45 results about "Segmented polyurethane" patented technology

A segmented polyurethane and an amphiphilic random or block copolymer are disclosed. The segmented polyurethane and the amphiphilic random or block copolymer can be used for fabricating a coating for an implantable medical device such as a stent.

The invention relates to hydrophilic degradable segmented polyurethane as well as a preparation method and application thereof. The segmented polyurethane provided by the invention is a polymer of tri-block polyester polyol, diisocyanate, a chain extender and a catalyst, wherein the tri-block polyester polyol is a polymer of e-caprolactone monomer and polyethylene glycol with the molecular weight of 2000 according to a mol ratio of (8.75-70):1. The preparation method comprises the following steps: sufficiently mixing the e-caprolactone monomer, the polyethylene glycol and the catalyst, and polymerizing to form the tri-block polyester polyol; dissolving the tri-block polyester polyol in an organic solvent, adding the diisocyanate and the catalyst to obtain a prepolymer; and finally adding the organic solvent and the chain extender, sufficiently stirring and mixing for 7h, pouring into a mould and evaporating the organic solvent to obtain the product. The segmented polyurethane provided by the invention is excellent in tensile strength, hydrophilia and biodegradability, suitable for use in the tissue engineering and tissue repair, and particularly suitable for use as a rack and a rack coating.

A reactive hotmelt adhesive is prepared which contains a reaction product of a stoichiometric excess of a polyisocyanate with a hydroxyl-functional polyester-ether block copolymer based on aromatic dicarboxylic acids. The adhesive additionally contains a reaction product of a polyisocyanate and at least one of either a polyether polyol or a polyester polyol. A thermoplastic polymer may also be present.

The present disclosure relates to a vessel/tissue protection device having a polymer coated reinforcing layer. The polymer can comprise a biocompatible polymer that will not promote tissue in-growth or attachment, such as segmented polyurethane, polycarbonate urethane, polyether urethane, polyacrylonitrile, etc. The reinforcing layer can comprise any suitable woven, non-woven, knitted, or braided reinforcing polymer, fabric, or foil that is biocompatible and capable of holding a suture, staple, or other attachment device.

The invention discloses a method for manufacturing a polyether organosilicone segmented polyurethane material, a product and application. The method for manufacturing the polyether organosilicone segmented polyurethane material comprises the following steps that (1), under the condition of protective gas, namely, the solvent-free condition, MDI and PEO-PDMS-PEO are evenly mixed, and copolymerization is carried out under the condition of 70 DEG C to 100 DEG C, and polyether organosilicone block polyurethane prepolymer is manufactured; (2), the polyether organosilicone block polyurethane prepolymer and BDO are mixed evenly, the mixture is poured into a preheated teflon disc, then, the teflon disc is placed in an oven of 110 DEG C to be heated for 1 h, the teflon disc continues to be cured in an oven of 90 DEG C for 12 h after demolding, and the teflon disc is cured for one week at room temperature. The method is simple in step, free of solvents and more environmentally friendly. The polyether organosilicone segmented polyurethane material is excellent in mechanical property, low temperature property and hydrophobic property, no solvent residue exists, and the material can be used as a biological material implanted into a human catheter.

The invention discloses a nano bentonite modified waterborne polyurethane coating, which comprises: 55 to 75g of polyether polyol, 10 to 30g polyisocyanate, 3.5 to 7.5g of hydrophilicity chain expanding agent, 1.5 to 3.5g of crosslinking agent, 1.5 to 5.5g of salt forming agent, 0.8 to 3.8g of nanometer bentonite, 170 to 270g of deionized water; the particle size of nanometer bentonite is 20 to 100nm. The nano bentonite modified waterborne polyurethane coating is bonded with segmented polyurethane by hydrogen bond formation, reinforces the acting force between molecules, improves cohesive force of hard segment domain after film forming, improves degree of phase separation of soft and hard segment domain, has excellent mechanical property, and strong ultraviolet and ageing resistant function.

The invention relates to a preparation method of an ultraviolet light polymerization fluorosilicone release film for optical display. The method comprises the following steps of firstly performing polymerization reaction on hydroxyalkyl silicone oil, fluorine-containing dihydric alcohol and diisocyanate under the effects of organic tin catalysts; then, adding polymerization inhibitors and acrylichydroxyl ester for termination so as to prepare fluorosilicone segmented polyurethane acrylate oligomers; next, active diluent monomers and photoinitiators are added for uniform mixing; a release agent is obtained; the release agent is uniformly coated onto an organic substrate; after ultraviolet light curing, the release film is obtained. The ultraviolet light polymerization fluorosilicone release film for optical display has the advantages that the release force is light; the fog degree is low; the light transmission rate and the residue attachment rate are high; the attaching force of the coating film on the polyethylene glycol terephthalate film is at the grade 1; the release film can be widely used for formation components of various displays of polarizers for tablet displays, organicEL and the like; the preparation method is simple; the addition of organic solvents is not needed in the coating curing process; the harm of solvents to the human body and the environment can be effectively avoided.

The present invention relates to novel cross-linkable or crosslinked photochromic compositions, articles made from or coated with the compositions and method of making the compositions. The compositions contain (i) at least one segmented or non-segmented polyurethane-type or polyurethane-urea-type linear polymer having at least one non-terminal moiety that comprises at least one unsaturated group; and (ii) an effective amount of at least one photochromic organic compound, advantageously selected from spiroxazines, chromenes, spiropyrans fulgides and fulgimides.

A gel for an ultrasonic phantom is provided which has satisfactory ultrasonic characteristics, does not fluctuate in ultrasonic characteristics over long, and is free from germ multiplication, alteration, putrefaction, etc.

The gel is a gel for ultrasonic phantoms which comprises: a segmented polyurethane gel having alkylene oxide segments which are mostly or wholly liquid at ordinary temperature; and a nonvolatile organic gel-swelling medium not participating in a urethane-forming reaction, the medium being contained in the segmented polyurethane gel. Due to the nonvolatile organic gel-swelling medium, the liquid segments and the like are kept in an extended state and the distance between the segments is increased. The gel hence has satisfactory ultrasonic characteristics concerning ultrasonic attenuation rate, propagation velocity, etc. The gel does not change in swelling-medium content with time and hence retains the satisfactory ultrasonic characteristics over long. Furthermore, the gel is free from germ multiplication, alteration, putrefaction, etc. because of the organic gel-swelling medium contained therein.

Segmented polyurethane/ureas useful for the production of spandex are produced by chain extending, in the presence of a solvent, an isocyanate-terminated prepolymer prepared by reacting a stoichiometric excess of an isocyanate with an isocyanate-reactive component which includes: (1) from about 5 to about 30 equivalent percent of a polyoxypropylene diol having a molecular weight of at least 1500 Da and an unsaturation level less than or equal to 0.03 meq/g; (2) from about 20 to about 60 equivalent percent of a polytetramethylene ether glycol having a molecular weight less than 1000 Da; and (3) from about 25 to about 65 equivalent percent of a polytetramethylene ether glycol having a molecular weight greater than or equal to 1000 Da.

This invention provides compositions and methods for reversible ionic crosslinking in polymers, providing tunability of polymer mechanical properties. Some variations provide a polymer composition comprising: a polymer containing a plurality of ionic species disposed along the chain backbone of the polymer, wherein the plurality of ionic species has an ionic charge polarity that is negative or positive; a redox reagent; and a reversible crosslinking agent capable of changing from a first oxidation state to a second oxidation state when in the presence of the redox reagent. The different oxidation states are associated with different coordination numbers between the reversible crosslinking agent and the ionic species contained in the polymer. This difference provides reversible ionic crosslinking. The polymer may be selected from polyurethanes (including segmented and non-segmented polyurethanes), polyacrylates, or polyamides, for example. These polymers are useful for many commercial applications, including coatings and polymer parts.

Segmented polyurethane/ureas useful in the production of spandex are produced by chain extending an isocyanate-terminated prepolymer in the presence of a solvent. The isocyanate-terminated prepolymer is formed by reacting a stoichiometric excess of an isocyanate with an isocyanate-reactive component that includes more than 50 equivalent percent of a high molecular weight polyoxyalkylene diol having an unsaturation level no greater than about 0.015 meq/g and up to about 50 equivalent percent of a polytetramethylene ether glycol.

Segmented polyurethane/ureas useful for the production of spandex, particularly spandex fibers, are made from isocyanate-terminated prepolymers formed by reacting excess isocyanate with an isocyanate-reactive component satisfying specified compositional requirements in the presence of a catalyst which promotes linear polymerization but does not cause degradation of the polymer. Suitable catalysts include metal salts of organic fatty acids and/or of naphthenic acid. The isocyanate-reactive component includes at least 10 equivalent percent of a polyoxypropylene diol having a number average molecular weight of at least about 1500 Da and an average unsaturation level less than or equal to 0.03 meq/g and up to 90 equivalent percent of a polytetramethylene glycol having a number average molecular weight of at least 200 Da.

Disclosed herein is a process for preparing an antimicrobial elastic fiber. The process comprises: mixing a glass compound, as an antimicrobial agent, containing ZnO, SiO₂, and an alkali metal oxide, and having an average particle size of 0.1 μm to 5 μm, with a dispersant; sand grinding or milling the mixture; and adding the ground or milled mixture to a solution of a segmented polyurethane polymer to prepare an elastic yarn. The process can provide advantageous effects that spinnability is improved and the color of yarn remains unchanged.