Lubricated polypropylene polyethylene self-bonded nonwoven carpet backing

Claim 1

A LUBRICATED SELF-BONDED NONWOVEN SHEET OF RANDOMLY DISPERSED, OVERLAPPING AND INTERSECTING HIGHLY CRYSTALLINE AND ORIENTED SYNTHETIC CONTINUOUS FILAMENTS OF POLYMERS OF THE GROUP CONSISTING OF ISOTATIC POLYPROPYLENE, LINEAR POLYETHYLENE, CRYSTALLINE COPOLYMERS OF AT LEAST 75% PROPYLENE OR ETHYLENE WITH UP TO 25% BY WEIGHT OF OTHER COPOLYMERIZABLE MONOMERS AND MIXTURES OF ISOTACTIC POLYPROPYLENE OR LINEAR POLYETHYLENE WITH UP TO 25% BY WEIGHT OF OTHER POLYMERS, SAID FILAMENTS HAVING A DENIER BETWEEN 3 AND 15 AND BEING SUBSTANTIALLY SEPARATE AND INDEPENDENT FROM EACH OTHER THROUGHOUT THE SHEET EXCEPT AT CROSSOVER POINTS, THE SAID FILAMENTS BEING SELF-BONDED AT A MULTIPLICITY OF SUCH INTERSECTION POINTS AND POSSESSING A BIREFRINGENCE THAT IS AT LEAST 40% OF THE MAXIMUM BIREFRINGENCE, SAID SHEET HAVING AN AVERAGE EDGE BOND COUNT OF BETWEEN ABOUT 30 AND 80 BONDS PER 100 FILAMENTS AND CONTAINING FROM ABOUT 0.3% TO ABOUT 5% BY WEIGHT OF A LUBRICANT THAT IS INERT TO THE FILAMENTS, SAID LUBRICANT BEING SELECTED FROM THE GROUP CONSISTING OF METHYL HYDROGEN POLYSILOXANE, DIMETHYL POLYSILOXANE, 2-ETHYLHEXYL SILICATE, 2-ETHYLHEXYL SEBACATE, DIOCYTL SEBACAE, ACETYL 2-ETHYLHEXYL CITRATE, REFINED COCONUT OIL, POTASSIUM OLEATE, POTASSIUM N-OCTYL PHOSPHATES, DIETHANOLAMINE SALTS OR C8-C12 ALKYL HYDROGEN PHOSPHATES AND MIXED N-OCTYL B-HYDROXY-ETHYL ESTERS OF PHOSPHORIC ACID.