Process for the production of back foamed internal parts for...

Details Process for the production of back foamed internal parts for... Process for the production of back foamed internal parts for...

B - Operations, Transporting

32

B

B32B 5/20 (2006.01) B29C 44/12 (2006.01) B32B 5/14 (2006.01) F25D 23/06 (2006.01)

Patent

CA 2041162

Mo-3553 LeA 27,681 A PROCESS FOR THE PRODUCTION OF BACK FOAMED INTERNAL PARTS FOR REFRIGERATION FURNITURE ABSTRACT OF THE DISCLOSURE Refrigeration units having internal parts containing a rigid polyurethane foam formed without the use of perhalo- genated fluoro-chlorohydrocarbons are produced by applying a coating to the internal walls of the part in which back-foaming will take place, pouring a foam forming reaction mixture into the cavity of the part in which the internal walls have been coated and allowing the foam to form and set. The coating applied to the internal walls of the part in which back foaming is to be carried out is selected from one-component chemically cross-linking lacquers, two-component chemically cross-linking lacquers and lacquers based on aqueous polyurethane dispersions. The foam forming mixture generally includes a polyisocyanate, a polyisocyanate-reactive compound and a blowing agent. The blowing agent must include a partially halogenated hydrocarbon having at least one carbon-hydrogen bond and a boiling point in the range of from about -50 to about 50°C.

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