Abstract:
One variation of a method for directly casting a thin layer onto a substrate includes: combining a prepolymer, a solvent, and a curing agent to define a viscous material; advancing a substrate from a roll across a surface continuously at a first speed; depositing the viscous material at a viscosity through a deposition head onto the substrate, the viscous material flowing laterally across the substrate to form a thin layer of substantially uniform thickness over the substrate over a period of time while the substrate advances along the surface; and, at a distance from the deposition head depositing the viscous material onto the substrate corresponding to a duration of time for the viscous material to flow laterally across the substrate, heating the viscous material to evaporate solvent and to induce reaction between the curing agent and the prepolymer to cure the viscous material to form a layer.
Abstract:
A composition having: an amine-functional compound and an alkoxysilane-terminated polyurea made by reacting: an amino-functional alkoxysilane-polyisocyanate adduct with a difunctional amino- or hydroxyl compound. The composition contains no unreacted isocyanate groups. A coating composition having: an amine-functional compound, an alkoxysilane-terminated polyurea, and an epoxy- or acrylate-functional compound. The coating composition is a two-component system.
Abstract:
The present invention relates to a process for producing flame-retardant porous materials comprising the following steps: (a) reacting at least one polyfunctional isocyanate (a1) and at least one polyfunctional aromatic amine (a2) in an organic solvent optionally in the presence of water as component (a3) and optionally in the presence of at least one catalyst (a5); and then (b) removing the organic solvent to obtain the organic porous material, where step (a) is carried out in the presence of at least one organic flame retardant as component (a4), where this flame retardant is soluble in the solvent. The invention further relates to the porous materials thus obtainable, and also to the use of the porous materials for thermal insulation.
Abstract:
The present invention is directed to curable, two-package compositions comprising a first and second reactive package. The first reactive package comprises: a) a polyamine component comprising: i) an aspartic ester functional polyamine; and ii) an aromatic polyamine; and b) a rheology modifier. The second reactive package comprises a polyisocyanate, and the curable composition, upon mixing of the reactive packages, demonstrates a gel time of at least 10 minutes.
Abstract:
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.
Abstract:
A polyol compound denoted by general formula (I). A transparent molded article obtained by polymerizing monomer components comprising the aforementioned polyol compound. A transparent molded article obtained by polymerizing monomer components comprising components (C) and (D). A method of manufacturing a transparent molded article, comprising casting a mixture of component (C) and component (D) into a casting mold and then polymerizing component (C) and component (D) to obtain a molded article.
Abstract:
A method of manufacturing an optical member by mixing isocyanate terminal prepolymer component (A) and aromatic diamine component (B), and immediately after mixing, casting a mixture into a casting mold to obtain a molded article. A method of manufacturing a plastic lens by mixing said components (A) and (B), immediately after mixing, casting a mixture into a casting mold and polymerizing it to obtain a molded article. A gasket for molding plastic lenses comprised of a cylindrical member. A casting mold for molding plastic lenses using this gasket and a monomer casting jig.
Abstract:
The present invention relates to a sulfur-containing polyureaurethane and a method of preparing the polyureaurethane. The sulfur-containing polyureaurethane has a refractive index of at least 1.57, an Abbe number of at least 32 and a density of less than 1.3 grams/cm3 when cured. The sulfur-containing polyureaurethane is prepared by the reaction of: (a) a sulfur-containing, isocyanate functional polyurethane prepolymer derived from: (i) a polyisocyanate; and (ii) a polythiol oligomer produced by the reaction of at least two or more different dienes with one or more dithiols and in certain embodiments at least one trifunctional or higher-functional polythiol; and (b) an amine-containing curing agent.
Abstract:
An isocyanate-reactive component is disclosed that reacts with a liquid polyisocyanate or polyisocyanate prepolymer in the preparation of a polyurethane-polyurea polymer. In one embodiment, a polyisocyanate component is reacted with an isocyanate-reactive component. The polyisocyanate component has an NCO group content of about 3% to about 50% and an average functionality of about 2 to about 3. The isocyanate-reactive component includes from about 20% to about 90% by weight, based on 100% by weight of the isocyanate-reactive component, of at least one organic compound having a mercaptan functional moiety.
Abstract:
The present invention relates to a sulfur-containing polyureaurethane and a method of preparing said polyureaurethane. In an embodiment, the sulfur-containing polyureaurethane adapted to have a refractive index of at least 1.57,an Abbe number of at least 32 and a density of less than 1.3 grams/cm3, when at least partially cured.