Polymeric antioxidants

US7595074B2 · kind B2 · utility

Assignees

• University of Massachusetts Lowell · US
• The United States of America as represented by the Secretary of the Army · US

Inventors

• Ashok L. Cholli · Chelmsford, US
• Vijayendra Kumar · Lowell, US
• Ashish Dhawan · Saint Paul, US
• Jayant Kumar · Westford, US
• Virinder Singh Parmar · Lowell, US
• Lynne A. Samuelson · Marlborough, US
• Ferdinando Bruno · Andover, US

Key dates

• Filing date: Jan 21, 2004
• Grant date: Sep 29, 2009
• Expiry date: Sep 9, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10M2209/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method of preparing a phenolic polymer comprising: a) protecting at least one hydroxyl group of a substituted or unsubstituted phenol represented by Structural Formula (XXIX), wherein: R11, R12, R13, R14 and R15 are independently —H, —OH, —NH, —SH, a substituted or unsubstituted alkyl or aryl group, a substituted or unsubstituted alkoxycarbonyl or aryloxycarbonyl group, a substituted or unsubstituted alkoxy group or a saturated or unsaturated carboxylic acid group; or R11, R12, R13, R14 or R15, in conjunction with an adjacent R11, R12, R13, R14 or R15, forms a substituted or unsubstituted alkylene dioxy group; provided that at least one of R11, R12, R13, R14 or R15 is a tert-butyl group 1-ethenyl-2-carboxylic acid or ester thereof, a substituted or unsubstituted alkylene dioxy group or a substituted or unsubstituted n-alkoxycarbonyl group, at least one of R11, R12, R13, R14 or R15 is a hydroxyl group, and at least one of R11, R12, R13, R14 and R15 is —H; with a protecting group, wherein thereby obtaining one or more protected hydroxyl groups; and b) polymerizing the substituted or unsubstituted phenol, thereby obtaining the phenolic polymer.