Abstract:
The invention relates to (co)polycarbonate compositions and moulding compounds, characterised by improved rheological properties and a high heat deflection temperature.
Abstract:
The present invention relates to a coating composition comprising: a) one or more aliphatic polymer precursors selected from components A.1 and optionally A.2: A.1) aliphatic oligomers containing urethane or ester bonds and having at least two acrylate functions per molecule, or mixtures of said oligomers, and A.2) aliphatic reactive diluents having at least two acrylate groups per molecule, or mixtures of said reactive diluents, b) optionally one or more finely divided inorganic compounds, c) an organic UV absorber, d) optionally a free radical scavenger from the HALS class, e) optionally one or more levelling additives, f) optionally one or more solvents, and g) a photoinitiator. It further relates to a process for the coating of a substrate, to the coated substrates obtainable in this way, and to the use of the coated substrates.UV absorbers C) are those of formulae (Ia) and (Ib): and B—X—O—C(═O)—C(R)═CH2 (formula Ib) whereB is:
Abstract:
The invention relates to a method for producing compositions containing vinylaromatic copolymers which are obtained in an emulsion polymerization process and comprise production-related salt inclusions. Said compositions are characterized by an improved surface quality once the extruded polymer, before being granulated, or the granulate, after being granulated, has been moistened by bringing the polymer in contact with liquid water in a water bath, a tube system filled with water, or a dipping tank, thus making the compositions suitable for producing molded articles having a class A surface that remains flawless over time.
Abstract:
The invention relates to a method for producing flexible moulded polyurethane foams (flexible moulded PU foams) with horizontally disposed zones of different hardness, the method being implemented in such a way that at least two fluid reaction mixtures, forming foams with different hardnesses, are introduced in succession in horizontal disposition, in layer form, into the moulding cavity, with at least one fluid reaction mixture being freely foamed, before at least one further foam-forming fluid reaction mixture is introduced into the moulding cavity.
Abstract:
[Problem] In a coating method of a two-coat one-bake system where a clear coat paint is coated after a base coat paint is coated, then these two coated layers are simultaneously hardened, adhesive strength between the two coated layers is to increase in comparison with the conventional method.[Solution] Provided is a coating method; A specific hardener is used in the clear coat paint. The hardener is one containing a polyisocyanate derived from 1,6-hexamethylene diisocyanate, satisfying all the following conditions: 1) Hardener does not virtually include diisocyanate monomer, 2) Viscosity of hardener is not more than 1000 mPa·s/23° C., 3) Content of HDI trimer in hardener is not less than 60 weight %, and 4) Content of HDI dimer in hardener is less than 10 weight %.
Abstract:
The present invention relates to a process for producing flexible polyurethane (PUR) foams with high comfort value and low hysteresis losses produced by reacting organic polyisocyanates containing di- and polyisocyanates of the diphenylmethane (MDI) group with polyoxyalkylene polyethers.
Abstract:
The present invention relates to a polyurethane exclusively composed of a polyisocyanate component and of a polyol component, where the polyisocyanate component consists of one or more polyisocyanates and the average NCO functionality per molecule of the polyisocyanate component is ≧3, and the polyol component consists of one or more polyols and the average OH functionality per molecule of the polyol component is ≧3 and its OH content is ≧25% by weight. The invention further relates to a process for the production of the polyurethane of the invention, to an optical element comprising or consisting of a polyurethane of the invention, and also to the use of a polyurethane of the invention for conducting light, scattering light and/or deflecting
Abstract:
The invention relates to a reaction system for producing PUR and PIR hard foam materials, comprising the following components: A) a compound which is reactive towards isocyanates; B1) a surfactant component; C) a propellant in a supercritical or near-critical state; D) a polyisocyanate; and E) a layer silicate. The invention further relates to a reaction system for producing PUR and PIR hard foam materials, comprising the following components: B2) a surfactant component with functional groups which are reactive towards isocyanates; C) a propellant in a supercritical or near-critical state; D) a polyisocyanate; and E) a layer silicate. The invention further relates to a method for producing PUR and PIR hard foam materials and to PUR and PIR hard foam materials which can be obtained from the aforementioned reaction systems.
Abstract:
The invention relates to a process for preparing compounds containing isocyanate groups and cyclic carbonate structures, by reacting at least A) a monomeric diisocyanate with aliphatically, cycloaliphatically, araliphatically and/or aromatically bonded isocyanate groups with B) a hydroxy-functional cyclic carbonate, characterized in that component A) is reacted with component B) in an equivalents ratio of isocyanate groups to hydroxyl groups of at least 8:1. The invention further relates to the products obtainable by the process according to the invention, and to a composition comprising compounds containing isocyanate groups and cyclic carbonate structures. The invention additionally relates to the use of the products obtainable by the process according to the invention and of the composition as a starting component in the preparation of polyurethanes containing cyclic carbonate structures, crosslinkable binders, and also raw materials for coatings, sealants or adhesives.
Abstract:
The present invention relates to a security document and/or document of value with a hologram in a visually changeable window as a novel security element, and also to a method for producing the same.