摘要:
Process for the production of foam boards having a minimum thickness of 20 mm and a cross-sectional area of at least 50 cm.sup.2 by extruding a mixture of the styrene polymer, from 1 to 10% by weight, based on the styrene polymer, of a blowing agent, wherein the blowing agent contains at least one ether from the group consisting of dimethyl ether, methyl ethyl ether and methyl vinyl ether.
摘要:
Extruded foam boards produced using halogen-free blowing agents from a styrene polymer thermoplastic matrix having a Vicat softening temperature VST B 50 of at most 100.degree. and a melt index MVI 200/5 of at least 5 ml/10 min are at least 20 mm, preferably more than 50 mm and in particular from 80 to 200 mm, thick. Preferred blowing agents for producing the foam boards are carbon dioxide alone, as well as mixtures of carbon dioxide and ethanol and/or dimethyl ether.
摘要:
Foam boards of high compressive strength are produced by extruding a mixture of a styrene polymer and from 5 to 16% by weight of a blowing agent which containsa) from 3 to 70% by weight of an alcohol or ketone having a boiling point of from 56.degree. to 100.degree. C.,b) from 0 to 50% by weight of carbon dioxide,c) from 0 to 88% by weight of a saturated C.sub.3 - to C.sub.5 -hydrocarbon,d) from 2 to 90% by weight of at least one fluorinated hydrocarbon which has a boiling point of from -30 .degree. to +30.degree. C.
摘要:
Foam sheets of high heat distortion resistance contain a) from 80 to 99% by weight of a styrene polymer and b) from 1 to 20% by weight of poly-1,4-phenylene sulfide, and, if desired, conventional additives and are produced by extrusion using a low-boiling blowing agent.
摘要:
Foam sheets of high compressive strength are produced by extruding a mixture of a styrene polymer and from 5 to 16% by weight of a blowing agent mixture containinga) from 3 to 70% by weight of an alcohol or ketone having a boiling point of from 56.degree. to 100.degree. C.,b) from 5 to 50% by weight of carbon dioxide andc) from 0 to 90% by weight of a saturated C.sub.3 - to C.sub.5 -hydrocarbon and/or of a hydrogen-containing chlorofluorocarbon or fluorinated hydrocarbon boiling at from -30.degree. to +30.degree. C.
摘要:
Foam sheets of high heat distortion resistance contain a) from 80 to 99% by weight of a styrene polymer and b) from 1 to 20% by weight of poly(2,6-dimethyl-1,4-phenylene oxide), and, if desired, conventional additives and are produced by extrusion using a low-boiling blowing agent.
摘要:
Flame-retardant foam slabs are based on styrene polymers wherein from 1 to 12% by weight of expanded graphite and also, if desired, from 1 to 12% by weight of a phosphorus compound are present as flame retardants.
摘要:
Expandable styrene polymers containing recycled polystyrene have a content of recycled material of up to 40% by weight, based on the total weight of the polystyrene, wherein, in the course of the polymerization of the reaction mixture, from 100 to 500 ppm of a molecular weight regulator and/or from 0.05 to 1.0% by weight, based in each case on the polymerization solution, of a finely divided polyethylene wax are added.