Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1986-11-06
1988-11-08
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
252 34, 252 36, 264 455, 264338, 264DIG83, B29C 6722, B29C 3936
Patent
active
047832967
ABSTRACT:
A process for producing polyurethane foam articles is described, in which the article is produced in the conventional manner by foaming in a mould and a release agent is applied to the mould surface prior to filling with the foam-producing components. According to the invention, a solvent-free, aqueous release agent is used in combination with one or more alkali metal and/or ammonium salts of higher fatty acids and one or more higher alcohols and the combination is applied in the hot state, preferably at a temperature of at least 75.degree. C. to the mould surface. In addition, an additive is described, which is suitable for performing the process according to the invention and contains one or more alkali metal and/or ammonium salts of higher fatty acids, one or more higher alcohols and otherwise water. The process according to the invention has the advantage that it not only avoids the use of environmentally prejudicial organic solvents, but also leads to excellent release agent films, from which the water is very largely evaporated within a very short time and namely within the very short cycle times of modern foam plants.
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Update: Additives that provide mold release, Plastics Compounding, Mar./Apr. 1983.
European Patent Office Search Report.
Fischer Wolfgang
Hattich Thomas
Krug William
Schuster Gerhard
Anderson Philip
Baker William L.
Newland Bart G.
Teroson GmbH
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