6270 results about "Di-isocyanate" patented technology

Fast curing surgical adhesives and sealants contain an NCO-terminated hydrophilic urethane prepolymer derived from an aromatic diisocyanate and a polyol. Substantially all the aromatic diisocyanate used to prepare the NCO-terminated hydrophilic urethane prepolymer is in the para form. Optionally, the aromatic diisocyanate is substituted with at least one electron withdrawing group, such as, for example, a fluorine group.

Absorbable polyurethanes, polyamides and polyester urethanes prepared from at least one compound selected from:

or the diamines and diisocyanates thereof, wherein each X represents a member independently selected from —CH₂COO— (glycolic acid moiety), —CH(CH₃)COO— (lactic acid moiety), —CH₂CH₂OCH₂COO— (dioxanone), —CH₂CH₂CH₂CH₂CH₂COO— (caprolactone moiety), —(CH₂)_yCOO— where y is one of the numbers 2, 3, 4 or 6-24 inclusive, and —(CH₂CH₂O)_z′CH₂COO— where z′ is an integer between 2 and 24, inclusive; each Y represents a member independently selected from —COCH₂O— (glycolic ester moiety), —COCH(CH₃)O— (lactic ester moiety), —COCH₂OCH₂CH₂O— (dioxanone ester), —COCH₂CH₂CH₂CH₂CH₂O— (caprolactone ester), —CO(CH₂)_mO— where m is an integer between 2, 3, 4 or 6-24 inclusive, —COCH₂O(CH₂CH₂O)_n— where n is an integer between 2 and 24, inclusive; R′ is hydrogen, benzyl or an alkyl group, the alkyl group being either straight-chained or branched; p is an integer between 1 and 4, inclusive; and Rn represents one or more members selected from H, alkoxy, benzyloxy, aldehyde, halogen, carboxylic acid and —NO₂, which is attached directly to an aromatic ring or attached through an aliphatic chain. Absorbable polymers prepared from these compounds are useful for drug delivery, tissue engineering, tissue adhesives, adhesion prevention and other implantable medical devices.

Thermoplastic polyurethanes having an alternating sequence of hard and soft segments in which a nanostructured polyhedral oligosilsesquioxane diol is used as a chain extender to form a crystalline hard segment constituting SMPs. The polyurethanes are formed by reacting a polyol, a chain extender dihydroxyl-terminated polyhedral oligosilsesquioxane and a diisocyanate. The polyurethanes have multiple applications including for example, implants for human health care, drug delivery matrices, superabsorbant hydrogels, coatings, adhesives, temperature and moisture sensors, etc.

A polymerizable liquid, or resin, useful for the production by additive manufacturing of a three-dimensional object of polyurethane, polyurea, or a copolymer thereof, is described. The resin includes at least one of (i) a blocked or reactive blocked prepolymer, (ii) a blocked or reactive blocked diisocyanate, or (iii) a blocked or reactive blocked diisocyanate chain extender.

A method of forming a three-dimensional object of polyurethane, polyurea, or copolymer thereof is carried out by: (a) providing a carrier and an optically transparent member having a build surface, the carrier and the build surface defining a build region therebetween; (b) filling the build region with a polymerizable liquid, the polymerizable liquid including at least one of: (i) a blocked or reactive blocked prepolymer, (ii) a blocked or reactive blocked diisocyanate, or (iii) a blocked or reactive blocked diisocyanate chain extender; (c) irradiating the build region with light through the optically transparent member to form a solid blocked polymer scaffold and advancing the carrier away from the build surface to form a three-dimensional intermediate having the same shape as, or a shape to be imparted to, the three-dimensional object, with the intermediate containing the chain extender; and then (d) heating or microwave irradiating the three-dimensional intermediate sufficiently to form from the three-dimensional intermediate the three-dimensional object of polyurethane, polyurea, or copolymer thereof.

A silane-terminated polyurethane composition is the reaction product of a silane-terminated polyurethane prepolymer component, a silane-terminated monomeric diisocyanate, and optionally at least one multifunctional trisilane or tetrasilane component. A method for making a composition includes (a) providing a silane-terminated polyurethane prepolymer component, a silane-terminated monomeric diisocyanate component, and optionally at least one multifunctional trisilane or tetrasilane component, and (b) combining the prepolymer component, monomeric component, and optional multifunctional silane component to form a silane-terminated polyurethane reaction product with a tensile strength of about 4 MPa or greater and an elongation of about 200% or greater.

A perfluoropolyether-containing composition, which can easily conform to a fluorine-free substrate and can form a film on a surface of the substrate to fix the composition to the substrate surface, wherein the composition is a carbon-carbon double bond-containing composition comprising (A) a triisocyanate prepared by trimerizing a diisocyanate, and (B) a combination of at least two active hydrogen-containing compounds, and the component (B) comprises (B-1) a perfluoropolyether having at least one active hydrogen, and (B-2) a monomer having active hydrogen and a carbon-carbon double bond.

The invention discloses a preparation method and application of modified polyurethane aqueous dispersions of polyisocyanate curing agents. The preparation method comprises the following steps of: carrying out prepolymerization reaction by using polyester polyol, vulcabond monomer and a polyisocyanate curing agent; reacting with a hydrophilic chain-extending agent and a micro-molecule chain-extending agent to obtain polyurethane prepolymer containing hydrophilic groups (carboxyl or sulfonic groups) and isocyanate(NCO)-terminated groups; neutralizing the polymer into salt, and then dispersing the salt into water; and preparing the modified polyurethane aqueous dispersions of the polyisocyanate curing agents by the chain extending of a polyamine chain-extending agent. The modified polyurethane aqueous dispersions of the polyisocyanate curing agents have self-crosslinking function at room temperature, and the self-crosslinking density is over 85%. Compared with non-modified polyurethane aqueous dispersions prepared under the same condition, the modified polyurethane aqueous dispersions have superior film forming property, water resistance, alcohol resistance, pollution resistance, cold resistance, dry/wet rubbing resistance and chemical solvent resistance; and coating films have especially high drying speed, high hardness increment speed and high final hardness.

An insulation box unit and a refrigerator of the present invention employs i) rigid urethane foam with a 8.0 MPa-or-greater bending modulus, and a 60 kg/m³-or-lower density, and ii) a vacuum insulation material. The proper bending modulus provides the insulation box unit with a substantial strength, even in the case that the coverage of the vacuum insulation material with respect to the surface of the outer box exceeds 40%. The proper density prevents the insulation box unit from poor insulation efficiency due to undesired solid thermal conductivity. Despite of an extended use of the vacuum insulation material, the insulation box unit offers an excellent insulation efficiency and therefore accelerates energy saving. According to the recycling method of the present invention, rigid urethane foam formed of tolylene di-isocyanate composition, which was separated from refrigerator wastes, is recycled as a material of rigid urethane foam.

The invention discloses a dynamic bond-containing polyurethane material for 3D printing and its preparation method and use. The preparation method utilizes, by mole, 100 parts of diisocyanate, 50-75 parts of polyester polyol or polyether polyol, 50-125 parts of a Diels-Alder bond-containing dihydric alcohol chain extender, 0-50 parts of a diisocyanate trimer cross-linking agent, 50-100 parts of a ligand-containing dihydric alcohol chain extender and 0-50 parts of a metal salt cross-linking agent. The Diels-Alder bond-containing dihydric alcohol chain extender and the diisocyanate trimer cross-linking agent are matched and are used for preparation of a Diels-Alder bond-containing polyurethane material. The ligand-containing dihydric alcohol chain extender and the metal salt cross-linking agent are matched and are used for preparation of a metal ligand-containing polyurethane material. Molecular structures of the prepared polyurethane materials contain a dynamic medical bond Diels-Alder bond and a metal ligand bond. The Diels-Alder bond-containing or metal ligand-containing polyurethane material has functions of self-restoration and self-bonding.

The invention relates to composite compositions having a matrix of polymer networks and dispersed phases of particulate or fibrous materials. The polymer matrix contains a polyurethane network formed by the reaction of a poly- or di-isocyanate and one or more saturated polyether or polyester polyols, and an optional polyisocyanurate network formed by the reaction of optionally added water and isocyanate. The matrix is filled with a particulate phase, which can be selected from one or more of a variety of components, such as fly ash particles, axially oriented fibers, fabrics, chopped random fibers, mineral fibers, ground waste glass, granite dust, or other solid waste materials. The addition of water can also serve to provide a blowing agent to the reaction mixture, resulting in a foamed structure, if such is desired.

A water-based intermediate coating composition which contains a water-dispersible polyurethane composition is used. Here, the water-dispersible polyurethane composition is obtained from: a polyisocyanate component containing diisocyanate as an essential component; a polyol component containing polycarbonatediol with an average molecular weight of 500 to 5,000 and carboxyl group-containing diol as essential components; an amine component containing a monoamine compound as an essential component; a carboxyl group-neutralizing component; and water. A three-layered coating film including the water-based intermediate coating, a water-based base coating and a clear coating is formed through a wet-on-wet process on a material onto which an electrodeposited coating film is formed. Thereafter, the three coating films are baked and cured at the same time, thereby forming a multilayer coating film.

The present invention relates to reactive compositions containing A) one or more blocked polyurethane prepolymers which have a content of blocked isocyanate groups (calculated as NCO) of 0.1 to 20 wt. % and are prepared from i) at least one aromatic, aliphatic, araliphatic and/or cycloaliphatic diisocyanate having a content of free NCO groups of 5 to 60 wt. %, ii) a polyol component containing at least one polyester polyol, and/or at least one polyether polyol and/or at least one polycarbonate polyol,

iii) CH-acidic cyclic ketones corresponding to formula (I) as blocking agents

wherein X represents an electron-attracting group,

• R¹ and R² independently of one another represent the radicals H,
• C₁-C₂₀ (cyclo)alkyl, C₆-C₂₄ aryl, C₁-C₂₀ (cyclo)alkyl ester or amide, C₆-C₂₄ aryl ester or amide, mixed aliphatic/aromatic radicals with 1 to 24 carbon atoms that can also be part of a 4- to 8-membered ring, n is an integer from 0 to 5, and B) one or more OH-functional compounds in which the OH component undergoes activation by a deposition amine component. The present invention also relates to a composite system containing two adherends bonded together with the reactive composition according to the invention.

A power transmission belt having a main belt body portion of elastomeric material, a tensile reinforcement such as carbon fiber cord, disposed in said body portion, and a sheave contact portion integral with said main body portion. The elastomeric material includes the reaction product of a polyisocyanate prepolymer composition and a chain extender. The polyisocyanate prepolymer composition is prepared by reacting a diisocyanate and a polyol substantially free of moieties oxidative at less than about 150° C. and at least one triol crosslinker selected from the same group of polyols. Either before or after reacting the prepolymer, a plasticizer selected from the group consisting of alkyl-ether di-alkylesters such as polyethylene glycol di-alkylester is added thereto. The chain extender is an aromatic symmetric primary or secondary diamine chain extenders.

The present invention relates to an aqueous polyurethane coating composition comprising:

• 1) 1 to 99 wt. % of the reaction product of:
  • a) a polyol component, which is soluble or dispersible in water and is the reaction product of a polyisocyanate component containing 50 to 100 wt. % of an aliphatic diisocyanate, a polyol component containing one or more polyether polyols and having an OH number of 25 to 350 mg KOH/g solids and an isocyanate-reactive component containing at least one group capable of salt formation; and
  • b) polyisocyanate component, which is soluble or dispersible in water, has blocked isocyanate groups and is the reaction product of one or more polyisocyanates having an isocyanurate group content of 2 to 30 wt. %, a reversible, monofunctional blocking agent for isocyanate groups, a nonionic hydrophilic component and a stabilizing component which has 1 to 2 hydrazide groups and a molecular weight of 70 to 300; and
• 2) 1 to 99 wt. % of an aqueous polyurethane dispersion prepared from at least one polycarbonate polyol,

wherein the total wt. % of components 1) and 2) add up to 100%.

The invention relates to a method for preparing a high solid content latent cured polyurethane acrylic acid heterozygous latex and an application thereof. The preparation method comprises the following steps: pre-polymerizing polyester polyalcohol, hydrophilic chain extender and diisocyanate monomer to obtain the polyurethane prepolymer containing a hydrophilic group (carboxyl or sulfo group) and a terminal NCO group; then, neutralizing the polymer into salt and dispersing the salt in water to prepare the polyurethane water dispersoid; finally, using the dispersoid as macro molecular emulsifying agent and reactant to emulsify and disperse the acrylic ester monomer, initiating the polymerization by heating, dropping initiator to perform the latex polymerization, and regulating the pH of the latex by adding a latent curing agent to obtain the high solid content latent cured polyurethane acrylic acid heterozygous latex. The high solid content latent cured polyurethane acrylic acid heterozygous latex has a solid content of above 45%; the storage of the high solid content latent cured polyurethane acrylic acid heterozygous latex is stable; and high hardness film coating can be formed at the room temperature. Compared with acrylic acid latex and polyurethane latex, the high solid content latent cured polyurethane acrylic acid heterozygous latex has better film forming performance, water resistance, alcohol resistance, pollution resistance, dry/wet cleaning resistance and chemical solvent resistance, as well as high hardness.

The invention belongs to the technical field of self-repairing elastomer materials, and discloses a high-strength room-temperature self-repairing polyurethane elastomer based on multiple dynamic reversible effects as well as preparation and application thereof. A preparation method comprises the following steps: 1) reacting a dihydric alcohol with a diisocyanate under the action of a catalyst to obtain a prepolymer; wherein the dihydric alcohol is a mixture of more than one from a polyether glycol and a polysiloxane glycol; 2) reacting a dicarboxylic acid chain extender with the prepolymer toobtain an oligomer; adding a diamine chain extender, continuously reacting, and carrying out subsequent treatment to obtain polyurethane; wherein the dicarboxylic acid chain extender and the diamine chain extender are collectively called as chain extenders, and the chain extenders contain disulfide bonds and pyridine groups; 3) in an organic solvent, reacting polyurethane with a metal salt cross-linking agent, and removing the solvent to obtain the high-strength room-temperature self-repairing polyurethane elastomer. The preparation method is simple and mild in condition, and the prepared polyurethane elastomer is excellent in mechanical property and high in self-repairing efficiency and is applied to a flexible substrate materials, wearable equipment and intelligent protective coating.

Bioabsorbable macromer compositions are provided including a diisocyanate-functional bioabsorbable polymer. In some embodiments, the diisocyanate-functional bioabsorbable polymer can be combined with a functionalized polyol. The resulting bioabsorbable macromer composition can be employed as an adhesive or sealant for medical/surgical uses.

The invention discloses a method for improving water resistance of a polyvinyl alcohol film by using poly(trimethylene carbonate) and poly(p-dioxanone). The method comprises the following steps of (1) adding poly(trimethylene carbonate), diisocyanate, a catalyst and a solvent into a drying reactor, and reacting while stirring at the temperature of 50-55 DEG C to obtain end-NCO group contained poly(trimethylene carbonate); (2) adding end-NCO group contained poly(trimethylene carbonate), polyvinyl alcohol, a solvent and a catalyst into the drying reactor, and reacting while stirring at the temperature of 50-55 DEG C to obtain a polyvinyl alcohol and poly(trimethylene carbonate) grafted copolymer; (3) adding the polyvinyl alcohol and poly(trimethylene carbonate) grafted copolymer, poly(p-dioxanone) and a solvent into the drying reactor, stirring and mixing at the temperature of 40-50 DEG C, filming by using a tape casting method and drying to obtain a target product required by the invention. The method is simple in preparation process and easy to master, and the water resistance of the obtained modified film is greatly improved.

A compound for imparting water repellency and optionally stain release to substrates wherein the compound is prepared by (i) reacting (a) at least one isocyanate group-containing compound selected from isocyanate, diisocyanate, polyisocyanate, or mixture thereof, and (b) at least one isocyanate-reactive compound selected from formula (Ia), (Ib), or (Ic):

The invention discloses a reactive polyurethane hot-melt adhesive for edge sealing in wood industry, which is prepared from the following raw materials in percentage by weight: 10-30% of crystalline polyester polyol, 10-30% of amorphous polyester polyol, 8-15% of high-molecular-weight thermoplastic resin, 10-25% of diisocyanate, 1-8% of plasticizer, 10-30% of inorganic filler, 0.05-0.5% of antioxidant and 0.05-0.5% of ultraviolet absorbent. In addition, the invention also discloses a preparation method of the reactive polyurethane hot-melt adhesive. The adhesive disclosed by the invention has the advantages of extremely high drying speed, excellent initial bonding strength and final strength, high heat resistance, high storage stability, excellent environment friendliness, simple preparation technique, low cost and the like. The invention can well satisfy the requirements for edge sealing in wood industry, and is beneficial to industrialization of edge sealing production in wood industry.

The invention discloses high-performance environment-friendly type water-borne polyurethane. The high-performance environment-friendly type water-borne polyurethane is mainly prepared from the following materials in parts by weight: 80-100 parts of polyester polyol, 20-56 parts of aliphatic diisocyanate, 3.5-10 parts of hydrophilic chain extender, 0-8 parts of micromolecule chain extender, 0.01-0.05 part of environment-friendly type catalyst, 5-30 parts of solvent with a low boiling point, 3-12 parts of neutralizer, 0-10 parts of post chain extender and 160-400 parts of deionized water. The invention further discloses a preparation method of the polyurethane. The polyurethane is free of toxic and harmful substances including an organic tin catalyst, N-methylpyrrolidone, a solvent with a high boiling point and the like, capable of satisfying the requirements of latest EU environmental standard rules, anti-yellowing, extremely good in water and heat resistance, good in adhesion resistant adhesion, strong in storage stability, good in gloss, high in solid content and excellent in comprehensive performance.