Method for producing cellulose derivative, and cellulose derivative
AssigneeNEC Corporation
InventorsShukichi Tanaka, Kiyohiko Toyama, Masatoshi Iji
Life of this patent
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Abstract
A method for producing a cellulose derivative, including reacting a mixed acid anhydride having two particular types of acyl groups with cellulose in the presence of a base catalyst in an organic solvent having an electron pair-donating property to form a cellulose derivative with the two types of acyl groups derived from the mixed acid anhydride, the acyl groups being introduced at hydroxy groups in the cellulose.
Claims14
A method for producing a cellulose derivative, comprising reacting a mixed acid anhydride represented by formula (A) with cellulose in the presence of a base catalyst in an organic solvent having an electron pair-donating property to form a cellulose derivative with a first acyl group (—CORSH) and a second acyl group (—CORLO) introduced at hydroxy groups in the cellulose:
- wherein, in formula (A), RSH represents an organic group having 1 to 3 carbon atom(s);
- and RLO represents an organic group having an electron-withdrawing property, and
- wherein, in formula (A), RLO is a group comprising a first organic group bonded to the carbonyl carbon in the mixed acid anhydride, and a second organic group linked to the first organic group through an ether group (—O—),
- the ether group is bonded to a carbon atom in the first organic group, and the carbon atom is bonded to the carbonyl carbon in the mixed acid anhydride,
- the first organic group is a methylene group, and
- the second organic group is a hydrocarbon group having 1 to 24 carbon atom(s).
A method for producing a cellulose derivative, comprising reacting a mixed acid anhydride represented by formula (A) with cellulose in the presence of a base catalyst in an organic solvent having an electron pair-donating property to form a cellulose derivative with a first acyl group (—CORSH) and a second acyl group (—CORLO) introduced at hydroxy groups in the cellulose:
- wherein, in formula (A), RSH represents an organic group having 1 to 3 carbon atom(s);
- and RLO represents an organic group having an electron-withdrawing property, and
- wherein, in formula (A), RLO is a hydrogenated cardanoxymethyl group represented by —CH2—O—C6H4—(CH2)14CH3 or —CH2—O—C6H10—(CH2)14CH3.
Dependencies are inferred from the claim text.