C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
403/32, 6/6, 400
C08G 18/66 (2006.01) B29C 33/60 (2006.01) C08G 18/28 (2006.01) C08G 18/34 (2006.01) C08G 18/65 (2006.01) C08K 5/09 (2006.01) C08K 5/17 (2006.01) C08K 5/3412 (2006.01)
Patent
CA 1276752
A PROCESS FOR THE PREPARATION OF CELLULAR/NONCELLULAR POLYURETHANE-POLYUREA MOLDED ARTICLES HAVING IMPROVED DEMOLDING PROPERTIES Abstract of the Disclosure The discovery concerns a process for the prepara- tion of cellular or noncellular polyurethane-polyurea molded articles having improved demolding properties through the reaction of a) an organic polyisocyanate, b) a higher molecular weight compound having at least two and, optionally, reactive hydrogen atoms, c) an aromatic diamine, and, optionally d) a chain extender, and/or crosslinker and e) an internal mold release agent, in the presence of f) a catalyst, and, optionally, g) a blowing agent, h) auxiliaries and/or additives by reaction injection molding technique in a closed mold, wherein said internal mold release agent (e) comprises A) 0.1 to 10 percent by weight, preferably 1 to 8 percent by weight, based on the entire weight of the structural components (b), (c), (d), a mixture comprising i) 5 to 80 parts by weight, preferably 30 to 70 parts by weight, of at least one organic amine and/or cyclic lactam, ii) 20 to 95 parts by weight, preferably 40 to 70 parts by weight, of at least one metal salt of stearic acid and/or isostearic acid, and iii) 0 to 5 parts by weight, preferably 0.01 to 1 part by weight, of a metal salt of an organic mono- and/or dicarboxylic acid, and B) 0.01 to 2 percent by weight, preferably 0.1 to 1.5 percent by weight based on the total weight of the component (b), (c), (d) of at least one organic mono- and/or dicarboxylic acid, or their anhydride. The internal mold release agents are used in the production of molded articles by polyisocyanate-addition polymerization in open or preferably closed, appropriate metal, heated molds using reaction injection techniques.
518426
Horn Peter
Marx Matthias
Schmidt Hans U.
Basf Aktiengesellschaft
Horn Peter
Marx Matthias
Robic Robic & Associes/associates
Schmidt Hans U.
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