# US 7,741,415 B2 · Process for producing low density polyethylene compositions and polymers produced therefrom > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,741,415 B2 - Document ID: US7741415B2 - Status: Granted - Kind: B2 - Application number: 11/666,527 - Filed: 2005-10-04 - Published: 2008-05-29 - Granted: 2010-06-22 - Earliest claimed: 2005-10-04 - Assignees: Dow Global Technologies LLC - Inventors: Christopher W. Conrad; David T. Gillespie; Christopher R. Eddy - Web page: https://patentgrep.com/patent/US7741415B2 ## CPC - C08F 110/02: Ethene - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract The present invention relates to an ethylene homo or copolymer characterized as having long chain branching, and having a molecular weight distribution, Mw/Mn, and a GPC-LALLS CDF, which satisfies the following relationship: y≧0.0663x−0.015, wherein y=GPC-LALLS CDF and x=Mw/Mn measured by conventional GPC, a line drawn from where the LS chromatogram intersects with molecular weight 350,000 and molecular weight 1,150,000 has a positive slope, preferably with a melt index between 0.15 and 2000 g/10 minutes and having long chain branching. In addition, the invention relates to a free radical initiation polymerization process for the preparation of ethylene polymers or copolymers, comprising reacting ethylene and optionally one or more comonomers at a high pressure, conveniently between 13,000 psig and 100,000 psig, and at reactor temperatures of 115° C. to 400° C., preferably 125-400° C., more preferably 140-350° C., especially 165-320° C., in a reactor system comprising at least one tubular, and at least one autoclave reactor, wherein the monomer(s) feed into the reactors is divided into multiple monomer feed streams, and wherein at least one feed stream into the tubular reactor consists essentially of unreacted monomer. ## Claims ### Claim 1 An ethylene homo or copolymer prepared in a high pressure radical initiated process using a chain transfer agent selected from the group consisting of saturated and unsaturated hydrocarbons, wherein the homo or copolymer is characterized as having long chain branching and having a molecular weight distribution, Mw/Mn, and a GPC-LALLS CDF, which satisfies the following relationship: y≧0.0663x−0.015, wherein y=GPC-LALLS CDF and x=Mw/Mn measured by conventional GPC; wherein a line drawn from where the LS chromatogram intersects with molecular weight 350,000 and molecular weight 1,150,000 has a positive slope; and wherein a film comprising the ethylene homo or copolymer has a microgel content of less than or equal to 3000 count, where microgels are defined as being in the range of 200-400 micron diameter gels per 50,000 square inches of film area. ### Claim 2 (depends on 1) The ethylene homo or copolymer according to claim 1, wherein the ethylene homo or copolymer has a melt index of from 0.15 to 2000 g/10 minutes, wherein the melt index is determined in accordance with ASTM D1238 condition (E) (190° C., 2.16 kg). ### Claim 3 (depends on 1) The ethylene homo or copolymer according to claim 1 having a GPC Mw and a zero shear viscosity (η0) (Pa*s) relationship of log(η0 (Pa*s))≦3.6607*log(GPC Mw)−14.678. ### Claim 4 (depends on 1) The ethylene homo or copolymer according to claim 1 having a melt strength of greater than or equal to about 75*(melt index)−0.6, wherein the melt index is determined in accordance with ASTM D1238 condition (E) (190° C., 2.16 kg). ### Claim 5 (depends on 1) The ethylene homo or copolymer according to claim 1 having a melt strength of greater than or equal to about 9.5*(melt index)−0.6, wherein the melt index is determined in accordance with ASTM D1238 condition (E) (190° C., 2.16 kg). ### Claim 6 (depends on 1) The ethylene homo or copolymer according to claim 1 having a melt strength of greater than or equal to about 11.5*(melt index)−0.6, wherein the melt index is determined in accordance with ASTM D1238 condition (E) (190° C., 2.16 kg). ### Claim 7 (depends on 1) The ethylene homo or copolymer according to claim 1 having a molecular weight distribution of between 2 and 7. ### Claim 8 (depends on 5) The ethylene homo or copolymer according to claim 5 having a molecular weight distribution of between 4 and 7. ### Claim 9 (depends on 1) The ethylene homo or copolymer of claim 1 in which the molecular weight distribution, Mw/Mn, and GPC-LALLS CDF satisfies the following relationship: y≧0.0663x−0.005. ### Claim 10 (depends on 1) The ethylene homo or copolymer of claim 1 in which the molecular weight distribution, Mw/Mn, and GPC-LALLS CDF satisfies the following relationship: y≧0.0663x−0.025. ### Claim 11 (depends on 1, 9) The ethylene homo or copolymer according to claims 1, 9, or 10, wherein the polymer has a melt index of from 0.15 to 20 g/10 minutes, wherein the melt index is determined in accordance with ASTM D1238 condition (E) (190° C., 2.16 kg). ### Claim 12 (depends on 1, 9) The ethylene homo or copolymer according to claims 1, 9, or 10, wherein the polymer has a melt index of from 0.2 to 8 g/10 minutes, wherein the melt index is determined in accordance with ASTM D1238 condition (E) (190° C., 2.16 kg). ### Claim 13 (depends on 1, 9) The ethylene homo or copolymer according to claims 1, 9, or 10, wherein the polymer has a density of from 0.91 g/cm3 to 0.935 g/cm3.