Patent ID: 6326518
Filing Date: 2001-12-04
Classification: C08K

Abstract:
A method for the preparation of a heat stabilizer for halogen-containing polymers, said method comprising condensing a para-substituted phenol with formaldehyde in the presence of an alkali metal hydroxide in aqueous solution at a temperature of up to about 60.degree. C., wherein the ratio of the phenol to formaldehyde is from 1:1 to about 1:1.05 on an equivalent weight basis, and the molar ratio of the phenol to alkali metal hydroxide is about 1:1, quenching the condensation by cooling the reaction mixture below 20.degree. C., neutralizing the mixture, isolating the resultant condensate, and further condensing the resultant condensate without further purification with a mercaptan-containing compound selected from the group consisting of alkyl mercaptans, mercapto esters, mercapto alcohols, and mercapto acids at from about 40.degree. to about 120.degree. C. in the presence of an acid catalyst.