Process of extruding composition comprising a fiber forming linear condensation product and a thickening agent

Claim 1

A PROCESS FOR THE PREPARATION OF MASSIVE SELF-SUPPORTING SHAPED EXTRUSION PRODUCTS OF SUBSTANTIAL CROSSSECTION FROM EXTRUSION MATERIALS, CONSISTING ESSENTIALLY OF HIGH MOLECULAR WEIGHT FIBER-FORMING LINEAR POLYCONDENSATION PRODUCTS SELECTED FROM THE CLASS CONSISTING OF LONG CHAIN SYNTHETIC LINEAR POLYAMIDES WHICH HAVE RECURRING AMIDE GROUPS AS AN INTEGRAL PART OF THE MAIN POLYMER CHAIN AND LINEAR POLYURETHANES, SAID PROCESS CONSISTING OF PREPARING A PHYSICAL MIXTURE OF (A) SAID POLYCONDENSATION PRODUCT AND (B) FROM 0.2% UP TO A MAXIMUM OF 2%, BY WEIGHT OF SAID POLYCONDENSATION PRODUCT, OF P-DI(EPOXY-PROPOXY) BENZENE AS A HIGH TEMPERATURE THICKENING AGENT WHEN PRESENT IN THE SAME PROPORTION HAVING NO APPRECIABLE EFFECT ON SAID POLYCONDENSATION PRODUCT AT ORDINARY ROOM TEMPERATURE BUT SO THICKENING, IN MOLTEN CONDITION, THE SAME POLYCONDENSATION PRODUCT CONTAINING UP TO A MIXTURE OF 2.5% BY WEIGHT OF WATERSOLUBLE COMPONENTS, THAT THE RATIO BETWEEN THE FLOW RATE, DETERMINED BY MEANS OF THE EXTRUSION PLASTOMETER ACCORDING TO A.S.T.M. D.1238-52 T, OF THE UNMIXED POLYCONDENSATION PRODUCT AND THE FLOW RATE OF THE POLYCONDENSATION PRODUCT MIXED WITH THE HIGH TEMPERATURE THICKENING AGENT AMOUNTS TO AT LEAST 1.5, AND THEN RAPIDLY EXTRUDING THE RESULTING PHYSICAL MIXTURE OF HIGH MOLECULAR WEIGHT LINEAR POLYCONDENSATION PRODUCT AND HIGH TEMPERATURE THICKENING AGENT UNDER CONDITION OF ELEVATED TEMPERATURES AT WHICH SAID MIXTURE IS MOLTEN INTO A MASSIVE SELF-SUPPORTING SHAPED PRODUCT OF SUBSTANTIAL CROSS-SECTION THEREBY AT LEAST GREATLY MINIMIZING DIFFICULTIES DUE TO RAPID CHANGES IN PLASTICITY OF SAID HIGH MOLECULAR WEIGHT LINEAR POLYCONDENSTION PRODUCTS PER SE ON MELTING.