摘要:
Disclosed are polymers of hydroxypropyl methyl cellulose acetate succinate (HPMCAS) and hydroxypropyl methyl cellulose acetate (HPMCA) with unique degrees of substitution of hydroxypropoxy, methoxy, acetyl, and succinoyl groups. When used in making compositions comprising a low-solubility drug and such polymers, the polymers provide enhanced aqueous concentrations and/or improved physical stability.
摘要:
A cellulose derivative, contains A) a hydrocarbon group; B) a group containing an acyl group: —CO—RB and an ethyleneoxy group: —C2H4—O— (RB represents a hydrocarbon group); and C) an acyl group: —CO—RC (RC represents a hydrocarbon group). A method for preparing the cellulose derivative, a resin composition containing the cellulose derivative, a case for an electric and electronic device and a method for preparing a molded body are also provided.
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:
Cellulose mixed esters are disclosed having low molecular weights and low degrees of polymerization. These new cellulose mixed esters include cellulose acetate propionate and cellulose acetate butyrate. The esters exhibit solubility in a wide range of organic solvents with minimal viscosity increase, are compatible with a wide variety of resins, and are useful in coatings and inks compositions as binder resins and rheology modifiers.
摘要:
A cellulose derivative and a resin composition having good thermoplasticity, strength, and elongation at break and therefore suited to molding processing are provided. The cellulose derivative is derived by replacing at least part of the hydrogen atoms of the hydroxyl groups of cellulose with a hydrocarbon group and an aliphatic or aromatic oxycarbonyl group.
摘要:
Carboxyalkylcellulose esters are disclosed having relatively low degrees of polymerization. These new carboxyalkylcellulose esters include carboxymethylcellulose acetate, carboxymethylcellulose acetate propionate, and carboxymethylcellulose acetate butyrate. The inventive esters exhibit solubility in a range of organic solvents, and are useful in coatings and ink compositions as binder resins and rheology modifiers.
摘要:
Compositions containing an aqueous dispersion of selected polymers and selected polyaldehydes as crosslinking agents are described.Adhesives having very high resistance to boiling water can be produced from these formulations.
摘要:
The present invention relates to a preparation method of solvent-free water-dispersible hydroxypropyl methyl cellulose phthalate nanoparticle, and more particularly, to a preparation method of solvent-free water-dispersible hydroxypropyl methyl cellulose phthalate nanoparticle, which is environment-friendly and advantageous in disintegration and dissolution when used as an enteric coating material, which is prepared by obtaining suitable hydroxypropyl methyl cellulose phthalate (HPMCP) particle through aqueous emulsification process and regulating content of remaining electrolyte through ion exchange process.
摘要:
Cellulose mixed esters are disclosed having low molecular weights and low degrees of polymerization. These new cellulose mixed esters include cellulose acetate propionate and cellulose acetate butyrate. The esters exhibit solubility in a wide range of organic solvents with minimal viscosity increase, are compatible with a wide variety of resins, and are useful in coatings and inks compositions as binder resins and rheology modifiers.
摘要:
Uniform, thermoplastic, normally solid blends containing cyclic ester polymers containing recurring units of the formula
WHEREIN EACH R, individually, is selected from the class consisting of hydrogen, alkyl, halo, and alkoxy; A is the oxy group; x is an integer from 1 to 4; y is an integer from 1 to 4; z is an integer of zero or one; with the provisos that (a) the sum of x + y + z is at least 4 and not greater than 7, and (b) the total number of R variables which are substituents other than hydrogen does not exceed 3, with or without recurring units of the formula
wherein each R'' is selected from the class consisting of, individually, hydrogen, alkyl, cyclcoalkyl, aryl, and chloroalkyl, and, together with the ethylene moiety of the oxyethylene chain of Unit II, a saturated cycloaliphatic hydrocarbon ring having from 4 to 8 carbon atoms; and thermoplastic normally solid polymer which can be a condensation polymer, and/or an addition polymer of olefinically unsaturated monomers having no more than one hydrogen bonded to each carbon of each olefinically unsaturated group thereof, including such polymers as cellulose derivatives, nylons, polyester polymers, polyoxyalkylenes, polycarbonates, poly(fluorocarbons), coumaroneindene resins, maleic acid or anhydride addition polymers and copolymers, stilbene addition polymers and copolymers, chlorinated polyethers, aromatic poly(hydroxy ether) polymers, polysufones, polypeptides, etc. These novel blends are useful in the production of fibers, films, coatings, adhesives, wire and cable coatings, molding materials, extrusion materials, or shaped articles, having one or more unique properties, such as, dyeability, improved stress crack resistance, improved optical properties, e.g., improved hiding power, low haze, high gloss and/or high light transmission, improved plasticization, improved toughness, improved melt processability, improved impact resistance, and/or improved ability to disperse additives, such as, fillers coloring agents, antioxidants, extenders, etc.