Chevron Phillips Chemical Company LP

Alfred E Brown, Jr

Yongwoo Inn

Jeremy M Praetorius

Qing R Yang

Carlos A Cruz

Jay M Chaffin

Brandy Rutledge-Ryal

Youlu Yu

Ashish M Sukhadia

Vivek Rohatgi

Jeffrey F Greco

Qing Yang

Vivek Rohati

Ethylene-based polymers having a density of 0.952 to 0.968 g/cm, a ratio of HLMI/MI from 185 to 550, an IB parameter from 1.46 to 1.80, a tan δ at 0.1 secfrom 1.05 to 1.75 degrees, and a slope of a plot of viscosity versus shear rate at 100 secfrom 0.18 to 0.28 are described, with low melt flow versions having a HLMI from 10 to 30 g/10 min and a Mw from 250,000 to 450,000 g/mol, and high melt flow versions having a HLMI from 30 to 55 g/10 min and a Mw from 200,000 to 300,000 g/mol. These polymers have the processability of chromium-based resins, but with improved stress crack resistance and topload strength for bottles and other blow molded products.

Dual metallocene polyethylene with improved processability for lightweight blow molded products

Ethylene-based polymers are characterized by a melt index less than 1 g/10 min, a density from 0.94 to 0.965 g/cm, a Mw from 100,000 to 250,000 g/mol, a relaxation time from 0.5 to 3 sec, and an average number of long chain branches (LCBs) per 1,000,000 total carbon atoms in a molecular weight range of 300,000 to 900,000 g/mol that is greater than that in a molecular weight range of 1,000,000 to 2,000,000 g/mol, or an average number of LCBs per 1,000,000 total carbon atoms in a molecular weight range of 1,000,000 to 2,000,000 g/mol of less than or equal to about 5 and a maximum ratio of η/3η at an extensional rate of 0.1 secfrom 1.2 to 10. These polymers have substantially no long chain branching in the high molecular weight fraction of the polymer, but instead have significant long chain branching in a lower molecular weight fraction, such that polymer melt strength and parison stability are maintained for the fabrication of blow molded products and other articles of manufacture. These ethylene polymers can be produced using a dual catalyst system containing a single or two atom bridged metallocene compound with two indenyl groups, and a single atom bridged metallocene compound with a fluorenyl group and a cyclopentadienyl group.

Dual catalyst system for producing polyethylene with long chain branching for blow molding applications

Ethylene-based polymers having a density of 0.952 to 0.968 g/cm, a ratio of HLMI/MI from 185 to 550, an IB parameter from 1.46 to 1.80, a tan &#x3b4; at 0.1 secfrom 1.05 to 1.75 degrees, and a slope of a plot of viscosity versus shear rate at 100 secfrom 0.18 to 0.28 are described, with low melt flow versions having a HLMI from 10 to 30 g/10 min and a Mw from 250,000 to 450,000 g/mol, and high melt flow versions having a HLMI from 30 to 55 g/10 min and a Mw from 200,000 to 300,000 g/mol. These polymers have the processability of chromium-based resins, but with improved stress crack resistance and topload strength for bottles and other blow molded products.

Ethylene-based polymers are characterized by a melt index less than 1 g/10 min, a density from 0.94 to 0.965 g/cm, a Mw from 100,000 to 250,000 g/mol, a relaxation time from 0.5 to 3 sec, and an average number of long chain branches (LCBs) per 1,000,000 total carbon atoms in a molecular weight range of 300,000 to 900,000 g/mol that is greater than that in a molecular weight range of 1,000,000 to 2,000,000 g/mol, or an average number of LCBs per 1,000,000 total carbon atoms in a molecular weight range of 1,000,000 to 2,000,000 g/mol of less than or equal to about 5 and a maximum ratio of &#x3b7;/3&#x3b7; at an extensional rate of 0.1 secfrom 1.2 to 10. These polymers have substantially no long chain branching in the high molecular weight fraction of the polymer, but instead have significant long chain branching in a lower molecular weight fraction, such that polymer melt strength and parison stability are maintained for the fabrication of blow molded products and other articles of manufacture. These ethylene polymers can be produced using a dual catalyst system containing a single or two atom bridged metallocene compound with two indenyl groups, and a single atom bridged metallocene compound with a fluorenyl group and a cyclopentadienyl group.

Disclosed embodiments include the formation of an article of manufacture by a process in which vibrations are generated in a bulk material disposed within a build chamber. The vibrations are focused within a section of the base material, and the focusing is controlled to cause the section of the base material to undergo a physical transformation to form at least a portion of the article of manufacture.

Phonon generation in bulk material for manufacturing

Disclosed embodiments include the formation of a manufacturing part by a process in which three-dimensional patterns of excitation are produced in a bulk material, and the three-dimensional patterns intersect to cause interference. The interference is used to perform physical or chemical conversion of the bulk material into an article of manufacture having a geometry corresponding to a three-dimensional projection produced from the intersection of the three-dimensional patterns.

System and method for writing an article of manufacture into bulk material

Disclosed herein are ethylene-based polymers having a higher molecular weight component and a lower molecular weight component, and characterized by a density greater than 0.945 g/cm, a melt index less than 1.5 g/10 min, and a ratio of high load melt index to melt index ranging from 40 to 175. These polymers have the processability of chromium-based resins, but with improved stiffness and stress crack resistance, and can be used in blow molding and other end-use applications.

Growing community of inventors

Collinsville, OK, United States of America

Alfred E Brown, Jr