Production of foam sheets of high compressive strength
AssigneeBASF SE
InventorsHeinz Voelker, Gerhard Alicke, Horst Schuch, Manfred Weilbacher, Reinhold Weber
Life of this patent
Estimating the term…
Abstract
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 containing a) 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 and c) 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.
Claims10
A process for the production of foam sheets of high compressive strength and a cross-sectional area of at least 50 cm.sup.2 which comprises extruding a mixture of a styrene polymer, from 5 to 16% by weight, based on the styrene polymer, of a blowing agent, wherein the blowing agent used is a mixture containing
- a) 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 and
- c) 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.
Dependencies are inferred from the claim text.