Flexible und rückfedernde Schaumstoffe und Verfahren zu ihrer Herstellung

摘要

1303733 Moulding latex-olefin foam BADISCHE ANILIN- & SODA-FABRIK AG 29 May 1970 [31 May 1969] 25916/70 Heading B5A [Also in Division C3] A foamed plastics material is made by foaming a vulcanizable aqueous latex dispersion to from four to fifteen times the volume of the aqueous dispersion, mixing the foamed latex with expanded olefin polymer particles having a diameter of from 1 to 30 mm. and a bulk density of from 5 to 200 g/l., 0À5 to 10 parts by weight of foamed latex, based on the solids content of the latex, being used per part by weight of expanded olefin polymer particles, heating the mixture to from 70‹ to 150‹ C. in a mould, thereby vulcanizing the latex, and the combined expanded plastics moulding is then removed from the mould and dried to remove water. Examples of latex and polyolefin materials are given. The mixture of foamed latex and expanded olefin polymer particles may be compressed in a mould by from 5 to 20% of its original bulk volume prior to being heated to 70‹ to 150‹ C. The mould may be of aluminium and preheated and the compression may be carried out using a fine-meshed wire net. Alternatively the filled mould may be placed inside a second mould of slightly greater dimensions, and whose top and bottom walls are heated, and kept there for a period.