Process for preparing 2,2'-methylene-bis(6-(2H-benzotriazol-2-yl)-4-hydrocarbyl phenols)
US5237071A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Jan 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D249/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for preparing 2,2'-methylene-bis-[6-(2H)-benzotriazol-2-yl)-4-hydrocarbyl phenols] is disclosed. According to the process PA0 (i) formaldehyde, a dialkylamine and a 4-hydrocarbyl-6-benzotriazolyl phenol as monomer are mixed; PA0 (ii) the mixture is heated to a temperature high enough to remove the water produced by the reaction of the mixture; PA0 (iii) thereafter an alkaline catalyst is added with heating for several hours; PA0 (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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.