Abstract: The present invention relates to a new process for preparing polyisocyanates containing isocyanurate groups and being flocculation-stable in solvents from (cyclo)aliphatic diisocyanates.

Abstract: Disclosed is a composition for forming a polyurethane film with improved reaction stability, comprising an OH group-containing polymer; an isocyanate-based compound as a curing agent; and an alicyclic urea diol compound having two urea groups and an OH group at two terminals, and a polyurethane film with improved self-healable property from tear, derived from the composition.

Abstract: The present disclosure provides copolymers useful in medical devices. For example, the disclosure provides copolymers comprising the polymerization product ester block, ether blocks and diisocyanates. In certain embodiments, the disclosure provides a medical copolymer for implantation comprising ester blocks and ether blocks, wherein: the ester blocks comprise a negative free energy transfer and the ether blocks comprise a positive free energy transfer, the ether and ester blocks are less than 1/10 the length of said copolymer, and, the blocks are distributed such that no domain of contiguous blocks possessing the same polarity of free energy transfer are less than ? of the molecular weight of the copolymer. The disclosure further provides methods of making the aforementioned polymers, and medical devices comprising the polymers.

Abstract: A method for preparing a polyol comprises the following steps of: (1) dissolving 2,3 -epoxybutane and an acid catalyst in an inert solvent to obtain a solution A; dissolving triethylene glycol in an inert solvent to obtain a solution B; and dissolving epoxy vegetable oil in an inert solvent to obtain a solution C; (2) respectively and simultaneously pumping the solutions A and B into a first micromixer for mixing; (3) pumping the solution C and an effluent of the first microreactor into a second micromixer for mixing while carrying out step (2); and (4) dissolving the vegetable oil polyol in an inert solvent to obtain a solution D; dissolving epoxypropane and an alkaline catalyst in an inert solvent to obtain a solution E; and pumping the solution D and the solution E into a tank reactor for reaction, thereby obtaining the polyol.

Abstract: A catalyst composition comprising at least a catalyst compound selected from multi metal cyanide compounds for the selective production of oxazolidinone compounds by reacting an isocyanate compound with an epoxide compound and oxazolidinone comprising materials obtained using said catalyst compound.

Abstract: The present invention relates to an isocyanate-reactive component B) comprising: B1) one or more organic polyols selected from the group consisting of polyether polyols, polyester polyols, polyetherester polyols, polymer polyols, polycarbonate polyols and polyethercarbonate polyols; B2) one or more compounds having the structure of Formula (I) wherein R1 is selected from the group consisting of hydrogen, methyl or ethyl; R2 is selected from the group consisting of alkylene having 2 to 6 carbon atoms, 2,2-bis(4-phenylene)propane, 1,4-bis(methylene)benzene, 1,3-bis(methylene)benzene, 1,2-bis(methylene)benzene; n is an integer selected from 1 to 6; and B3) at least one radical reaction adjuvant selected from the group consisting of aryl-substituted olefins, a composite material comprising a thermosetting polyurethane-polyacrylate resin matrix made with such isocyanate-reactive component B) and a reinforcement material and a process of preparing the same.

Abstract: Provided is a photo-curable composition capable of creating a three-dimensional object excellent in both of: stiffness and strength; and toughness.

Abstract: A method for removing compounds in the gaseous aggregate state from PLA-containing products in the viscous aggregate state by means of a thin-film evaporator. The compounds may be present in the liquid or solid aggregate state in the products under standard conditions. The invention further relates to a polylactide resin prepared in accordance with the method of the invention.

Abstract: The present disclosure provides new methods for preparing carbodiimides including steps of carbodiimidizing monomeric aromatic isocyanates in the presence of a catalyst, separating low boilers and catalyst from the reaction product in a thin-film evaporator, and distilling the residue from the thin-film evaporation in a further thin-film evaporator.

Abstract: The present invention provides a reaction mixture comprising a blend of a first isocyanate-based uretdione-containing resin and a second isocyanate-based uretdione-containing resin, a neutralized polyol and a tertiary amine catalyst, and optionally, an additive package selected from the group consisting of flow control additives, pigments (colorants), wetting agents, and solvents, wherein the first isocyanate and the second isocyanate are different. The first isocyanate-based uretdione-containing resin and the second isocyanate-based uretdione-containing resin may be cold blended or hot blended. Coatings, adhesives, castings, composites, and sealants made from hot blended formulations exhibit superior performance over those made from cold blended formulations.

Abstract: Application of a Mannich base in a flame-retardant polyurethane material is provided. The Mannich base has a structure represented by a formula (I). In the Mannich base, flame-retardant groups, i.e., halogens are introduced at the second, fourth and sixth positions of a phenyl group, and flame-retardant elements, i.e., halogens and nitrogen are introduced into synthesized polyether polyol, giving the synthesized polyether polyol good flame retardance. The amount of active hydrogen in the Mannich base is small so that occurrence of side reactions during the synthesis of the polyether polyol is reduced, and the viscosity of the flame-retardant polyether polyol is lowered. Due to autocatalytic performance of tertiary amido in the flame-retardant polyether polyol, use of a catalyst can be reduced and even avoided during the synthesis. A preparation method of the Mannich base is also provided.

Abstract: This disclosure relates generally to a moisture curable composition. The composition includes a first, crosslinkable copolymer having a plurality of silyl alkoxy terminal groups and a backbone that is the reaction product of a diisocyanate and a mixture of a low molecular weight polyether polyol and a high molecular weight polyether polyol; a second crosslinkable oligomer having a plurality of silyl alkoxy terminal groups and a backbone that is the reaction product of a diisocyanate and a low molecular weight polyether polyol; and a third crosslinkable oligomer having a plurality of silyl alkoxy terminal groups and a backbone that is the reaction product of a diisocyanate and a high molecular weight polyether polyol.

Abstract: A process for producing thermoplastic polyoxazolidinone, comprising the following steps: (i) Reaction of a diisocyanate compound (A) with a bisepoxide compound (B) in the presence of a catalyst (C) and a compound (D) in a solvent (E) forming an intermediate compound (F) and (ii) Reaction of a compound (G) with the intermediate (F) formed in step (i), wherein the bisepoxide compound (B) comprises isosorbide diglycidylether, wherein compound (D) is one or more compounds selected from the group consisting of monofunctional isocyanate and monofunctional epoxide, and wherein compound (G) is an alkylene oxide. The invention is also related to the resulting thermoplastic polyoxazolidinone.

Abstract: A polyurethaneurea composition comprises a reaction product of at least one diisocyanate compound, a polymeric glycol, a poly(tetramethylene-co-ethyleneether) glycol comprising constituent units derived by copolymerizing tetrahydrofuran and ethylene oxide (EO) wherein the portion of the constituent units derived from ethylene oxide is present in the poly(tetramethylene-co-ethyleneether) glycol from greater than about 37 to about 70 mole percent, at least one diamine chain extender, and at least one chain terminator. The invention further relates to the use of blends of polymeric glycols and poly(tetramethylene-co-ethyleneether) glycols as the soft segment base in spandex compositions. The invention also relates to new polyurethane compositions comprising polymeric glycols and poly(tetramethylene-co-ethyleneether) glycols, and their use in spandex.

Abstract: The present invention is directed to a curable film-forming composition comprising: (a) a curing agent comprising reactive isocyanate functional groups; (b) a film-forming compound comprising functional groups reactive with the reactive isocyanate functional groups in (a); (c) a photo-latent catalyst; (d) a beta-diketone having a flash point higher than 60 C (140 F); and (e) a beta-diketone having a flash point lower than or equal to 60 C (140 F). The invention is further directed to methods of controlling the rate of cure and increasing the wet-edge time of a curable film-forming composition comprising an isocyanate functional curing agent, by adding to the curable film-forming composition a catalyst component comprising: (i) a photo-latent catalyst; (ii) a beta-diketone having a flash point higher than 60 C (140 F); and (iii) a beta-diketone having a flash point lower than or equal to 60 C (140 F).

Abstract: An object of the present invention is to provide a novel rotaxane and a production method of the same. The present invention provides a rotaxane polyurea having a cyclic molecule and a polyurea chain piercing through the cyclic molecule.

Abstract: The invention relates to a composition excellent in stability during storage and stability during utilization, and relates to a method of producing the composition. The composition includes a compound (A) represented by general formula (1) and a compound (B) represented by general formula (2), and includes 0.00002 to 0.2 parts by mass of the compound (B) with respect to 100 parts by mass of the compound (A), (R1—COO)n—R2—(NCO)m??(1) (R1—COO)n—R2—(R3—R1)m??(2) wherein in general formulae (1) and (2), R1 is an ethylenically unsaturated group having 2 to 7 carbon atoms; R2 is a (m+n)-valent hydrocarbon group having 1 to 7 carbon atoms and optionally contains an ether group; R1 and R2 in the general formula (1) are the same as R1 and R2 in the general formula (2); in general formula (2), R3 is —NHC(?O)—; and n and m each represent an integer of one or two.

Abstract: The polycarbodiimide composition is a reaction product of polyisocyanate having a primary isocyanate group with alcohol, wherein the alcohol contains at least one oxyethylene-containing alcohol containing an oxyethylene group, and at least one oxyethylene-noncontaining alcohol containing no oxyethylene group, the at least one oxyethylene-noncontaining alcohol has a solubility parameter of 11.20 (cal/cm3)1/2 or less.

Abstract: A viscoelastic material comprises a unique adhesive and cohesive thermoset viscoelastic polymer coated onto a flexible substrate. The polymer can be formed by curing an uncured polymer mix derived from a thermosetting reaction media of a carefully balanced ratio of isocyanate prepolymer, polyether diols, polyether triols and organic plasticizers. The viscoelastic material can exhibit viscoelastic, adhesive, cohesive, releasability, cleansability and antimicrobial properties. In some aspects, the viscoelastic material can be fabricated into a personal protective article. In one embodiment, the personal protective article is a footwear cover.

Abstract: A process for producing thermoplastic polyoxazolidinone, comprising the following steps: (i) Reaction of a diisocyanate compound (A) with a bisepoxide compound (B) in the presence of a catalyst (C) and a compound (D) in a solvent (E) forming an intermediate compound (F) and (ii) Reaction of a compound (G) with the intermediate (F) formed in step (i), wherein compound (D) is one or more compounds selected from the group consisting of monofunctional isocyanate and monofunctional epoxide, and wherein compound (G) is an alkylene oxide. The invention is also related to the resulting thermoplastic polyoxazolidinone.