A process for making a branched cyclic olefin copolymer (bCOC), and the bCOC therefrom, comprising combining at a temperature within a range from 60° C. to 140° C. a catalyst precursor and an activator with a feed comprising ethylene and at least one cyclic olefin; where the catalyst precursor is selected from the group consisting of C.sub.S-symmetric Group 4 metallocenes comprising any two ligands selected from cyclopentadienyl and ligands isolobal to the cyclopentadienyl group. The resulting bCOC is desirably semi-crystalline and useful in such articles as tubing, thermoformed and foamed articles.

The cyclic olefin-based resin composition of the present invention is a cyclic olefin-based resin composition including: a cyclic olefin-based copolymer (A); and inorganic fine particles (B) having a surface modified by a modifier, in which the modifier is one kind or two or more kinds selected from the group consisting of a phosphoric acid ester, an organic phosphonic acid, a phosphonic acid ester, a carboxylic acid, a sulfonic acid, a hydrocarbon compound having an amino group, and a silane coupling agent, and the inorganic fine particles (B) exist in a state of being dispersed in the cyclic olefin-based copolymer (A).

Provided herein are VLDPE polymer compositions suitable for use in the manufacture of flexible films or sheets. In one embodiment, the copolymer comprises a polyethylene VLDPE resin with M.sub.z/M.sub.w of greater than 2, CDBI.sub.50 of greater than 55 and a single melting peak in DSC measurement. The polymer compositions disclosed herein may be suitable for use in the manufacture of films with improved balance of film toughness, processability and sealability in monolayer and multi-layer film structures.

A polyethylene composition which when made into a film layer having a thickness of about 1 mil exhibits a machine direction (MD) 1% secant modulus of ≥190 MPa and an oxygen transmission rate (OTR) of ≥650 cm.sup.3 per 100 inch.sup.2 per day, and when made into a film layer having a thickness of about 2 mil exhibits a seal initiation temperature (SIT) of ≤100° C. and an area of hot tack window (AHTW) of ≥160 Newtons.Math.° C.

The present invention relates to an olefin-based polymer exhibiting a single peak when analyzed by gel permeation chromatography (GPC), and having three elution temperatures Te1, Te2 and Te3 when measuring temperature rising elution fractionation (TREF) at a temperature ranging from −20° C. to 120° C. Accordingly, the olefin-based polymer having excellent mechanical strength, and in particular, significantly improved impact strength is provided.

The invention relates to a process for the preparation of a particulate ultra high molecular weight polyethylene (UH-MWPE), comprising the steps of preparing a magnesium containing carrier, loading the carrier with a organometallic compound forming a supported catalyst and contacting the supported catalyst with at least ethylene under polymerization conditions, wherein the organometallic compound is of the formula R.sup.3.sub.3P═N—TiCpX.sub.n.

A catalyst system comprising a) a metal complex of the formula CyLMZ.sub.p, wherein M is a group 4 metal Z is an anionic ligand, p is number of 1 to 2, preferably 2 Cy is a cyclopentadienyl-type ligand and, L is a ligand of the formula ##STR00001## wherein each A is independently selected from the group consisting of nitrogen and phosphorus and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently selected from the group consisting of hydrogen, unsubstituted or substituted hydrocarbyl, unsubstituted or substituted silyl and unsubstituted or substituted germyl residues, and b) a boron containing activator, characterized in that the molar ratio of the boron of the activator to M of the metal complex is greater than 2.5.

Ethylene/1-butene copolymers made with a single site catalyst system have high melt strength and good processability.

This disclosure relates to rotomolded articles, having a wall structure, where the wall structure contains at least one layer containing an ethylene interpolymer product, or a blend containing an ethylene interpolymer product and an ethylene polymer, where the ethylene interpolymer product has a Dilution Index (Y.sub.d) greater than 0 and improved Environmental Stress Crack Resistance (ESCR). The ethylene interpolymer product has a melt index from about 0.5 to about 15 dg/minute, a density from about 0.930 to about 0.955 g/cm.sup.3, a polydispersity (M.sub.w/M.sub.n) from about 2 to about 6 and a CDBI.sub.50 from about 50% to about 98%. Further, the ethylene interpolymer products are a blend of at least two ethylene interpolymers; where one ethylene interpolymer is produced with a single-site catalyst formulation and at least one ethylene interpolymer is produced with a heterogeneous catalyst formulation.

The present invention provides a polyolefin polymer having a bimodal composition with a reduced higher molecular weight component prepared using a self-supported phosphinimine single site catalyst. The catalyst is prepared by precipitating an emulsion of the activated catalyst from a perfluoroalkane continuous phase resulting in spherical catalyst particles having a diameter typically from 5 to 200 μm.