公开(公告)号：US3578640A

公开(公告)日：1971-05-11

申请号：US3578640D

申请日：1968-03-07

Applicant: ALLIED CHEM

Inventor： TWILLERY IAN C ,  COLI GUIDO JOHN JR ,  ROTH DAVID W H JR

IPC: C08G69/00 ,  C08G69/16 ,  C08G69/46 ,  D01F6/60 ,  C08G20/14

CPC classification number: C08G69/46 ,  C08G69/16 ,  D01F1/10 ,  D01F6/60

Abstract: SHAPED ARTICLES SUCH AS FILAMENTS ARE PRODUCED FROM POLYCAPROAMIDE IN A CONTINUOUS PROCESS WHICH COMPRISES EXTRUDING A NASCENT MOLTEN POLYMER HAVING LESS THAN ABOUT 12 MEQ./KG. OF MINOR SPECIES OF UNREACTED END GROUPS AND LESS THAN 2.5 PERCENT BY WEIGHT WATER EXTRACTABLES FOLLOWING POLYMERIZATION. THE MOLTEN POLYMER IS KEPT SUBSTANTIALLY ANHYDROUS AND MAINTAINED UNDER SHEAR IN A FILLED SYSTEM UNTIL EXTRUDED TO FORM A PRODUCT. THIS PROCESS EFFECTIVELY INHIBITS THE REGENERATION OF MONOMER IN THE POLYMER AND STABILIZES THE MOLECULAR WEIGHT THEREOF AFTER POLYMERIZATION THEREBY IMPROVING THE QUALITY OF THE PRODUCTS PRODUCED FROM THE POLYMER MELT PREPARED IN ACCORDANCE WITH THE PRESENT INVENTION.

公开(公告)号：US3558567A

公开(公告)日：1971-01-26

申请号：US3558567D

申请日：1967-12-28

Applicant: ALLIED CHEM

Inventor： TWILLEY IAN C ,  ROTH DAVID W H JR ,  LOFQUIST ROBERT A

IPC: C08G69/16 ,  C08G20/00

CPC classification number: C08G69/16

Abstract: NYLON-6 HAVING A LOW CYCLIC OLIGOMER CONTENT IS PRODUCED BY HEATING A MIXTURE OF EPSILON-CAPROLACTAM AND WATER (TOGETHER WITH PROPERTY-MODIFYING ADDITIVES AND CHAIN-TERMINATING AGENTS, IF DESIRED) TO EFFECT REACTION OF EPSILON-CAPROLACTAM AT A RATE DETERMINED BY THE MAXIMUM CONCENTRATION OF CYCLIC OLIGMERS DESIRED IN THE PRODUCT, A SLOWER RATE RESULTING IN A LOWER CYCLIC OLIGOMER CONTENT. WHEN LESS THAN ABOUT 45% OF THE EPSILON-CAPROLACTAM IS REACTED AND THE MIXTURE HAS GONE THROUGH A MAXIMUM END GROUP CONCENTRATION, THE RATE OF POLYMERIZATION CAN BE INCREASED AND EVAPORATIVE CONDITIONS CAN BE APPLIED TO REMOVE WATER AND EXCESS MONOMER WITHOUT F URTHER INCREASING THE CONCENTRATION OF CYCLIC OLIGOMERS.

公开(公告)号：US3679368A

公开(公告)日：1972-07-25

申请号：US3679368D

申请日：1969-10-20

Applicant: ALLIED CHEM

Inventor： BALINT LASZLO J ,  ROTH DAVID W H JR ,  SNIDER ORVILL E

IPC: B01J19/18 ,  C08F2/00 ,  C08G18/08 ,  C08G63/78 ,  C08G69/04 ,  B01D1/22 ,  C08F1/98

CPC classification number: B01J19/1862 ,  B01J2219/00159 ,  B01J2219/00162 ,  B01J2219/00168 ,  C08G18/0895 ,  C08G63/785 ,  C08G69/04 ,  Y10S159/10 ,  Y10S159/36

Abstract: APPARATUS FOR CONTINUOUS ESTERIFICATION AND POLYCONDENSATION COMPRISING A RECTIFICATION UNIT HAVING A FEED OUTLET THEREFROM TO A MULTIPLE ZONE SUBSTANTIAL VERTICAL ESTERIFICATION MEANS CONTAINING AGITATORS AND WEIRS (WHEREIN SAID AGITATORS ARE CONICAL IN SHAPE) AND INTERPOSITIONED WITH RESPECT TO SAID WEIRS, AND DEVOLATILIZATION MEANS LOCATED BETWEEN SAID MULTIPLE ZONE ESTERIFICATION MEANS AND A PLUG FLOW MEANS.