Novel catalyst compositions comprising three or more transition metals are effective in increasing catalyst efficiency, reducing polydispersity, and increasing uniformity in molecular weight distribution when used in olefin, and particularly, linear low density polyethylene (LLDPE), polymerizations. The resulting polymers may be used to form differentiated products including, for example, films that may exhibit improved optical and mechanical properties.

Novel catalyst compositions comprising three or more transition metals are effective in increasing catalyst efficiency, reducing polydispersity, and increasing uniformity in molecular weight distribution when used in olefin, and particularly, linear low density polyethylene (LLDPE), polymerizations. The resulting polymers may be used to form differentiated products including, for example, films that may exhibit improved optical and mechanical properties.

An anti-counterfeiting yarn includes a uniformly distributed up-conversion fluorescent material and a polymer, wherein the up-conversion fluorescent material comprises a maximum weight percent of about 1.8%. A method of preparing an anti-counterfeiting yarn includes mixing functional polymer chips containing up-conversion fluorescent material with polymer chips not containing up-conversion fluorescent material in a ratio such that the fluorescent material is uniformly distributed in the mixture, melting the mixture, extruding the melt into filaments, and producing anti-counterfeiting yarn through spinning and drawing the filaments.

The present invention relates to stretched polyolefin fibers comprising a polymer comprising at least one polymeric modifier selected from olefinic polymers modified with an acid and/or an acid anhydride, the use of these fibers in the reinforcement of cementitious compositions, and cementitious composition containing these fibers.

Disclosed herein is a composition having a plurality of particles of a filler material and crosslinking units having the formula —(SiR—CH.sub.2—CH.sub.2—CH.sub.2)—. The silicon atom in the crosslinking unit is directly or indirectly bound to the filler material. Each R is alkyl, alkenyl, phenyl, methyl, ethyl, allyl, halogen, chloro, or bromo. Also disclosed herein is a filler material having the silicon atom of a silacyclobutane group is directly or indirectly bound thereto. Also disclosed herein is a method of crosslinking silacyclobutane groups bound to a plurality of particles of a filler material. The silicon atom of the silacyclobutane group is directly or indirectly bound to the filler material. Also disclosed herein is a composition including a plurality of fibers of a polymer having reactive oxygen atoms and siloxane groups. Coordination bonds are formed between the oxygen atoms and the silicon atoms of the siloxane groups of separate fibers.

Disclosed herein is a composition having a plurality of particles of a filler material and crosslinking units having the formula —(SiR—CH.sub.2—CH.sub.2—CH.sub.2)—. The silicon atom in the crosslinking unit is directly or indirectly bound to the filler material. Each R is alkyl, alkenyl, phenyl, methyl, ethyl, allyl, halogen, chloro, or bromo. Also disclosed herein is a filler material having the silicon atom of a silacyclobutane group is directly or indirectly bound thereto. Also disclosed herein is a method of crosslinking silacyclobutane groups bound to a plurality of particles of a filler material. The silicon atom of the silacyclobutane group is directly or indirectly bound to the filler material. Also disclosed herein is a composition including a plurality of fibers of a polymer having reactive oxygen atoms and siloxane groups. Coordination bonds are formed between the oxygen atoms and the silicon atoms of the siloxane groups of separate fibers.

The invention relates to a method for making a nonwoven fabric comprising forming polymer fibers from a melt of the polymer material and using these fibers to obtain a nonwoven fabric during a subsequent nonwoven fabric formation procedure, wherein the melt of the polymer material comprises a melt additive, wherein the method comprises thermal bonding at a temperature higher than 40° C. below the melting point of the polymer material and, additionally, one or both of the following steps: a. improving the mobility of the additive by heat-treating the nonwoven fabric at 100° C. or more for 0.1 seconds or more after the nonwoven fabric formation procedure and/or including a filler having a higher thermal conductivity than the polymer material to the polymer material; b. influencing the polymer crystallinity by including a nucleating agent, branched polymers and/or random co-polymers to the polymer material.

A method for preparing gelatinized pre-oriented filaments and the gelatinized pre-oriented filaments prepared by the method are provided. The method includes feeding a spinning dope into a twin-screw extruder for blending and extruding the spinning dope to obtain a first spinning solution having a non-Newtonian index of 0.1-0.8 and a structural viscosity index of 10-50, feeding the first spinning solution into a spinning box and drawing at a spinneret with a factor of 5-20 to obtain a second spinning solution, and flash cooling and curing the second spinning solution to obtain the gelatinized pre-oriented filaments. Also provided are a method for preparing ultra-high molecular weight polyethylene fibers and ultra-high molecular weight polyethylene fibers prepared by the method.

A method for preparing gelatinized pre-oriented filaments and the gelatinized pre-oriented filaments prepared by the method are provided. The method includes feeding a spinning dope into a twin-screw extruder for blending and extruding the spinning dope to obtain a first spinning solution having a non-Newtonian index of 0.1-0.8 and a structural viscosity index of 10-50, feeding the first spinning solution into a spinning box and drawing at a spinneret with a factor of 5-20 to obtain a second spinning solution, and flash cooling and curing the second spinning solution to obtain the gelatinized pre-oriented filaments. Also provided are a method for preparing ultra-high molecular weight polyethylene fibers and ultra-high molecular weight polyethylene fibers prepared by the method.

Processes for preparing ultra-high molecular weight polyethylene (“UHMW PE”) filaments and multi-filament yarns, and the yarns and articles produced therefrom. Each process produces UHMW PE yarns having tenacities of 45 g/denier to 60 g/denier or more at commercially viable throughput rates.