Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a homogeneously colored bead- shaped expandable styrene polymer (EPS beads) in a simple method. SOLUTION: Colored expandable styrene polymer beads are obtained by polymerizing styrene in an aqueous suspension in the presence of a coloring pigment or a dye, if needed, with
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing an industrially extremely useful foamable polyolefin bead at a low cost, obtainable as a high-density non-foamed bead advantageous for transportation and preservation, exceeding 450 g/L. SOLUTION: A propylene polymer, a volatile organic blowing agent, a fine particle of a nucleating agent and optionally another conventional additive are melted and compounded in an extruder. The molten mixture is extruded into a water bath at
Abstract:
PROBLEM TO BE SOLVED: To obtain an expandable styrene polymer containing a foaming agent and a specific foaming auxiliary and exhibiting an improved expandable characteristic without affecting other treating characteristics and product characteristics. SOLUTION: This expandable styrene polymer contains a foaming agent and 0.5-20wt.% of a foaming auxiliary. Therein, the foaming auxiliary comprises a 2-20C aliphatic olefin oligomer which is liquid at room temperature and has a number - average polymerization degree of 2-200, preferably 2-100, and plural terminal double bonds, such as propene oligomer or isobutene oligomer.
Abstract:
PROBLEM TO BE SOLVED: To produce the subject foam having lowered thermal conductivity and good handleability, etc., and useful as an insulation material for composite element, etc., by adding graphite to an organic polyisocyanate, etc., and a compound having reactive hydrogen atom and reacting the mixture in the presence of a foaming agent, etc. SOLUTION: The objective foam useful for filling the hollow space of a refrigeration apparatus or a heating element is produced by reacting (A) an organic polyisocyanate and/or a modified organic polyisocyanate (e.g. diphenylmethane diisocyanate) with (B) one or more kinds of compounds having >=2 reactive hydrogen atoms (e.g. polyether polyol) in the presence of (C) a foaming agent, (D) a catalyst and optionally (E) an assistant and/or an additive. In the above reaction, preferably 1-10 wt.% (based on the whole foam) of graphite is added to the component A and/or B. Preferably, >=50% of the graphite has particle diameter of
Abstract:
PROBLEM TO BE SOLVED: To provide an expandable rubber-modified styrene polymer showing improved elasticity recovery, by incorporating a low-boiling blowing agent in a polymer mixture comprising a continuous phase of a styrene copolymer and rubber particles dispersed therein and comprising a butadiene/styrene block copolymer, and having a lamella structure free from polystyrene. SOLUTION: The expandable styrene polymer contains desirably 85-93 wt.% polystyrene or styrene copolymer (containing up to 50 wt.%, desirably up to 80 wt.% comonomer). The polystyrene contains a small amount (0.005-0.05 mol based on the styrene) of a crosslinking agent to be copolymerized. The expandable styrene polymer is desirably one containing 5-30 wt.% butadiene/styrene block copolymer in the polymer mixture and dispersed in the polystyrene phase in the form of particles. The ratio of the average length 1 of the rubber particles to the average thickness d is desirably above 5/1. The mixture contains 2-15 pts.wt., based on the composition, low-boiling blowing agent.
Abstract:
Die Erfindung betrifft unter Verwendung halogenfreier Treibmittel hergestellte, extrudierte Schaumstoffplatten aus einer Polystyrol-Thermoplastmatrix und geschlossenen Zellen, die frei von halogenhaltigen Gasen sind. Das Polystyrol der Thermoplastmatrix weist ein mittleres Molekulargewicht zwischen 175 000 und 500 000 mit einer Uneinheitlichkeit M w :M n von größer als 1,5 auf. Die Platten sind mindestens 20 mm, vorzugsweise mehr als 50 mm und insbesondere 80 bis 200 mm dick. Bevorzugte Treibmittel zur Herstellung der Schaumstoffplatten sind Kohlendioxid allein, sowie Mischungen aus Kohlendioxid und Ethanol und/oder Dimethylether.
Abstract:
Die Erfindung betrifft Schaumstoffplatten auf Basis von Styrolpolymerisaten, die 1 bis 10 Gew.-% Flammruß mit einer Teilchengröße von 70 bis 150 nm enthalten und den Brandtest B2 (nach DIN 4102) bestehen.
Abstract:
Verfahren zur Herstellung von perlförmigen expandierbaren Styrolpolymerisaten durch Polymerisation von Styrol, gegebenenfalls unter Mitverwendung weiterer Comonomerer, in wäßriger Suspension in Gegenwart von Suspensionsstabilisatoren und üblicher styrollöslicher Polymerisationskatalysatoren und unter Zusatz eines Treibmittels und 0,01 bis 1 Gew.% eines Polyolefins, welches 1 bis 20 Gew.% Carboxylgruppen enthält.
Abstract:
Die Erfindung betrifft flammgeschützte Schaumstoffplatten auf Basis von Styrolpolymerisaten, die als Flammschutzmittel mindestens 12 Gew.-% einer Mischung aus mindestens einem wasserabspaltenden Metallhydroxid und mindestens einer Phosphorverbindung enthalten.
Abstract:
Procedimiento para la obtención de partículas expandibles de poliolefina a partir de una poliolefina, de un agente de nucleación y de un agente propulsor, caracterizado porque a) se mezcla la poliolefina con el agente de nucleación en una extrusora y la poliolefina obtenida se enfría hasta solidificación, b) la poliolefina enfriada se recuece calentándose hasta una temperatura situada en el intervalo desde 100 hasta 200ºC y a continuación se enfría de nuevo por debajo de 100ºC, y c) la poliolefina obtenida se impregna, por debajo de 100ºC, con el agente propulsor, granulándose la poliolefina al final de la etapa a) o b).