公开(公告)号：US3813366A

公开(公告)日：1974-05-28

申请号：US34359473

申请日：1973-03-21

Applicant: ALLIED CHEM

Inventor： WRIGHT W ,  BINGHAM A ,  FOX W

IPC: C08G69/00 ,  C08G69/16 ,  C08G20/14

CPC classification number: C08G69/16

Abstract: A COUPLED PROCESS FOR THE PRODUCTION OF POLYCAPROAMIDE SHAPED ARTICLES FROM MOLTEN ANHYDROUS NASCENT POLYMER IS DISCLOSED. THE IMPROVEMENT IS HYDROLYZING TO FORM PREPOLYMER BY CONTINUOUSLY MAINTANING A CAREFULLY CONTROLLED TEMPERATURE PROFILE, FROM TOP TO BOTTOM OF THE HYDROLYZER, FROM A TOP TEMPERATURE OF 200*C TO 240*C. AND A BOTTOM TEMPERATURE OF 245* TO 275*C. WITH NO MORE THAN 25* DIFFERENCE BETWEEN THE STAGES AND SUBSTANTIALLY UNIFORM TEMPERATURE WITHIN EACH STAGE BY MIXING WITH A HIGH DEGREE OF TURBULENCE WITHIN EACH STAGE TO ACHIEVE A MIXING REYNOLDS NUMBER OF FROM ABOUT 250 TO ABOUT 200,000, AND ACHIEVING PLUG FLOW EFFECT ALONG THE LENGTH OF THE REACTOR BY BAFFLES BETWEEN EACH STAGE, SO THE FINAL PRODUCTION HAS A WATER EXTRACTABLES CONTENT OF LESS THAN 3.5 PERCENT AND OLIGOMER CONTENT OF LESS THAN 2.5 PERCENT.

公开(公告)号：US3839530A

公开(公告)日：1974-10-01

申请号：US41931873

申请日：1973-11-27

Applicant: ALLIED CHEM

Inventor： BINGHAM A ,  PENDLEBURY D ,  LAZARUS S

IPC: C08G69/48 ,  C08G20/14 ,  D01F1/02 ,  D02G1/00

CPC classification number: C08G69/48

Abstract: 1. IN A PROCESS FOR THE FORMATION OF POLYCAPROAMIDDE FIBER FROM A FIBER-FORMING E-POLYCAPROAMIDE POLYMER HAVING EXCESS NUMBER OF CARBOXYL END GROUPS OVER AMINO END GROUPS, BY EXTRUDING THE MOLTEN POLYMER THROUGH AN ORIFICE INTO A QUENCHING MEDIUM AND THEREAFTER STRETCHING THE RESULTING FILAMENT, THE IMPROVEMENT WHEREIN SAID FIBER-FORMING E-POLYCAPROAMIDE POLYMER IS PREPARED BY A PROCESS COMPRISING: (A) CONTINUOUSLY FORMING A MOLTEN POLYMERIZATION REACTION MIXTURE AT 240*-290*C. FROM E-CAPROLACTAM; (B) CONTINUOUSLY SMOOTHLY STIRRING SAID REACTION MIXTURE WHILE FLOWING OVER THE SURFACE THEREOF A GAS CAPABLE OF REMOVING MOISTURE FROM SAID REACTION MIXTURE, AT A FLOW RATE OF AT LEAST 2 UNIT VOLUMES OF SAID GAS, MEASURED AT STANDARD TEMPERATURE AND PRESSURE, PER HOUR PER EACH UNIT VOLUME OF SAID REACTION MIXTURE, UNTIL THE TOTAL PRIMARY AMINO GROUP PLUS CARBOXYL GROUP ANALYSIS OF THE RESULTING POLYMER IS NOT ABOVE 135 MILLIEQUIVALENTS PER KILOGRAM OF POLYMER; AND THEN (C) CONTINUOUSLY REACTING SAID POLYMER AT 250-290*C. WITH ABOUT 0.1-0.7 MOL PER 100 MOLS OF LACTAM IN THE POLYMER, OF AN ESTER OF A DICARBOXYLIC ACID, HAVING THE FORMULA

R-OOC-R1-COO-R2

WHERE R IS A HYDROCARBON RADICAL HAVING BETWEEN 9 AND 16 CARBON ATOMS, R1 IS A HYDROCARBON RADICAL HAVING BETWEEN 4 AND 18 CARBON ATOMS, AND R2 IS HYDROGEN OR A HYDROCARBON RADICAL HAVING BETWEEN 9 AND 16 CARBON ATOMS, UNTIL THE PRIMARY AMINO GROUP ANALYSIS OF THE POLYMER IS NOT ABOVE 34 MILLIEQUIVALENTS PER KILOGRAM OF POLYMER AND THE CARBOXYL GROUP ANALYSIS OF THE POLYMER IS BETWEEN ABOUT 50 AND ABOUT 90 MILLIEQUIVALENTS PER KILOGRAM OF POLYMER, THEREBY REDUCING THE OCCURENCE OF NUBS IN THE FIBER.