Abstract 1. A METHOD FOR PREPARING POLYTETRAFLUOROETHYLENE ADAPTED FOR MOLDING PRECISION PARTS AND THIN SHEETING, COMPRISING THE SEQUENTIAL STEPS OF (A) SUBJECTING PARTICLES OF POLYTETRAFLUOROETHYLENE, WHICH PARTICLES ARE AT LEAST 100 MICRONS IN THEIR SMALLEST DIMENSION, TO MILLING EFFECTED SUBSTANTIALLY SOLELY BY INTERPARTICULATE COLLISION, AT A TEMPERATURE OF LESS THAN ABOUT 200*F.; (B) CLASSIFYING THE MILLED PARTICLES TO SEPARATE THEREFROM PARTICLES HAVING A MAXIMUM DIMENSION OF UP TO AND INCLUDING ABOUT 50 MICRONS, WET-SIEVE SIZE; AND (C) SUBJECTING THE UNSEPARATED PARTICLES OF LARGER THAN ABOUT 50 MICRONS, WET-SIEVE SIZE, REPEATEDLY TO THE MILLING EFFECTED SUBSTANTIALLY SOLELY BY INTERPARTICULATE COLLISION, AT A TEMPERATURE OF LESS THAN ABOUT 200*F.
A METHOD FOR PREPARING POLYTETRAFLUOROETHYLENE ADAPTED FOR MOLDING PRECISION PARTS AND THIN SHEETING, COMPRISING THE SEQUENTIAL STEPS OF (A) SUBJECTING PARTICLES OF POLYTETRAFLUOROETHYLENE, WHICH PARTICLES ARE AT LEAST 100 MICRONS IN THEIR SMALLEST DIMENSION, TO MILLING EFFECTED SUBSTANTIALLY SOLELY BY INTERPARTICULATE COLLISION, AT A TEMPERATURE OF LESS THAN ABOUT 200*F.; (B) CLASSIFYING THE MILLED PARTICLES TO SEPARATE THEREFROM PARTICLES HAVING A MAXIMUM DIMENSION OF UP TO AND INCLUDING ABOUT 50 MICRONS, WET-SIEVE SIZE; AND (C) SUBJECTING THE UNSEPARATED PARTICLES OF LARGER THAN ABOUT 50 MICRONS, WET-SIEVE SIZE, REPEATEDLY TO THE MILLING EFFECTED SUBSTANTIALLY SOLELY BY INTERPARTICULATE COLLISION, AT A TEMPERATURE OF LESS THAN ABOUT 200*F.
Claim 2
Independent Claim
105 words
A METHOD FOR PREPARING POLYTETRAFLUOROETHYLENE ADAPTED FOR MOLDING PRECISION PARTS AND THIN SHEETING, COMPRISING THE SEQUENTIAL STEPS OF (A) SUBJECTING PARTICLES OF POLYTETRAFLUOROETHYLENE, WHICH PARTICLES ARE AT LEAST 100 MICRONS IN THEIR SMALLEST DIMENSION, TO MILLING EFFECTED SUBSTANTIALLY SOLELY BY INTERPARTICULATE COLLISION, AT A TEMPERATURE OF LESS THAN ABOUT 200*F.; (B) CLASSIFYING THE MILLED PARTICLES TO SEPARATE THEREFROM PARTICLES HAVING A MAXIMUM DIMENSION OF UP TO AND INCLUDING ABOUT 50 MICRONS, WET-SIEVE SIZE; AND (C) SUBJECTING THE UNSEPARATED PARTICLES OF LARGER THAN ABOUT 50 MICRONS, WET-SIEVE SIZE, REPEATEDLY TO THE MILLING EFFECTED SUBSTANTIALLY SOLELY BY INTERPARTICULATE COLLISION, AT A TEMPERATURE OF LESS THAN ABOUT 200*F.