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US 2003/0120089 A1Published application
Anhydride stabilization
AssigneeHuntsman Petrochemical Corporation
InventorHenry C. Brown
Life of this patent
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Abstract
Disclosed herein are compositions comprising organic anhydrides having a reduced tendency to discolor with time, even when held at elevated temperatures for extended times. The compositions are produced by mixing at least one acid halide and various derivatives of hydroxy carboxylic acids with an anhydride to form a homogenous solution. Also disclosed is a process for preparing the compositions.
Claims34
1) An organic acid anhydride product having a high degree of resistance to discoloration that is made by combining components comprising:
- a) an organic acid anhydride;
- b) an acid halide of a carboxylic acid;
- and
- c) at least one derivative of a hydroxy carboxylic acid in an amount less than 0.10% by weight based on the total weight of the anhydride product.
1 more element
Dependencies are inferred from the claim text.