Patent ID: 7273951

Claim:
A polyhydroxy phenol of structural formula: wherein: R 1 =a hydrogen; a straight or branched (C 1 -C 4 ) aliphatic alkyl group or an aromatic group, optionally respectively substituted by a hydroxyl group, a carboxylic acid group, an amino group or a straight or branched (C 1 -C 4 ) aliphatic alkyl group; R 2 =a hydrogen; a straight or branched (C 1 -C 4 ) aliphatic alkyl group; and R 3 =a straight or branched (C 1 -C 4 ) aliphatic alkyl group, optionally substituted by one or more carboxylic acid group, or a straight or branched (C 1 -C 4 ) aliphatic alkyl amide group; or a (C 3 -C 8 ) cycloalkyl group, optionally substituted by a straight or branched (C 1 -C 4 ) aliphatic alkyl group or one or more carboxylic acid group.