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    • 13. 发明授权
    • Process for the production of molded products using internal mold
release agents
    • 使用内部脱模剂生产成型产品的方法
    • US5529739A
    • 1996-06-25
    • US339854
    • 1994-11-15
    • Erik H. JonssonHarald PielartzikKristen L. ParksRandall C. Rains
    • Erik H. JonssonHarald PielartzikKristen L. ParksRandall C. Rains
    • B29C45/00B29C33/60B29C67/24B29K75/00B29C45/83
    • B29C67/246B29C33/60B29K2075/00
    • The present invention is directed to an improved internal mold release system for the production of high density molded SRIM parts, i.e. molded parts having a density of from 1.3 to 2.0 g/cc. In particular, the process involves reacting a reaction mixture comprising an organic polyisocyanate and at least one organic compound containing isocyanate-reactive hydrogens in the presence of a catalyst and an internal mold release agent in a closed mold. The internal mold release agent is a compound corresponding to the formula: ##STR1## wherein R.sup.2 represents hydrogen, the group R.sup.5 --NH--CO--, or a C.sub.1 to C.sub.24 alkyl or substituted alkyl group, a C.sub.3 to C.sub.24 cycloalkyl or substituted cycloalkyl group, a C.sub.2 to C.sub.24 alkenyl or substituted alkenyl group, or a C.sub.6 to C.sub.24 aryl or substituted aryl group, andwherein R.sup.1, R.sup.3, R.sup.4 and R.sup.5 may be the same or different and represent a C.sub.1 to C.sub.24 alkyl or substituted alkyl group, a C.sub.3 to C.sub.24 cycloalkyl or substituted cycloalkyl group, a C.sub.2 to C.sub.24 alkenyl or substituted alkenyl group, or a C.sub.6 to C.sub.24 aryl or substituted aryl group,with the proviso that at least one of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is a C.sub.12 to C.sub.24 alkyl or substituted alkyl group, or a C.sub.12 to C.sub.24 alkenyl or substituted alkenyl group, and with the further proviso that substituent groups are inert toward isocyanate groups at temperatures of 100.degree. C. or less.
    • 本发明涉及用于生产高密度模制SRIM部件的改进的内部脱模系统,即密度为1.3-2.0g / cc的模塑部件。 特别地,该方法包括使反应混合物包含有机多异氰酸酯和至少一种含有异氰酸酯反应性氢的有机化合物在催化剂和内部脱模剂存在下在封闭模具中反应。 内部脱模剂是对应于下式的化合物:其中R 2表示氢,R5-NH-CO-或C 1至C 24烷基或取代的烷基,C 3至C 24环烷基或取代的环烷基 C2-C24烯基或取代烯基,或C6-C24芳基或取代芳基,其中R1,R3,R4和R5可以相同或不同,表示C1至C24烷基或取代的烷基, C 3至C 24环烷基或取代的环烷基,C 2至C 24烯基或取代的烯基或C 6至C 24芳基或取代的芳基,条件是R 1,R 2,R 3,R 4和R 5中的至少一个为C 12 C 24烷基或取代的烷基,或C 12〜C 24链烯基或取代的链烯基,进一步的条件是取代基在100℃或更低的温度下对异氰酸酯基团是惰性的。