Process for heat sealing polyurethane foam

Details Process for heat sealing polyurethane foam Process for heat sealing polyurethane foam

B - Operations, Transporting

29

D

18/669, 154/90.3

B29D 27/00 (1980.01)

Patent

CA 1152274

Mo-1924 PU-091 PROCESS FOR HEAT SEALING POLYURETHANE FOAM ABSTRACT OF THE DISCLOSURE The instant invention is directed to a process for heat sealing flexible polyurethane foam, comprising: A. reacting and foaming a polyurethane foam produced by the steps comprising reacting: (I) an organic polyisocyanate; (II) a polyol having a molecular weight of 2,000 to 8,000 comprising the adduct obtained by sequentially reacting: (a) a polyhydroxyl initiator, with a functionality of 2 to 5 and a weight average molecular weight as deter- mined by gel permeation chromatography of from 62 to 200; with (b) 0 to 90%, preferably 10 to 90%, most preferably 10 to 50%, by weight, based on the total oxide present in (b) + (c) + (d), a first alkylene oxide; and subsequently reacting the product with (c) 10 to 80%, preferably 20 to 50% by weight, based on the total oxide present in (b) + (c) + (d), 4,4,4- trichloro-1,2-epoxybutane and/or epihalohydrin; and subsequently reacting the product with (d) 0 to 60%, preferably 10 to 60%, most preferably 10 to 40%, by weight, based Mo-1924 on the total oxide present in (b) + (c) + (d), a second alkylene oxide. (III) foaming agent; and optionally (IV) catalyst; B. heating a portion of the surface of said flexible polyurethane foam of (A) above its melting or fusion point; and C. cooling said flexible polyurethane foam below its melting or fusion point. Mo-1924

344259

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