Esterified polysaccharide products and β-lactone ring opened ketene dimer products containing the compositions, and process of making the same
AssigneeHercules Incorporated
InventorsHuai N. Cheng, Qu Ming Gu
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Abstract
Esterified polysaccharides and the process of making such products are disclosed. The process can be enzymatic where an enzyme is used as a catalyst for the reaction. The process can also be chemical where no enzyme is used. Novel Products are obtained through lipase-catalyzed β-lactone ring opening alcoholysis of ketene dimers and the process of making such compositions containing products.
Claims32
A product comprising a modified polysaccharide product having the general formula:
- [R—O]—CO—CH(R1)—CO—CH2—R1
- wherein R is a polysaccharide, and R1 is a linear or a branched aliphatic or olefinic chain having 2 to 20 carbons;
- in combination with an enzyme which can catalyze the formation of said modified polysaccharide.
An esterified polysaccharide, which is an enzymatic reaction product between a polysaccharide and a ketene dimer, said product having the general formula:
- [R—O]—CO—CH(R1)—CO—CH2—R1
- wherein R is a polysaccharide or polysaccharide ether, and R1 is a linear or a branched aliphatic or olefinic chain having 2 to 20 carbons;
- wherein said polysaccharide ether has a molar substitution of about 0 to 4.0;
- wherein said ketene dimer is an aliphatyl or olefinyl ketene dimer;
- and
- wherein said enzyme, is a lipase obtained from Pseudomonas sp. or from Pseudomonas fluorescens, in deactivated form;
- said product having a viscosity about 20 to 300 times more than that of said polysaccharide before reaction.
Dependencies are inferred from the claim text.