8815 results about "Polydimethylsiloxane" patented technology

A medical device having a contact surface exposed repeatedly to bodily tissue is disclosed. The contact surface is coated with a silicone polymer and one or more non-silicone hydrophobic polymers. The preferred medical device is a surgical needle, and the preferred coating is a polydimethylsiloxane and polypropylene wax hydrocarbon mixture. The incorporation of the non-silicone hydrophobic polymer increases the durability of the coating on the device without sacrificing lubricity.

A flame retardant thermoplastic composition having excellent physical properties comprises about 20 to about 90 wt. % of a polycarbonate resin; up to about 35 wt. % of an impact modifier; about 0.5 to about 30 wt. % of a polysiloxane-polycarbonate copolymer comprising about 8 to about 30 wt. % polydimethylsiloxane units or the equivalent molar amount of other diorganosiloxane units; and about 0.5 to about 20 wt. % of a phosphorus-containing flame retardant, each based on the total combined weight of the thermoplastic composition, exclusive of any filler. In one embodiment a sample of the thermoplastic composition having a thickness of 2.5 mm (±10 % ) achieves a UL94 5VA rating Thinner samples may also achieve this rating. The compositions are useful in forming flame retardant thin-walled articles.

The invention discloses a flexible current collector for a lithium battery and a preparation method thereof. The flexible current collector comprises a flexible substrate layer, a metal conductive plated layer and a conductive anti-oxidization layer which are combined tightly in sequence, wherein the flexible substrate layer is one of polyvinyl chloride, polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polydimethylsiloxane and polyimide; the thickness of the flexible substrate layer is 1-20 microns; the metal conductive plated layer is one of Cu, Al, Ni, Au and Ag and the thickness of the metal conductive plated layer is 0.1-5 microns; and the conductive anti-oxidization layer is at least one of conductive graphite, graphene, carbon nanotubes and carbon nano-fibers, and the thickness of the conductive anti-oxidization layer is more than 0 and smaller than 1 micron. The flexible current collector disclosed by the invention has high machinability and relatively high thermal stability and anti-oxidization energy; and the quality density of a whole body is small.

Provided herein is a composite, comprising: a polymer host selected from the group consisting of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), and polypropylene (PP), polyurethane, polycaprolactone (PCL), polydimethylsiloxane (PDMS), polymethylmethacrylate (PMMA), and polyoxymethylene (POM); and a guest molecule comprising hyaluronic acid; wherein the guest molecule is disposed within the polymer host, and wherein the guest molecule is covalently bonded to at least one other guest molecule. Also provided herein are methods for forming the composite, and blood-contracting devices made from the composite, such as heart valves and vascular grafts.

A flame retardant thermoplastic composition having excellent physical properties that includes 20 to 90 wt. % of a polycarbonate resin; from 1 to 35 wt. % of an impact modifier; from 0.5 to 30 wt. % of a polysiloxane-polycarbonate copolymer including from 8 to 30 wt. % polydimethylsiloxane units or the equivalent molar amount of other diorganosiloxane units; from 0.5 to 20 wt. % of a phosphorus-containing flame retardant, and from 3 to 30 wt. % of metal fiber, each based on the total combined weight of the thermoplastic composition, exclusive of any filler. In one embodiment, a molded sample of the thermoplastic composition having a thickness of 3.0 mm (±10%) has an EMI shielding of at least 20 dB. In addition, a molded sample of the thermoplastic composition is capable of achieving UL94 V0 or V1 rating at a thickness of 1.5 mm (±10%). The compositions are useful in forming flame retardant articles having EMI shielding characteristics.

Provided is a siloxane dispersant having a structure including a head part having an affinity for nanoparticles and a tail part having an affinity for a polydimethylsiloxane (PDMS) resin, and a nanoparticle paste composition comprising the same. The dispersant significantly improves dispersion efficiency of a polydimethylsiloxane resin system which is used in preparation of high-output light sources such as UV LEDs and the like.

The invention provides a chain-extended polydiorganosiloxane vinylic crosslinker which comprises (1) a polymer chain comprising at least two polydiorganosiloxane segments and one hydrophilized linker between each pair of polydiorganosiloxane segements, wherein each polydiorganosiloxane comprises at least 5 dimethylsiloxane units in a consecutive sequence, wherein the hydrophilized linker is a divalent radical having at least two (meth)acrylamide moieties; (2) two terminal (meth)acryloyl groups, wherein the chain-extended polydiorganosiloxane vinylic crosslinker has an average molecular weight of at least about 1500 Daltons. The present invention is also related to a silicone hydrogel contact lens, which comprises repeating units derived from a chain-extended polydiorganosiloxane vinylic crosslinker of the invention. In addition, the invention provides a method for making silicone hydrogel contact lenses using a lens-forming formulation comprising a chain-extended polydiorganosiloxane vinylic crosslinker of the invention.

A new family of triblock (A-B-A type) thermoplastic, polyurethane, polyurethaneurea, polyurea and polyamide copolymers has been prepared. (A) blocks represent the hard segments, such as urethane, urea, urethaneurea or amide type segments. (B) blocks represent the soft segments, such as aliphatic polyethers, aliphatic polyesters, polydimethylsiloxanes, polyalkanes or their copolymers. These novel material display very interesting microphase morphologies, mechanical properties, solubility characteristics and melt behavior.

The invention discloses a high temperature resistant heat-conducting silica gel sheet and a preparation method thereof. The high temperature resistant heat-conducting silica gel sheet is characterized by comprising the following components in parts by weight: 50-80 parts of vinyl end capped polydimethylsiloxane (PDMS), 20-50 parts of vinyl end capped methyl phenyl silicone oil, 0.3-10 parts of containing hydrogen silicone oil, 2-6 parts of platinum catalyst, 0.2-0.6 parts of inhibitor, 5-100 parts of heat resistant additive and 400-1200 parts of heat-conducting powder. The preparation method of the high temperature resistant heat-conducting silica gel sheet comprises the following steps: firstly, uniformly mixing the vinyl end capped polydimethylsiloxane and the vinyl end capped methyl phenyl silicone oil in a kneading machine; adding the treated or untreated heat-conducting powder and the heat resistant additive which are added in batches, after mixing uniformly, adding the containing hydrogen silicone oil, the inhibitor and the catalyst; and mixing uniformly, and heating and solidifying in a forming machine to form a sheet. The heat resistant silica gel sheet provided by the invention is aged at 250 DEG C for 1000 hours, but still has good usability, and the changes of the hardness and the heat conductivity coefficient are within acceptable ranges.

The invention provides a method for manufacturing and integrating a multichannel high-sensitive biosensor. The method comprises the following steps: firstly, based on an SOI silicon chip, adopting a top-down method to manufacture an FET field effect transistor of a silicon nanometer wire; secondly, utilizing polydimethylsiloxane (PDMS) to manufacture a plurality of microfluid channels; and finally, modifying the silicon nanometer wires in different microfluid channels to allow the silicon nanometer wire to be modified with different detecting antibodies and small molecules for detecting different target molecules. The sensor manufacture by the method can be used for simultaneously detecting relevant factors (such as DNA, RNA, protein and the like) or virus of different types of diseases and has the characteristics of high sensitivity, stability, easy integration and the like.

This invention discloses a production method of flexibility humidity sensor. Its character is washing a dimethyl siloxane interlayer on silicon dice carrier firstly, after solidification in room-temperature, activing the surface with oxygen plasma, then washing high viscosity polyimide again and procuring with staged technology, then, overlapping and depositing all the metal coating and using stripping technology and wet-method corroding figure technology to firm mental humidity-dependent resistor and electric connector, after this, overlapping a light low viscosity PI protective layer, using wet method to corrode the outside metal press welding part; then putting the device on the heating plate and peeling the interlayer from the flexible carrier, after all, putting the flexible carrier peeled into the bake oven to solidify it to two PI membranous layers completely, so realizing the compatible craft. The method to make it is simple, the cost is low and the rate of finished products is high, and it is more near the achievement of mass production and the integration of the high density sensor.

The invention belongs to the technical field of intelligent energy storages, and particularly relates to a super capacitor capable of changing colors and being stretched and a manufacturing method thereof. According to the super capacitor, a carbon nano tube film is evenly laid on an elastic polydimethylsiloxane substrate in a stretched state, polyaniline is electrodeposited on the carbon nano tube film, and the carbon nano tube film serves as one electrode after pull force on polydimethylsiloxane is eliminated; a hole and the surface of a carbon nano tube/polyaniline combination electrode are evenly coated with a layer of polyvinyl alcohol/phosphoric acid gelatinous electrolytes, then the carbon nano tube/polyaniline combination electrode and the other electrode which is made of the same material and has the same structure are assembled, and the intelligent super capacitor capable of being stretched can be obtained. The super capacitor not only has good flexibility and stretchability, but also can display different colors along with different voltages of the two electrodes, different energy storage states can be displayed through color states, and therefore a good application prospect is obtained.

The invention relates to a single-component catalytic dealcoholized room temperature vulcanized (RTV) silicone rubber which comprises the following components in parts by weight: 100 parts of alpha, omega-dihydroxyl polydimethylsiloxane, 10-450 parts of function filler, 0.4-20 parts of crosslinking agent, 0.1-8 parts of coupling agent and 0.1-12 parts of catalyst. The invention also relates to a preparation method of the single-component catalytic dealcoholized RTV silicone rubber, and the method comprises the following steps of: preparing a ground mass, namely dewatering and blending the alpha, omega-dihydroxyl polydimethylsiloxane and the function filler to obtain the ground mass; stirring the taken ground mass in a vacuum state, adding the crosslinking agent, and stirring the materials in a vacuum state; adding the coupling agent, and stirring the materials; and adding the catalyst, vacuumizing, introducing inert gas, stirring, vacuumizing, and stirring to obtain the single-component catalytic dealcoholized RTV silicone rubber. The method provided by the invention has the advantages of no generation of viscosity peak, simple process and cost saving; and the single-component catalytic dealcoholized RTV silicone rubber has excellent comprehensive properties.

The present invention relates to a composition used as a vehicle for percutaneous absorption of Pharmaceutical and Cosmaceutical active agents that comprises Dimethiconol (hydroxyl-terminated polydimethydimethylsiloxane), dimethicone-350 (polydimethylsiloxane-350), cyclomethicone-5 nf (decamethylcyclopentasiloxane), alkymeth siloxane copolyol-lauryl peg/ppg 18/18 methicone (alkymethyl siloxane copolyol), cyclopentasiloxane and dimethicone Crosspolymer (silicone elastomer and decamethylcyclopentasiloxane), stearoxytrimethylsilane and stearyl alcohol (silicone wax), and deionized water. This composition serves several key applications: (1) it is a vehicle for percutaneous absorption of Pharmaceutical and Cosmaceutical active agents; (2) it acts as a method for utilizing other compositions in the treatment of inflammatory conditions of the skin including, but by no means limited to, atopic dermatitis (eczema), allergic contact dermatitis, seborrheic dermatitits, psoriasis, xerosis and atopia; (3) it is a treatment of inflammatory conditions of mucosae; (4) it relates to other compositions and methods for protecting and enhancing the barrier function of the skin.

The invention relates to a microfluidic control chip which is formed by bonding and sealing PDMS (Polydimethylsiloxane) material integrated with a micro valve, and comprises an upper layer of air control passage, a middle layer of PDMS membrane and a lower layer of microfluidic passage. A real-time PCR virus quick detection device comprises the microfluidic control chip, a temperature control unit, a signal detection unit and a data processing and control unit. The invention designs the microfluidic control chip which is integrated with the micro valve, is in a three-layer PDMS structure, andis used for virus detection and the real-time fluorescent PCR detection device. Compared with the traditional method, the invention has the advantages of short time, less sample usage, quick detection speed, simpleness and convenience in operation, integration and the like.

The present invention provides a safe ocular lens material having high oxygen permeability, excellent surface wettability, the excellent lubricity/easy lubricating property of surface, little in surface adhesive and superior flexibility and stress relaxation, in addition, suppressing elution of a monomer from the final product. That is, the present invention relates to an ocular lens material comprising at least one kind of a compound (A) having an ethylenically unsaturated group and polydimethylsiloxane structure through a urethane bond and at least one kind of a pyrrolidone derivative (B) in which a polymerizable group is a methylene group.