The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 13, 2014
Filed:
May. 15, 2008
Hanamanthsa Shankarsa Bevinakatti, Ingelby Barwick, GB;
Alan Geoffrey Waite, Darlington, GB;
Jackie Frank, Redcar, GB;
Hanamanthsa Shankarsa Bevinakatti, Ingelby Barwick, GB;
Alan Geoffrey Waite, Darlington, GB;
Jackie Frank, Redcar, GB;
Croda International PLC, Goole, North Humberside, GB;
Abstract
Polyglycerol carboxylic acid esters are made by reaction of a, typically Cto C, particularly Cto C, carboxylic acid with glycerol carbonate, particularly with base catalyst, and desirably at temperatures from 170° C. to 250° C. Other carbonates e.g. cyclic diol carbonates such as ethylene or propylene carbonates, may be used in combination with the glycerol carbonate to make novel mixed polymeric esters. The molar ratio of carboxylic acid group to glycerol carbonate is typically from 2 to 30, but can be up to 100. The base catalyst is desirably alkali metal hydroxide, carbonate or alkoxide. The reaction is desirably carried out in an inert atmosphere, and reducing agent such as phosphorous acid, hypophosphorous acid or borohydride and/or activated carbon, may be included to improve product color.