Disclosed is an adduct between a Lewis acid, preferably aluminum trichloride, iron trichloride, or zinc dichloride, and a hydrosilane;—a method for preparing same; and a method for for reducing, particularly, an aldehyde, a ketone, an α,β-unsaturated ketone, an imine, or an α,β-unsaturated imine.

Disclosed is an adduct between a Lewis acid, preferably aluminum trichloride, iron trichloride, or zinc dichloride, and a hydrosilane;—a method for preparing same; and a method for for reducing, particularly, an aldehyde, a ketone, an α,β-unsaturated ketone, an imine, or an α,β-unsaturated imine.

A method of improving rheological properties of a divalent brine based downhole treatment fluid at an elevated temperature comprises adding to the divalent brine based downhole treatment fluid a rheological modifier, which comprises a carboxylic acid ester, or a phosphate ester blended with an ethoxylated glycol, or a combination comprising at least one of the foregoing in an amount effective to improve the rheological properties of the divalent brine based downhole treatment fluid at a temperature of greater than about 200° F. The divalent brine based downhole treatment fluid comprises calcium bromide, calcium chloride, zinc bromide, zinc chloride, or a combination comprising at least one of the foregoing.

The invention molecularly equips polyester or polyolefin molding compositions in situ with zinc ions before extrusion, enabling direct processing of the molding compositions from the melt even at high temperatures and ensuring a long-term antibacterial action. The inventive molding compositions include at least one polyester polymer or polyolefin polymer and at least one zinc salt-organoligand complex.

The invention molecularly equips polyester or polyolefin molding compositions in situ with zinc ions before extrusion, enabling direct processing of the molding compositions from the melt even at high temperatures and ensuring a long-term antibacterial action. The inventive molding compositions include at least one polyester polymer or polyolefin polymer and at least one zinc salt-organoligand complex.

The present invention relates to a method for preparing basic zinc chloride, comprising the following steps: A: preparing raw materials: preparing zinc chloride solution, ammonia water and an induction system; B: performing synthesis: adding the zinc chloride solution and the ammonia water into the induction system in a parallel flow manner, and controlling the temperature to be 60.0-90.0° C.; after the feeding is finished, continuing to react for 20.0-40.0 minutes; and C: performing filtration, washing and drying: after filtering and washing the synthesized basic zinc chloride, drying the basic zinc chloride for 4.0-8.0 hours at 80-105° C. to obtain the basic zinc chloride product. Compared with the prior art, the method for preparing basic zinc chloride has such advantages as simple process, low impurity content, easy-to-control product quality, and suitability for industrialization.

The present invention relates to a method for preparing basic zinc chloride, comprising the following steps: A: preparing raw materials: preparing zinc chloride solution, ammonia water and an induction system; B: performing synthesis: adding the zinc chloride solution and the ammonia water into the induction system in a parallel flow manner, and controlling the temperature to be 60.0-90.0° C.; after the feeding is finished, continuing to react for 20.0-40.0 minutes; and C: performing filtration, washing and drying: after filtering and washing the synthesized basic zinc chloride, drying the basic zinc chloride for 4.0-8.0 hours at 80-105° C. to obtain the basic zinc chloride product. Compared with the prior art, the method for preparing basic zinc chloride has such advantages as simple process, low impurity content, easy-to-control product quality, and suitability for industrialization.

Methods for the formulation of biodegradable microparticles for delivery of protein drugs, such as botulinum toxin, have been developed. The methods include the steps of precipitating and washing proteins with organic solvent to remove water prior to dispersing in polymer-dissolved organic solvent to prevent exposure to water/solvent interfaces and maintain bioactivity of the protein drugs and fabrication of microparticles by either template or emulsion method. Biodegradable microparticles, formed of one or more biodegradable polymers having entrapped in the polymer one or more protein agents, such as botulinum toxin, are also provided. Precipitated botulinum toxin and botulinum toxin-loaded microparticles can also be formulated into thermogels or crosslinked hydrogels. The stability of the protein within these microparticles, as well as the controlled release of the entrapped agents, provides for sustained efficacy of the agents.

Methods for the formulation of biodegradable microparticles for delivery of protein drugs, such as botulinum toxin, have been developed. The methods include the steps of precipitating and washing proteins with organic solvent to remove water prior to dispersing in polymer-dissolved organic solvent to prevent exposure to water/solvent interfaces and maintain bioactivity of the protein drugs and fabrication of microparticles by either template or emulsion method. Biodegradable microparticles, formed of one or more biodegradable polymers having entrapped in the polymer one or more protein agents, such as botulinum toxin, are also provided. Precipitated botulinum toxin and botulinum toxin-loaded microparticles can also be formulated into thermogels or crosslinked hydrogels. The stability of the protein within these microparticles, as well as the controlled release of the entrapped agents, provides for sustained efficacy of the agents.

A basic zinc chloride particulate matter and a preparation method therefor. The basic zinc chloride particulate matter mainly consists of basic zinc chloride particles. In the basic zinc chloride particulate matter, D.sub.10>100 μm, and D.sub.95>450 μm. The basic zinc chloride particles do not contain adhesives. The basic zinc chloride particles contained in the basic zinc chloride particulate matter are approximately spherical, and the basic zinc chloride particles with the particle diameter>500 μm in the basic zinc chloride particulate matter accounts for 1% or less of the total mass of the basic zinc chloride particulate matter.