Tow with internally incorporated additive

Claim 1

AN INTERMEDIATE MATERIAL USEFUL IN THE MANUFACTURE OF TOBACCO SMOKE FILTER ELEMENTS COMPRISED OF A WRAPPED BUNDLE OF CONTINUOUS FIBERS OF A DENIER/FILAMENT OF 0.6-15, SAID FIBERS HAVING ROUGH, IRREGULAR PROTRUSIONS OF FINE, SOLID PARTICLES OF CRYSTALLINE MATERIAL OBTAINED FROM HAVING INCORPORATED INTO THE FIBER-FORMING POLYMERIC SUBSTANCE FROM WHICH SAID FIBERS ARE EXTRUDED AN INTERNALLY INCORPORATED ORGANIC CRYSTALLIZABLE COMPOUND COMPATIBLE WITH SAID POLYMERIC SUBSTANCE, SAID COMPOUND BEING HEATSTABLE, SUBSTANTIALLY WATER-INSOLUBLE AND NON-OILY WITH A MELTING POINT OF NOT LESS THAN ABOUT 40*C. CHARACTERIZED IN THAT IT IS CAPABLE OF MIGRATING TO THE SURFACE OF THE EXTRUDED FIBERS OVER A PERIOD OF SEVERAL DAYS BY EXUDING TO FORM SAID ROUGH, IRREGULAR PROTRUSSIONS WHICH BECOME VISIBLE UNDER A MICROSCOPE AS MINUTE CRYSTAL PROTRUSIONS OF SOLID EXUDATE AFTER ABOUT FOUR DAYS, SAID COMPOUND BEING ONE OF THE MEMBERS OF THE REACTING COMPOUNDS AND REACTION PRODUCTS OF THE REACTION BETWEEN AN ALCOHOL AND AN ORGANIC ACID TO FORM AN ESTER, SAID COMPOUND HAVING BEEN INCORPORATED IN SAID POLYMERIC SUBSTANCE IN AN AMOUNT SUFFICIENT WITHIN THE RANGE OF 5-40% TO MIGRATE TO THE SURFACE OF THE EXTRUDED FIBERS TO FORM SAID ROUGH, IRREGULAR PROTRUSSIONS OF SOLID CRYSTALLINE MATERIAL, THE EXTRUDED FIBERS HAVING BEEN STORED PRIOR TO USE AS SAID INTERMEDIATE FOR AT LEAST SAID FOUR DAYS SO THAT SAID MIGRATION HAS OCCURRED WHEREBY SAID COMPOUND HAS SOLIDIFIED ON THE SURFACE OF THE FIBER S IN THE FORM OF SAID ROUGH, IRREGULAR PROTRUSSIONS.