63results about How to "Easily degradable" patented technology

This invention relates to biocompatible, biodegradable thermoplastic polyurethane or polyurethane/ureas comprising isocyanate, polyol and a conventional chain extender and/or a chain extender having a hydrolysable linking group and their use in tissue engineering and repair applications, particularly as stents and stent coating.

The specification discloses a polymer blend especially well-suited for coating paperboard substrates used in food packaging, particularly acidic or acid-generating foods such as fruit and vegetable juices. The blend contains an acid-activatable oxygen scavenger dispersed in a film-forming synthetic polymer such as an EVOH copolymer. When placed as a film or layer on the side of the substrate inside the container in contact with the food the blend is effective to reduce the oxygen in the container over time to a very low concentration, replacing the same with carbon dioxide, for an excellent preservative effect.

Disclosed herein are anti-microbial wash compositions and methods for using such compositions in controlling microbe growth on a meat food product (e.g., a slaughtered meat carcass) by applying or contacting the anti-microbial wash composition with a surface of the food product to kill microbes (e.g., bacteria) on a surface of the food product. The anti-microbial wash compositions include a ceragenin compound dispersed in a fluid carrier. The ceragenin compound includes a sterol backbone and a number of cationic groups attached to the sterol backbone.

The invention relates to the separation of lanthanides and actinides by nanofiltration complexation. The object of the invention is to satisfy the existing need for a simple, efficient and economical technique for separating lanthanides and actinides. This object is achieved by a process consisting of using ligands of the polyamino acid type, such as EDTA or DTPA, for complexing lanthanides and/or actinides before separating them by nanofiltration. The invention further relates to novel polyamino acid ligands incorporating ligand structures additional to EDTA and DTPA. Application to the production of rare earths or nuclear waste processing, especially to recycling operations carried out on spent nuclear fuels is also discussed.

A subterranean fracturing fluid, which is relatively harmless to both the environment and subterranean formations includes an amphoteric surfactant, specifically a betaine surfactant and an organic electrolyte or an alcohol in an aqueous medium. Depending upon the proportions of the ingredients, the fluid can be foamed.

The invention discloses an amphoteric-cellulose-based composite material and application thereof. Quaternary ammonium-sulfonic acid cellulose serves as a carrier, grapheme oxide and chitosan are loaded in a blending manner, binding force among the three is utilized, and a quaternary ammonium-sulfonic acid cellulose/ grapheme oxide/chitosan composite porous material is obtained through freeze drying. The quaternary ammonium-sulfonic acid cellulose/ grapheme oxide/chitosan composite porous material comprises, by weight, 5-8 parts of quaternary ammonium-sulfonic acid cellulose, 0.5-3 parts of grapheme oxide and 0.5-3 parts of chitosan, is safe, non-poisonous and good in biocompatibility and degradability, has an orderly three-dimensional porous structure, good mechanical strength and efficient adsorption capability, can be used for water absorption and oil removal and processing of heavy metal ion waste water and organic waste water, and hopefully serves as a filtering material such as an air purification material and a medical adsorption material for use.

Biocompatible crosslinked polymers, and methods for their preparation and use, are disclosed in which the biocompatible crosslinked polymers are formed from water soluble precursors having electrophilic and nucleophilic functional groups capable of reacting and crosslinking in situ. Methods for making the resulting biocompatible crosslinked polymers biodegradable, or not, are provided, as are methods for controlling the rate of degradation. The crosslinking reactions may be carried out in situ on organs or tissues or outside the body. Applications for such biocompatible crosslinked polymers and their precursors include controlled delivery of drugs, prevention of post-operative adhesions, coating of medical devices such as vascular grafts, wound dressings and surgical sealants. Visualization agents may be included with the crosslinked polymers. Embodiments that include hydrogels having isolated hydrolytically degradable esters are set forth. Embodiments including the use of low molecular weight amines to make degradable hydrogels are also set forth.

A system and method for processing solid waste disposal includes a hydrolyzer (80) and a injection assembly (30) for transferring waste to the hydrolyzer (80). The injection assembly (30) includes a sleeve (40), in which waste is compressed with a ram (37), and a movable gate (52), which opens to allow the compressed waste (68) to exit the sleeve (40) and enter the hydrolyzer (80). The hydrolyzer (80) includes a pressure vessel (84), a rotating shaft (108) contained within the vessel (84), and agitates attached to the shaft for moving and processing the material through the hydrolyzer (80).

A method for production of fine microcapsules which encapsulate a hydrophilic bioactive substance at a high content and can be used in wide range of applications such as foods and medical drugs, which method enabling efficient industrial production, is provided. A method for production of S/O type microcapsules including the steps of: (1) emulsifying and dispersing a mixture of a solid fat and an aqueous solution containing a hydrophilic bioactive substance at a temperature of at least the melting point of the solid fat to obtain a W/O emulsion; (2) removing moisture in the W/O emulsion at a temperature of at least the melting point and lower than the boiling point of the solid fat to obtain an S/O suspension; (3) adding the S/O suspension into an aqueous phase containing at least one selected from a surfactant (B), a thickening agent and a hydrophilic organic solvent, and permitting liquid droplet dispersion at a temperature of at least the melting point and lower than the boiling point of the solid fat to obtain an S/O/W emulsion; and (4) cooling the S/O/W emulsion to lower than the melting point of the solid fat to harden the solid fat, and further removing the moisture at a temperature lower than the melting point of the solid fat.

A stock shape for a downhole tool component includes a magnesium alloy including a phase containing 70 to 95 wt. % of magnesium in which 0 wt. % or more and less than 0.3 wt. % of a rare earth metal, a metal material other than the magnesium and the rare earth metal, and 0.1 to 20 wt. % of a degradation accelerator are distributed, and the stock shape has an average particle size of the metal material of 1 to 300 μm, tensile strength of 200 to 500 MPa, and a degradation rate in a 2% potassium chloride aqueous solution at 93° C. of not less than 20 mg/cm² and not greater than 20000 mg/cm² per day. Accordingly, a downhole tool having high strength and being readily degradable is established.

The present invention relates to the inclusion of additives in a filter element comprising a non-woven sheet material or paper as the filter material to increase the selective removal of semi-volatile compounds and to improve the taste characteristics of the smoke drawn through the filter element. The increased selective removal of semi-volatile compounds from the smoke being drawn through the filter element is provided by polyethylene glycol. TEC and/or triacetin are additives which have been found to improve the taste characteristics of smoke drawn through the filter element.

An inkjet recording ink comprising an aqueous medium having dissolved or dispersed therein a dye having a specific property or structure, and containing at least one antiseptic is provided, which can ensure excellent ejection stability and color hue even after long-term aging of the ink and exhibit excellent weather resistance.

A vessel propulsion apparatus includes an exhaust passage guiding exhaust generated at an engine, a water jacket cooling at least a portion of the exhaust passage, a cooling device supplying water outside the vessel propulsion apparatus to the water jacket, an exhaust sensor detecting a concentration of a component in the exhaust in the exhaust passage, and a non-catalytic porous member disposed in the exhaust passage at an upstream side relative to the exhaust sensor. The non-catalytic porous member is a porous member that does not hold a catalyst.

An additive for thermoplastic materials is prepared to achieve controlled degradation and the manufacturing of very light coloured thermoplastics. The thermoplastics may be processed by film blowing, extrusion and injection molding. A ferric(III) salt is reacted with a C2o-C24 fatty acid or derivative under formation of a fat-soluble ferric (III) compound in a process where a suitable oxidizing agent ensures that all the iron in the end product is maintained in the ferric state.

The invention discloses a method for enhancing high-quality gelatin yield, which comprises the following steps: regulating the pH value of a colloidal liquid obtained by a pretreatment process, adding biological proteinase by stages to perform colloidal extraction, adding a bamboo charcoal-chitosan composite into the obtained colloidal liquid to perform adsorption filtration, bleaching and sterilizing with hydrogen peroxide, carrying out impurity removal and concentrating by a membrane process, and finally, drying with a flat plate to obtain the gelatin finished product. The stage-by-stage enzyme addition and colloidal extraction are adopted to completely hydrolyze collagens, so that the gelatin yield is greatly enhanced; and the bamboo charcoal-chitosan composite adsorption filtration, H2O2 treatment, membrane-process impurity removal and concentration and other steps are performed to obtain the high-viscosity high-jelling-power gelatin product.

The invention discloses a coated controlled-release fertilizer for modifying urea into an easily degradable film and a production method of the coated controlled-release fertilizer. The method comprises the following steps: heating common urea into a molten-state urea liquid, and uniformly mixing the molten-state urea liquid with a modifier and a curing agent; directly spraying the mixture on the surfaces of fertilizer particles for curing, reacting and forming a film, thereby obtaining a urea-modified coated controlled-release fertilizer which has smooth and dense film material surface and different water resistances. The product has excellent moisture controlled-release performance, the film material is low in cost, the film shell remained in soil is rapidly degraded, and the fertilizer belongs to the coated controlled-release fertilizer of which the film shell is easily degraded. In addition, the product is low in production cost, simple and convenient in production process flow and suitable for large-scale industrial production and popularization and application in gardening and field crops.

Provided is a hydrogel which comprises water as the main component at a high water content and has mechanical strength suitable for practical use and which exhibits high transparency and self-healing and shape-retaining properties. Also provided are both a material for the hydrogel and a novel polyionic dendrimer. A polyionic dendrimer which comprises a hydrophilic linear polymer as the core and polyester dendrons attached to both terminals of the linear polymer and in which cationic groups are bonded to the surfaces of the dendrons, said cationic groups being selected from the group consisting of guanidine group, thiourea group, and isothiourea group; a material for a hydrogel, which comprises the polyionic dendrimer and clay; and a hydrogel prepared using the material.

The invention discloses a modified brine workover fluid and a preparation method thereof, belonging to the technical field of workover fluids for workover during oil-gas field development. The modified brine workover fluid comprises brine, a modifier for preventing brine from fouling, a salt-resistant plugging agent, a tackfying-suspending agent, a unidirectional pressure sealing agent for a drilling fluid and oil-soluble resin. The salt-resistant plugging agent is prepared from the raw materials by mass: 100 parts of water, 8 to 12 parts of natural starch, 0.8 to 2 parts of pregelatinized starch, 1 to 3 parts of sodium tetraborate and 0.7 to 1 part of sodium chloride. The tackifying-suspending agent comprises the following components by mass: 99.0% to 99.5% of hydroxymethyl starch, 0.3% to 0.8% of N,N'-methylenebisacrylamide and 0.1% to 0.2% of thiosulfate. The modified brine workover fluid has the advantages of good plugging effect, a wide plugging range, high salt resistance, easy degradability, etc.

The invention relates to interpenetrating network polymer polyurea/polyurethane resin coated controlled release fertilizer and a production method thereof. Firstly, ordinary urea is heated to become amolten urea solution, the urea solution and a curing agent react to produce a polyurea prepolymer, the polyurea prepolymer is uniformly mixed with polyols and the curing agent, the mixture is directly sprayed to the surfaces of fertilizer particles for a curing reaction, films are formed, and the smooth and compact interpenetrating network polymer polyurea/polyurethane resin coated controlled release fertilizer with excellent water resistance can be obtained. The preparation cost is low, widely sourced urea and polyols are used as main raw materials, the controlled release fertilizer with different release cycles is prepared in combination with excellent properties of urea and polyols, and nutrient demands in each period of different crops can be met; a spray coating process is simple tooperate and does not require a solvent, curing is fast, the product production cost is low, and the interpenetrating network polymer polyurea/polyurethane resin coated controlled release fertilizer isvery suitable for large-scale industrial production and popularization and use in field crops.