Mixing and casting lactam compositions
Abstract
Abstract IN CASTING MOLTEN MONOMERIC LACTAMS TO FORM SOLID POLLACTAM OBJECTS, SEARATE STREAMS OF A CATALYST-CONTAINING LACTAM COMPOSITION AND PROMOTER-CONTAINING LACTAM COMPOSITION, RESPECTIVELY, ARE FORCED THROUGH CHANNELS, ONE LACTAM STREAM BEING LATERALLY INTRODUCED INTO THE OTHER AT AN ANGLE OF ABOUT 90* AND WITH A MASSVELOCITY ABOUT 2.5 TO 3 TIMES THE MASS-VELOCITY OF THE OTHER LACTAM STREAM. THE RESULTING UNIFORM MIXTURE IS PASSED TO A MOLD CAVITY FOR POLYMERIZATION AND SHAPING, AND UPON COMPLETION THE MOLD IS OPENED AND THE SOLID ARTICLE REMOVED. IN A MULTIPART CASTING MOLD, ONE PART IS A MOLD BLOCK AND THE OTHER A COVER PLATE. TWO SEPARATE CHANNELS IN THE MOLD BLOCK, WHICH CONVEY SEPARATE STREAMS OF LACTAM CONTAINING CATALYST AND LACTAM CONTAINING PROMOTER, RESPECTIVELY, MEET AT AN ANGLE OF ABOUT 90*, THE CROSS SECTION OF THE SIDE-ENTERING CHANNEL IS OF SUCH A PREDETERMINED SIZE THAT THE MASS-VELOCITY OF THE MONOMER STREAM ISSUING OUT OF SAID CHANNEL IS 2.5 TO 3 TIMES THE MASS-VELOCITY OF THE OTHER MONOMER STREAM, AND A COMMON CHANNEL CONVEYS THE MIXTURE TO THE MOLD CAVITY.
Inventors
- 👤 Robert S Heckrotte
Bibliographic Details
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