The present disclosure relates to a linear low-density polyethylene copolymer and a preparation method thereof. The linear low-density polyethylene copolymer has a long-chain branching (LCB) distribution similar to that of general metallocene polyethylene (mPE) and has good mechanical properties such as processability and toughness. Thus, the linear low-density polyethylene copolymer is useful for molding into shrinkage films, agricultural films, etc.

The present disclosure relates to a linear low-density polyethylene copolymer and a preparation method thereof. The linear low-density polyethylene copolymer has a long-chain branching (LCB) distribution similar to that of general metallocene polyethylene (mPE) and has good mechanical properties such as processability and toughness. Thus, the linear low-density polyethylene copolymer is useful for molding into shrinkage films, agricultural films, etc.

A hinged component comprises a polyethylene composition having a density of from 0.940 to 0.965 g/cm.sup.3, a melt index of less than 30 g/10 min, a molecular weight distribution M.sub.w/M.sub.n of less than 5.0 and a unimodal profile in a gel permeation chromatograph.

A hinged component comprises a polyethylene composition having a density of from 0.940 to 0.965 g/cm.sup.3, a melt index of less than 30 g/10 min, a molecular weight distribution M.sub.w/M.sub.n of less than 5.0 and a unimodal profile in a gel permeation chromatograph.

Supported chromium catalysts containing a solid oxide and 0.1 to 15 wt. % chromium, in which the solid oxide or the supported chromium catalyst has a particle size span from 0.5 to 1.4, less than 3 wt. % has a particle size greater than 100 μm, and less than 10 wt. % has a particle size less than 10 μm, can be contacted with an olefin monomer in a loop slurry reactor to produce an olefin polymer. Representative ethylene-based polymers produced using the chromium catalysts have a HLMI of 4 to 70 g/10 min, a density from 0.93 to 0.96 g/cm.sup.3, from 150 to 680 ppm solid oxide (such as silica), from 1.5 to 6.8 ppm chromium, and a film gel count of less than 15 catalyst particle gels per ft.sup.2 of 25 micron thick film and/or a gel count of less than or equal to 50 catalyst particles of greater than 100 μm per five grams of the ethylene polymer.

Supported chromium catalysts containing a solid oxide and 0.1 to 15 wt. % chromium, in which the solid oxide or the supported chromium catalyst has a particle size span from 0.5 to 1.4, less than 3 wt. % has a particle size greater than 100 μm, and less than 10 wt. % has a particle size less than 10 μm, can be contacted with an olefin monomer in a loop slurry reactor to produce an olefin polymer. Representative ethylene-based polymers produced using the chromium catalysts have a HLMI of 4 to 70 g/10 min, a density from 0.93 to 0.96 g/cm.sup.3, from 150 to 680 ppm solid oxide (such as silica), from 1.5 to 6.8 ppm chromium, and a film gel count of less than 15 catalyst particle gels per ft.sup.2 of 25 micron thick film and/or a gel count of less than or equal to 50 catalyst particles of greater than 100 μm per five grams of the ethylene polymer.

A bimodal polymer composition comprising a lower molecular weight homopolymer and a higher molecular weight copolymer wherein the bimodal polymer composition has a density of from about 0.930 gram per cubic centimeter (g/cc) to about 0.970 g/cc, a ratio of high load melt index:melt index of from about 10 to about 150 and an Environmental Stress Crack Resistance (ESCR) of from about 25 hours to about 300 hours when measured in accordance with ASTM D1693 or ASTM D2561. A chromium-catalyzed polymer composition comprising (i) a lower molecular weight homopolymer and (ii) a higher molecular weight copolymer, wherein the bimodal polymer composition has an Environmental Stress Crack Resistance (ESCR) of from about 25 hours to about 300 hours when measured in accordance with ASTM D1693 or ASTM D2561.

A bimodal polymer composition comprising a lower molecular weight homopolymer and a higher molecular weight copolymer wherein the bimodal polymer composition has a density of from about 0.930 gram per cubic centimeter (g/cc) to about 0.970 g/cc, a ratio of high load melt index:melt index of from about 10 to about 150 and an Environmental Stress Crack Resistance (ESCR) of from about 25 hours to about 300 hours when measured in accordance with ASTM D1693 or ASTM D2561. A chromium-catalyzed polymer composition comprising (i) a lower molecular weight homopolymer and (ii) a higher molecular weight copolymer, wherein the bimodal polymer composition has an Environmental Stress Crack Resistance (ESCR) of from about 25 hours to about 300 hours when measured in accordance with ASTM D1693 or ASTM D2561.

This disclosure relates to ethylene interpolymer products comprising a Melt Flow-Intrinsic Viscosity Index value, MFIVI, of from ≥ 0.05 to ≤ 0.80; a first derivative of a melt flow distribution function, formula (I) at a loading of 4000 g, of from ≥ -1.85 to ≤-1.51; a sum of unsaturation, SUM.sup.U, from ≥ 0.047 to ≤ 0.100 unsaturations per 100 carbon atoms; and a residual catalytic metal of from ≥ 0.03 to ≤ 5 ppm of hafnium. Ethylene interpolymer products comprise at least two ethylene interpolymers. Ethylene interpolymer products are characterized by a melt index (I.sub.2) from 0.3 to 500 dg/minute, a density from 0.855 to 0.975 g/cc and from 0 to 25 mole percent of one or more a-olefins. Ethylene interpolymer products have polydispersity, M.sub.w/M.sub.n, from 1.7 to 25; and CDBI.sub.50 values from 1% to 98%. These ethylene interpolymer products have utility in flexible as well as rigid applications.

[00001]$\frac{dLog(1/I_n)}{dLog(loading)}$

This disclosure relates to ethylene interpolymer products comprising a Melt Flow-Intrinsic Viscosity Index value, MFIVI, of from ≥ 0.05 to ≤ 0.80; a first derivative of a melt flow distribution function, formula (I) at a loading of 4000 g, of from ≥ -1.85 to ≤-1.51; a sum of unsaturation, SUM.sup.U, from ≥ 0.047 to ≤ 0.100 unsaturations per 100 carbon atoms; and a residual catalytic metal of from ≥ 0.03 to ≤ 5 ppm of hafnium. Ethylene interpolymer products comprise at least two ethylene interpolymers. Ethylene interpolymer products are characterized by a melt index (I.sub.2) from 0.3 to 500 dg/minute, a density from 0.855 to 0.975 g/cc and from 0 to 25 mole percent of one or more a-olefins. Ethylene interpolymer products have polydispersity, M.sub.w/M.sub.n, from 1.7 to 25; and CDBI.sub.50 values from 1% to 98%. These ethylene interpolymer products have utility in flexible as well as rigid applications.

[00001]$\frac{dLog(1/I_n)}{dLog(loading)}$