1368 results about "Residual solvent" patented technology
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Residual Solvent. Definition - What does Residual Solvent mean? In cannabis processing, residual solvent, as the name suggests, is the remaining solvent that is present in cannabis extracts. Residual solvents usually occur when the required processing and solvent-purging methods or steps are not properly utilized.
The invention provides a preparation method of a core-shell structure superfine fibercarrier material for medical dressing. The preparation method is basically characterized by specifically comprising the following steps: mixing and dissolving macromolecular polymers into a solvent to obtain a shell layer solution; selecting at least one of a functional high polymer and a medicine and dissolving the functional high polymer or the medicine into a solvent under the aseptic condition to obtain a core layer solution; and performing coaxial electrostatic spinning, placing into a vacuum drying box, and vacuum-drying to remove the residual solvent to obtain the core-shell structure superfine fibercarrier material for the medical dressing. The core-shell structure superfine fibercarrier material for the medical dressing has excellent water-absorbing property, moisturizing property and air permeability, can provide a wet microenvironment for wound healing, is uniform in pore size distribution, and achieves a bacterium blocking effect. The core layer high polymer or medicine can achieve zero-order release through corrosion or diffusion mechanism, so the influence of the environment on the medicine effect is reduced and unnecessary damage to a human body by the medicine is reduced.
A solvent cast film comprises a polyimide comprising structural units derived from polymerization of a dianhydride component comprising a dianhydride selected from the group consisting of 3,4′-oxydiphthalic dianhydride, 3,3′-oxydiphthalic dianhydride, 4,4′-oxydiphthalic dianhydride, and combinations thereof, with a diamine component wherein the polyimide has a glass transition temperature of at least 190° C.; wherein the film has a coefficient of thermal expansion of less than 60 ppm / ° C., a thickness from 0.1 to 250 micrometers, and less than 5% residual solvent by weight; wherein the polyimide has less than 15 molar % of structural units derived from a member selected from the group consisting of biphenyltetracarboxylic acid, a dianhydride of biphenyltetracarboxylic acid, an ester of biphenyltetracarboxylic acid, and a combination thereof.