Cellulose derivative and method for production thereof
AssigneeTeijin Limited
InventorsMasaya Ito, Hiroaki Kaneko, Yukako Fukuhira, Nobuyuki Endo
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Abstract
The invention provides a cellulose derivative having a repeating unit of the formula below, a composition including the cellulose derivative and a phospholipid, a method for production thereof, and an adhesion barrier including the cellulose derivative or the composition. In the formula, R1, R2, and R3 are —H, —CH2—COOH, —CH2—COOX, or —CH2CO-phosphatidylethanolamine, and X is an alkali metal or an alkali earth metal. The degree of substitution of —CH2—COOH and —CH2—COOX is 0.3 to 2.0 in total, and the degree of substitution of —CH2CO-phosphatidylethanolamine is 0.001 to 0.05.
Claims26
A cellulose derivative having a repeating unit of the formula
- where R1, R2, and R3 are independently selected from the group consisting of (a), (b), (c), and (d) below,
- —H (a)
- —CH2—COOH (b)
- —CH2—COOX (c)
- X in (c) being an alkali metal or an alkali earth metal,
- R4 and R5 in (d) being independently an alkenyl group having 9 to 19 carbon atoms,
- a degree of substitution of (b) and (c) being 0.3 to 2.0 in total, and
- a degree of substitution of (d) being 0.001 to 0.05,
- wherein the repeating unit can vary depending on its substituents,
- wherein R1, R2, and R3 are not all hydrogen atoms in at least some repeating units.
Dependencies are inferred from the claim text.