Abstract: A process for improving the processability of poly(arylene sulfide) in melt spinning operations by treatment with a barium-containing compound and, optionally, a lubricant is disclosed.

Abstract: A recyclable thermoplastic tufted fabric made of a partially meltable primary backing and tufts tufted into the primary backing. The tufts are bonded to the backing by partially melting the backing to bond the tufts and applying a secondary backing. Such a carpet can be recycled through processes known to recycle polyester.

Abstract: A recyclable thermoplastic tufted fabric made of a partially meltable primary backing and tufts tufted into the primary backing. The tufts are bonded to the backing by partially melting the backing to bond the tufts and applying a secondary backing. Such a carpet can be recycled through processes known to recycle polyester.

Abstract: A method of melt spinning sheath/core bicomponent fibers including the steps of passing multiple streams of pressurized molten core polymer from distributor flow passages into multiple parallel spinneret flow passages in respective axial or coaxial alignment with said multiple distributor flow passages. In pressured molten sheath polymer is passed through channels positioned in the top surface of the spinneret and surrounding the inlets of the spinneret flow passages. The sheath polymer is directed to flow from the channels into each of the spinneret flow passages and each of the polymer streams at a controlled pressure drop.

Abstract: An apparatus for spinning bicomponent sheath/core filaments having a distributor plate and spinnerette and a shim positioned between the distributor plate and spinnerette to effect a controlled pressure drop of the sheath polymer material. In particular, the distributor plate and spinnerette each have a plurality of spaced core polymer flow passages and sheath polymer passages wherein the respective core polymer flow passages are axially aligned and the respective sheath polymer flow passages are aligned. The shim is positioned between the spinnerette and distributor plate to control the sheath polymer flow from the outlet of the distributor sheath polymer flow passages to the inlet of each spinnerette core polymer flow passage separately. Producing sheath/core bicomponent fibers using this apparatus results in fibers having concentric sheath/core configurations and increased throughput.

Abstract: A thermally bonded fibrous wet laid web containing a bicomponent fiber including a polyester or polyamide fiber component and a component consisting of a linear low density polyethylene having a density in the range of 0.88 to 0.945 g/cc. A grafted HDPE can be added to the LLDPE to improve adhesion of the bicomponent fiber. The bonded fibrous wet laid web may further include a matrix fiber selected from the group consisting of cellulose paper making fibers, cellulose acetate fibers, glass fibers, polyester fibers, ceramic fibers, mineral wool fibers, polyamide fibers, and other naturally occurring fibres. It has been found that a thermally nonwoven fibrous web made using the foregoing ingredients has improved and unexpected strength, lower web variability and is softer.

Abstract: Poly(butylene terephthalate) copolyester advantageous of use as sheath materials in bicomponent fibers are prepared by a process for preparing a high-molecular weight, linear copolyester by condensing 40-85 molar percent of terephthalic acid optionally in the form of a dialkyl ester, half of which component can optionally be replaced by another dicarboxylic acid also optionally in the dialkyl ester form, and 60-15 molar percent of a blend of dimethyl adipate, dimethyl glutarate and dimethyl succinate with an alkanediol of 2-6 carbon atoms in its carbon chain, at an elevated temperature in the presence of a conventional catalyst, in a first condensation stage which is an interesterification or esterification stage and a second condensation stage which is polycondensation stage, whereby a copolyester melt is produce. The process comprises, before or during the first condensation stage, adding 0.005-0.1 molar percent, based on the total acid component, of a C.sub.6 -aryl or C.sub.

Abstract: Poly(butylene terephthalate) copolyester advantageous of use as sheath materials in bicomponent fibers are prepared by a process for preparing a high-molecular weight, linear copolyester by condensing 40-85 molar percent of terephthalic acid optionally in the form of a dialkyl ester, half of which component can optionally be replaced by another dicarboxylic acid also optionally in the dialkyl ester form, and 60-15 molar percent of a blend of dimethyl adipate, dimethyl glutarate and dimethyl succinate with an alkanediol of 2-6 carbon atoms in its carbon chain, at an elevated temperature in the presence of a conventional catalyst, in a first condensation stage which is an interesterification or esterification stage and a second condensation stage which is a polycondensation stage, whereby a copolyester melt is produce. The process comprises, before or during the first condensation stage, adding 0.005-0.1 molar percent, based on the total acid component, of a C.sub.6 -aryl or C.sub.

Abstract: A selfbonded nonwoven fabric comprising at least 70 weight percent of sheath/core heterofilaments having a core of isotactic polypropylene in which the sheaths are high density polyethylene in an amount of 5 to 30 weight percent of the heterofilaments, and method of preparation. The fabrics have outstanding strength, fatigue resistance, and tear resistance and are eminently suitable for civil engineering applications such as unpaved road underlay material.

Abstract: A selfbonded nonwoven fabric comprising at least 70 weight percent of sheath/core heterofilaments having a core of isotactic polypropylene in which the sheaths are high density polyethylene in an amount of 5 to 30 weight percent of the heterofilaments, and method of preparation. The fabrics have outstanding strength, fatigue resistance, and tear resistance and are eminently suitable for civil engineering applications such as unpaved road underlay material.