Abstract:
PROBLEM TO BE SOLVED: To produce a foaming material comprising an aromatic polyester and a polyester blend, foamable by a stable foaming process and containing fine and uniform closed cells. SOLUTION: A chain-extending concentrate is used in production of the foaming material comprising the aromatic polyester and the polyester blend. The chain-extending concentrate comprises an ethylene-acrylate copolymer, a high-temperature thermoplastic resin and a multifunctional compound. The preparation process consists of two steps; (1) mixing and melt blending of the multifunctional compound and the HT thermoplastic resin into a matrix of the ethylene-acrylate copolymer in a closed-type mixer and (2) extrusion of the mixture at a temperature below the melting point or reaction temperature of the multifunctional compound. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a foamed cellular material having high-temperature resistance and rigidity, but is flexible and has a low density. SOLUTION: The foamed cellular material having high-temperature resistance and rigidity, but is flexible and has a low density comprises a polyester blend including about 80-about 98 wt.% high viscosity polyethylene terephthalate (intrinsic viscosity=1.0-1.9 dl/g), about 2-about 20 wt.%, preferably about 5 wt.% polycarbonate having an average molecular weight higher than 4,000 g/mol. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
En esta invención, se describe la composición y la preparación de un concentrado extensor de cadena para la producción de materiales celulares espumados de poliésteres aromáticos. El concentrado extensor de cadena está comprendido por un copolímero de etileno-acrilato, un termoplástico de alta temperatura y un compuesto multifuncional. El proceso de preparación consiste de dos pasos: 1) Mezclar y combinar en estado fundido el compuesto multifuncional y la resma termoplástica de HT en la matriz del copolímero de etileno-acrilato en un mezclador interno y; 2) extruir la mezcla a una temperatura por debajo del punto de fusión o temperatura de reacción del compuesto multifuncional.
Abstract:
La presente invención se refiere a material celular espumoso de baja densidad, resistente a temperaturas altas, rígido, pero flexible comprendido de mezcla de poliéster que consiste desde 80 hasta 98 por ciento por peso de tereftalato de polietileno de alta viscosidad (I.V.=O.1-l.9 dl/g) y desde aproximadamente 2 hasta 20, preferiblemente hasta 5, por ciento por peso de policarbonato con MW promedio más alto que 4000 g/mol.
Abstract:
The foam tube for pipe insulations has an external surface and an internal surface. The internal surface is provided with an adhesively bonded layer of fibers. The fibers are a material having a melt temperature that is higher than that of the polymeric foam. The fibers are adhesively bonded to the internal surface such as to stand up from the internal surface. The fibers are substantially uniformly distributed over the internal surface providing a surface coverage of 2 to 20 percent. Further, the fibers have a linear density of 0.5 to 25 dtex and a length of 0.2 to 5 mm. With this fiber layer the polymeric foam tube has an improved thermal resistance and thermal conductivity.
Abstract:
The foam tube for pipe insulations has an external surface and an internal surface. The internal surface is provided with an adhesively bonded layer of fibers. The fibers are a material having a melt temperature that is higher than that of the polymeric foam. The fibers are adhesively bonded to the internal surface such as to stand up from the internal surface. The fibers are substantially uniformly distributed over the internal surface providing a surface coverage of 2 to 20 percent. Further, the fibers have a linear density of 0.5 to 25 dtex and a length of 0.2 to 5 mm. With this fiber layer the polymeric foam tube has an improved thermal resistance and thermal conductivity.
Abstract:
The foam tube for pipe insulations has an external surface and an internal surface. The internal surface is provided with an adhesively bonded layer of fibers. The fibers are a material having a melt temperature that is higher than that of the polymeric foam. The fibers are adhesively bonded to the internal surface such as to stand up from the internal surface. The fibers are substantially uniformly distributed over the internal surface providing a surface coverage of 2 to 20 percent. Further, the fibers have a linear density of 0.5 to 25 dtex and a length of 0.2 to 5 mm. With this fiber layer the polymeric foam tube has an improved thermal resistance and thermal conductivity.
Abstract:
Material de poliéster expandido dúctil, rígido y altamente resistente a los impactos que comprende unacombinación de poliéster/elastómero acrílico consistente en un mínimo de un 2% en peso de uno o máscopolímeros de acrilato con un contenido en acrilato del 3 al 50% en peso con respecto al copolímero deacrilato y un índice de flujo en fusión de 0,1 a 200 g/10 min a 190ºC/2,16 kg, teniendo el material de poliésteruna elongación antes de rotura por cizalladura superior al 15% (de acuerdo con ISO 1922) y un aceleraciónmáxima g-max inferior a 93 y unos criterios de lesión de cabeza HIC menores de 316 (de acuerdo con ASTMF1292), consistiendo el copolímero de acrilato en una mezcla de una resina de acrilato de etileno no reactiva yuna resina de acrilato de etileno reactiva y obteniéndose el material de poliéster expandido mediantecombinación en fusión del copolímero de acrilato con el poliéster, dispersión de la combinación con uncompuesto multifuncional, un agente de soplado y un agente de nucleación, y expansión de la mezcla,caracterizado por una descompresión inducida por un cambio en el estado termodinámico, a saber por presióno temperatura, o por una deformación, alargamiento o estiramiento uniaxial o biaxial de la mezcla fundida.
Abstract:
The present invention relates to an easy-to-apply, but versatile method for modifying the physical and chemical resistance properties of expanded polyester products, such as fire retardancy and hydrolysis resistance, by melt-modification of the surface layer(s) of said foams and sponges, the manufacturing of such products and the use of such products.