摘要:
The invention relates to a controlled polymerization process for preparing (meth)acrylate-based AB diblock copolymers with a B block which has a narrow monomodal molecular weight distribution, and an A block which has a broad bimodal molecular weight distribution, and to the use thereof, for example, as a binder in adhesives or sealants.
摘要:
The present invention comprises a novel formulation for marking trafficways, for example roads, which when compared with the prior art have improved mechanical properties and improved heat resistance during curing. The invention also relates to improved reactive resins for other applications than roadmarkings. The present invention in particular relates to reactive resins which comprise core-shell particles.
摘要:
The present invention relates to a concentrator for focusing solar radiation, having surface structuring in the form of one or more Fresnel lenses on the lower side, and to the production thereof from polymeric materials by means of a specific extrusion process. The inventive concentrator can be employed in plants utilizable for photovoltaic or solar heating purposes, and has the required durability and performance in demanding climatic zones. The inventive concentrator enables particularly economic production and efficient concentration of solar radiation onto objects such as solar cells or absorber units, irrespective of the geometry thereof. The inventive concentrator has high longevity and-combined with this-high optical performance when employed in extreme and demanding climatic zones. This relates, for example, to the area of a high-performance solar cell used in concentrating photovoltaics, and likewise to an absorber tube which finds use in concentrating solar thermal collector, for example in the context of parabolic trough technology.
摘要:
The invention relates to a process for producing poly(meth)acrylimide foams and also blocks, sheets and the like composed of such poly(meth)acrylimide foams and also the intermediate articles formed from the copolymer of (meth)acrylic acid and (meth)acrylonitrile, which are all distinguished by a particularly low residual monomer content.
摘要:
The invention relates to a process for production of methacrylic acid, to a process for production of methyl methacrylate comprising the process steps a) providing a feed composition comprising at least one C 4 feed compound selected from isobutylene and tertiary butanol; b) providing methanol; c) subjecting the at least one C4 feed compound and the methanol to a first catalytic reaction zone to obtain a reaction phase comprising methyl tertiary butyl ether; d) separating at least a first part of methanol from the reaction phase to obtain a first methanol phase and a reaction phase depleted in methanol; e) subjecting at least one of the reaction phase and the reaction phase depleted in methanol to a second catalytic reaction zone to obtain a splitting phase comprising isobutylene and methanol; f) optionally separating at least a first part of isobutylene from the second reaction phase to obtain a first isobutylene phase and a splitting phase depleted in isobutylene; g) optionally subjecting the first isobutylene phase to a first purification zone; h) subjecting the optionally purified first isobutylene phase to a third catalytic reaction zone to obtain an oxidation phase comprising at least one C 4 oxidation product selected from methacrolein and methacrylic acid; i) optionally subjecting the oxidation phase to a second purification zone; j) subjecting the optionally purified oxidation phase to a fourth catalytic reaction zone to obtain an esterification phase comprising methyl methacrylate; k) optionally subjecting the esterification phase to a third purification zone, to an apparatus for production of methacrylic acid, to an apparatus for production of methyl methacrylate, to a process carried out in the apparatus, to methacrylic acid, to methyl methacrylate, to methacrylate esters, to a process for preparation of a polymer comprising at least one methacrylic acid, methyl methacrylate and/or methacrylate ester monomer unit, to a polymer comprising at least one methacrylic acid, methyl methacrylate and/or methacrylate ester monomer, to a process for preparation of a composition, to a composition, to chemical products, and to the use of at least one of methacrylic acid, methyl methacrylate, methacrylate ester, a polymer and/or a composition in chemical products.
摘要:
The invention relates to a moulding composition, comprising a) 50 to 99.9% by weight of a matrix composed of a thermoplastic polymer and b) from 0.1 to 50% by weight of a matting agent in the form of a (meth)acrylate copolymer dispersed in the matrix, characterized in that the matting agent is a (meth)acrylate copolymer which has been prepared from the following monomers, b1) from 50 to 95% by weight of methyl methacrylate b2) from 5 to 50% by weight of C1-C6-alkyl acrylates b3) from 0.01 to less than 0.5% by weight of a crosslinking monomer and/or graft-linking agent having two or more ethylenically unsaturated radicals capable of free-radical polymerization, b4) from 0 to 20% by weight of one or more other, non-crosslinking ethylenically unsaturated monomers capable of free-radical polymerization, where the entirety of the constituents b1) and b2) and, where appropriate, b3) and/or b4) gives 100% by weight, and the glass transition temperature Tmg of the matting agent is at least 20° C.
摘要:
The invention relates to a laminate comprising at least one thermoplastic substrate and at least one color layer. The thermoplastic substrate comprises polyamide, and at least one color layer with a crosslinked polyurethane is applied onto said substrate.