MOLDED FOAM ARTICLES PREPARED WITH REDUCED MOLD RESIDENCE TIME AND IMPROVED QUALITY

Foamed molded articles, produced by reaction injection molding (RIM), are provided. The molded articles are formed by reaction of a polyisocyanate component with an isocyanate reactive component in a mold, using a blowing agent. The molded articles are preferably composites, formed in the presence o...

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Bibliographische Detailangaben
Hauptverfasser:	GILLIS, HERBERT, R, BAREIS, DAVID, W, SHIDAKER, TRENT, A
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Foamed molded articles, produced by reaction injection molding (RIM), are provided. The molded articles are formed by reaction of a polyisocyanate component with an isocyanate reactive component in a mold, using a blowing agent. The molded articles are preferably composites, formed in the presence of a fibrous reinforcing material. The foamed articles are characterized by relatively short minimum mold residence times, and can thereby be produced more economically than prior art composites. The foamed articles are further characterized by a reduction in physical defects, such as splits and voids. La présente invention concerne des articles moulés expansés, fabriqués par réaction et moulage par injection (R.M.I). Lesdits articles moulés sont formés en faisant réagir un composant polyisocyanate avec un composant réactif isocyanate dans un moule, au moyen d'un agent d'expansion. Les articles moulés sont de préférence des composites, formés en présence d'une matière de renforcement fibreuse. Les articles expansés sont caractérisés par des temps de séjour en moule relativement courts et peuvent ainsi être produits de manière plus économique que les composites antérieurs. Les articles expansés sont, de plus, caractérisés par une réduction des défauts physiques, tels que les fissures et les vides.