Abstract 1. A TWO-STAGE CONTINUOUS PROCESS FOR PREPARING DWELLTIME STABILIZED, HIGH MOLECULAR WEIGHT LIANER POLYAMIDE GRANULES COMPRISING THE STEPS: (A) FORMING A SATURATED ALIPHATIC POLYCARBONAMIDE PREPOLYMER IN A FIRST STAGE BY REACTING ITS CORRESPONDING MONOMER IN THE PRESENCE OF A CONTROLLED AMOUNT OF INITIALLY ADDED WATER, RANGING FROM ABOUT 0.05% TO ABOUT 0.5% BY WEIGHT OF THE PREPOLYMER, WITH 10-3 TO 10-6 MOL OF INORGANIC ACID CATALYST PER MOL OF MONOMER AND 6X10-3 TO 0.1X10-3 MOL OD CHAIN STABILIZER PER MOL OF MONOMER, SAID CHAIN STABILIZER TAKEN FROM THE GROUP OF ALIPHATIC OR ARYL ACIDS CONSISTING OF MONO-AND DI-CARBOXYLIC ORGANIC ACIDS, SAID PREPOLYMER BEING CHARACTERIZED BY BEING JUST SPINNABLE, NON-BRITTLE AND HAVING A LOW RELATIVE VISCOSITY VALUE OF FROM ABOUT 2 TO ABOUT 2.5, EACH OF SAID FRANULES BEING SUBSTANTIALLY UNIFORM WITH RESPECT TO SAID LOW VISCOSITY; (B) SAID SECOND STAGE COMPRISES SIMULTANEOUSLY DRYING THE POLYCARBONAMIDE PREPOLYMER FORMED IN SAID FIRST STATE AT FROM ABOUT 30*C, TO ABOUT 80*C, BELOW THE MELTING POINT OF THE POLYCARBONAMIDE PREPOLYMER AND FURTHER POLYMERIZING SAID PREPOLYMER TO EXPEL WATER AND TO PERMIT CHAIN LENGTHENING TO CONTINUE UNTIL SAID PREPOLYMER REACHES A RELATIVE VISCOSITY VALUE IN THE RANGE OF FROM ABOUT 2.7 TO ABOUT 5.8, SAID RESULTING HIGHER MOLECULAR WEIGHT POLYCARBONAMIDE HAVING A SUBSTANTIALLY UNIFORM RELATIVE VISCOSITY WITHIN EACH GRANULE AND FROM GRANULE TO GRANULE, AND INDEPENDENT DWELL-TIME PROPERTIES RESULTING IN STABILIZATION THE VISCOSITY BEING DETERMINED BY 1G. POLYAMIDE PER 100 M1. OF CONCENTRATED SULPHURIC ACID AT 20*C.
Inventors
👤 K Ryffel
👤 H Lys
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-04 15:12
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
241 words
A TWO-STAGE CONTINUOUS PROCESS FOR PREPARING DWELLTIME STABILIZED, HIGH MOLECULAR WEIGHT LIANER POLYAMIDE GRANULES COMPRISING THE STEPS: (A) FORMING A SATURATED ALIPHATIC POLYCARBONAMIDE PREPOLYMER IN A FIRST STAGE BY REACTING ITS CORRESPONDING MONOMER IN THE PRESENCE OF A CONTROLLED AMOUNT OF INITIALLY ADDED WATER, RANGING FROM ABOUT 0.05% TO ABOUT 0.5% BY WEIGHT OF THE PREPOLYMER, WITH 10-3 TO 10-6 MOL OF INORGANIC ACID CATALYST PER MOL OF MONOMER AND 6X10-3 TO 0.1X10-3 MOL OD CHAIN STABILIZER PER MOL OF MONOMER, SAID CHAIN STABILIZER TAKEN FROM THE GROUP OF ALIPHATIC OR ARYL ACIDS CONSISTING OF MONO-AND DI-CARBOXYLIC ORGANIC ACIDS, SAID PREPOLYMER BEING CHARACTERIZED BY BEING JUST SPINNABLE, NON-BRITTLE AND HAVING A LOW RELATIVE VISCOSITY VALUE OF FROM ABOUT 2 TO ABOUT 2.5, EACH OF SAID FRANULES BEING SUBSTANTIALLY UNIFORM WITH RESPECT TO SAID LOW VISCOSITY; (B) SAID SECOND STAGE COMPRISES SIMULTANEOUSLY DRYING THE POLYCARBONAMIDE PREPOLYMER FORMED IN SAID FIRST STATE AT FROM ABOUT 30*C, TO ABOUT 80*C, BELOW THE MELTING POINT OF THE POLYCARBONAMIDE PREPOLYMER AND FURTHER POLYMERIZING SAID PREPOLYMER TO EXPEL WATER AND TO PERMIT CHAIN LENGTHENING TO CONTINUE UNTIL SAID PREPOLYMER REACHES A RELATIVE VISCOSITY VALUE IN THE RANGE OF FROM ABOUT 2.7 TO ABOUT 5.8, SAID RESULTING HIGHER MOLECULAR WEIGHT POLYCARBONAMIDE HAVING A SUBSTANTIALLY UNIFORM RELATIVE VISCOSITY WITHIN EACH GRANULE AND FROM GRANULE TO GRANULE, AND INDEPENDENT DWELL-TIME PROPERTIES RESULTING IN STABILIZATION THE VISCOSITY BEING DETERMINED BY 1G. POLYAMIDE PER 100 M1. OF CONCENTRATED SULPHURIC ACID AT 20*C.
Claim 2
Dependent Claim
241 words
A TWO-STAGE CONTINUOUS PROCESS FOR PREPARING DWELLTIME STABILIZED, HIGH MOLECULAR WEIGHT LIANER POLYAMIDE GRANULES COMPRISING THE STEPS: (A) FORMING A SATURATED ALIPHATIC POLYCARBONAMIDE PREPOLYMER IN A FIRST STAGE BY REACTING ITS CORRESPONDING MONOMER IN THE PRESENCE OF A CONTROLLED AMOUNT OF INITIALLY ADDED WATER, RANGING FROM ABOUT 0.05% TO ABOUT 0.5% BY WEIGHT OF THE PREPOLYMER, WITH 10-3 TO 10-6 MOL OF INORGANIC ACID CATALYST PER MOL OF MONOMER AND 6X10-3 TO 0.1X10-3 MOL OD CHAIN STABILIZER PER MOL OF MONOMER, SAID CHAIN STABILIZER TAKEN FROM THE GROUP OF ALIPHATIC OR ARYL ACIDS CONSISTING OF MONO-AND DI-CARBOXYLIC ORGANIC ACIDS, SAID PREPOLYMER BEING CHARACTERIZED BY BEING JUST SPINNABLE, NON-BRITTLE AND HAVING A LOW RELATIVE VISCOSITY VALUE OF FROM ABOUT 2 TO ABOUT 2.5, EACH OF SAID FRANULES BEING SUBSTANTIALLY UNIFORM WITH RESPECT TO SAID LOW VISCOSITY; (B) SAID SECOND STAGE COMPRISES SIMULTANEOUSLY DRYING THE POLYCARBONAMIDE PREPOLYMER FORMED IN SAID FIRST STATE AT FROM ABOUT 30*C, TO ABOUT 80*C, BELOW THE MELTING POINT OF THE POLYCARBONAMIDE PREPOLYMER AND FURTHER POLYMERIZING SAID PREPOLYMER TO EXPEL WATER AND TO PERMIT CHAIN LENGTHENING TO CONTINUE UNTIL SAID PREPOLYMER REACHES A RELATIVE VISCOSITY VALUE IN THE RANGE OF FROM ABOUT 2.7 TO ABOUT 5.8, SAID RESULTING HIGHER MOLECULAR WEIGHT POLYCARBONAMIDE HAVING A SUBSTANTIALLY UNIFORM RELATIVE VISCOSITY WITHIN EACH GRANULE AND FROM GRANULE TO GRANULE, AND INDEPENDENT DWELL-TIME PROPERTIES RESULTING IN STABILIZATION THE VISCOSITY BEING DETERMINED BY 1G. POLYAMIDE PER 100 M1. OF CONCENTRATED SULPHURIC ACID AT 20*C.