy to be handled. The present invention relates to a granular stabilizer for a polymer, comprising a compound shown by the formula (1): wherein R1/
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- Production of bisphenol monoester
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A bisphenol monoester represented by the formula (I): STR1 wherein R1 is hydrogen or alkyl, R2 and R3 are each alkyl, and R4 is alkyl, alkenyl or phenyl, is produced by continuous two step reactions in which an aldehyde R1 -CHO and 2,4-dialkylphenol are subjected to a condensation reaction in a C6 -C10 aliphatic or C6 -C12 aromatic hydrocarbon solvent, and then a resulting bisphenol compound dissolved in the solvent is subjected to an esterification with a carboxylic acid R4 --COOH or its derivative. Prior to the esterification, the organic layer containing the bisphenol compound is subjected to a dehydration treatment, thereby enabling the two steps to proceed continuously without isolating the intermediate bisphenol compound. A purification process for the bisphenol monoester of the formula (I) is also disclosed in which the monoester is purified from a mixed solvent comprising a C6 -C12 aromatic hydrocarbon solvent and a C1 -C8 alcohol or C2 -C3 aliphatic nitrile solvent.
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- Production of bisphenol derivatives
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Bisphenol derivatives of the formula (I), STR1 are produced by reacting a carboxylic acid, RCOOH (II), with a bisphenol of the formula (III), STR2 adding a halogenating agent in the presence of a dehydrohalogenating agent. The product bisphenol derivatives are useful as antioxidants.
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- Phenolic antioxidants
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Two antioxidants functioning by different mechanisms are combined chemically into one molecule, allowing optimization of their antioxidant properties.
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- Esters of polyphenolic compounds as built-in antioxidants
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This invention concerns a method for the preparation of polyphenolic esters for use as built-in antioxidants.
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