Process for preparing 2,2'-methylene-bis(6-(2H-benzotriazol-2-yl)-4-hydrocarbyl phenols)
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United States of America Patent
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Aug 17, 1993
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N/A
app pub date -
Jan 22, 1991
filing date -
Jan 22, 1991
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Expired
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Abstract
A method for preparing 2,2'-methylene-bis-[6-(2H)-benzotriazol-2-yl)-4-hydrocarbyl phenols] is disclosed. According to the process (i) formaldehyde, a dialkylamine and a 4-hydrocarbyl-6-benzotriazolyl phenol as monomer are mixed; (ii) the mixture is heated to a temperature high enough to remove the water produced by the reaction of the mixture; (iii) thereafter an alkaline catalyst is added with heating for several hours; (iv) the phenol compound precipitates when the reaction mixture is neutralized and solvent for the salt product of the neutralization reaction is added in an amount sufficient to permit stirring. The solid product produced is 2,2'-methylene-bis-[6-(2H-benzotriazol-2-yl)-4-hydrocarbyl phenol] having the formula I: ##STR1## in which each R group is an alkyl group of one to twelve carbons or a cycloalkyl group of five to eight carbons and X is chloro or hydrogen.
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