摘要:
A process for producing an esterified cellulose ether comprises the step of reacting a cellulose ether with an aliphatic monocarboxylic acid anhydride and/or a dicarboxylic acid anhydride and with a depolymerizing agent, wherein the cellulose ether has an initial viscosity of at least 500 mPa·s, measured as a 2 weight-% solution in water at 20° C., and the reaction of the cellulose ether with the aliphatic monocarboxylic acid anhydride and/or the dicarboxylic acid anhydride and with the depolymerizing agent is conducted simultaneously or in sequence in one reaction device.
摘要:
The present invention relates to a cellulose composite that makes separation and aggregation less likely to occur, and, more specifically, relates to a cellulose composite comprising cellulose and one or more types of water-soluble carboxymethyl cellulose wherein tan δ of an aqueous dispersion obtained by dispersing 1 mass% of the cellulose composite in ion-exchanged water is 0.6 or lower.
摘要:
A process for producing an esterified cellulose ether comprises the step of reacting a cellulose ether with an aliphatic monocarboxylic acid anhydride and/or a dicarboxylic acid anhydride and with a depolymerizing agent, wherein the cellulose ether has an initial viscosity of at least 500 mPa·s, measured as a 2 weight-% solution in water at 20° C., and the reaction of the cellulose ether with the aliphatic monocarboxylic acid anhydride and/or the dicarboxylic acid anhydride and with the depolymerizing agent is conducted simultaneously or in sequence in one reaction device.
摘要:
Esterified cellulose ethers which have i) as ester groups aliphatic monovalent acyl groups or groups of the formula - C(O) - R - COOA or a combination of aliphatic monovalent acyl groups and groups of the formula -C(O) - R - COOA, wherein R is a divalent aliphatic or aromatic hydrocarbon group and A is hydrogen or a cation, and ii) a content of not more than 0.85 weight percent acetone-insoluble esterified cellulose ether particles, when the esterified cellulose ether is present in a mixture of 12.5 weight parts of esterified cellulose ether and 87.5 weight parts of acetone at 21 °C, the weight percent acetone-insoluble esterified cellulose ether particles being based on the total weight of the esterified cellulose ether, wherein iii) not more than 14 percent of the acetone-insoluble esterified cellulose ether particles have a particle size of more than 90 micrometers.
摘要:
A glucan product characterized by being in gel form at 25°C and at a pH between 4 and 8 and comprising a beta glucan derived from yeast at a concentration of 0.1 to 6% in an aqueous solution and 0.2 to 3% carboxymethyl cellulose, uses thereof and physical supports comprising the same.
摘要:
A cellulose ester composition is provided comprising at least one cellulose ester and at least one additive selected from the group consisting of a compatibilizer, and a plasticizer. Processes for producing the cellulose ester composition are also provided. In another embodiment, a cellulose ester/elastomer composition is provided comprising at least one elastomer, at least one cellulose ester; and at least one additive; wherein the additive is at least one selected from the group consisting of a compatibilizer and a plasticizer. Processes for producing the cellulose ester/elastomer composition is also provided as well as articles comprising the cellulose ester/elastomer composition.
摘要:
Disclosed are polymers of hydroxypropyl methyl cellulose acetate succinate (HPMCAS) with unique degrees of substitution of hydroxypropoxy, methoxy, acetyl, and succinoyl groups. When used in making compositions comprising a low- solubility active agent and such polymers, the polymers provide increased aqueous concentrations and/or improved physical stability of the active agent.
摘要:
A cellulose derivative, contains A) a hydrocarbon group; B) a group containing an acyl group: -CO-R B and an ethyleneoxy group: -C 2 H 4 -O- (R B represents a hydrocarbon group); and C) an acyl group: -CO-R C (R C represents a hydrocarbon group).
摘要翻译:纤维素衍生物,包含A)的烃基; B)的基团含酰基的:-CO-R B和在乙烯氧基:-C 2 H 4 -O-(R B darstellt的烃基); 和C)酰基基团:-CO-R C(R C darstellt的烃基)。