B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/668
B29C 44/06 (2006.01) B29B 7/74 (2006.01) B29B 7/76 (2006.01)
Patent
CA 1061969
ABSTRACT In the manufacture of insulating and lightweight construction materials, which can contain fillers, and which were produced by physical foaming; the addition of fillers has involved difficulties. This arises because materials having relatively rough surfaces, as with most fillers, accelerate the collapse of liquid foams so greatly, that the addition of fillers was a problem in the case of physically foamed resins. The process of this invention increases the stability of reaction resin foams and conden- sation resin foams, so that the foam can be mixed with curing agents and accelerators, as well as lightweight fillers, and if appropriate, heavier fillers. The process involves contacting a thin film of the liquid resin, in a pressure vessel, with a blowing agent, causing the liquid resin to flow, without absorbing bubbles of the agent, down an elongated surface. The liquid resin film absorbs the agent so rapidly, that the flowing film can be immediately withdrawn from the vessel, and allowed to expand and cure into a foamed resin.
233707
Bovender Franz
Goerden Leonhard
Gromping Franz
Kloker Werner
Niesel Harald
Aktiengesellschaft Bayer
Na
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