# US 12,215,214 B2 · Low density polyethylene with enhanced adhesion-to-aluminum foil by blending-in acid copolymer resins > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,214 B2 - Document ID: US12215214B2 - Status: Granted - Kind: B2 - Application number: 17/631,150 - Filed: 2020-07-27 - Published: 2022-08-25 - Granted: 2025-02-04 - Earliest claimed: 2019-07-31 - Assignees: Dow Global Technologies LLC - Applicants: Dow Global Technologies LLC - Inventors: Yifan Y. Dong; Jong Young Lee; Barry A. Morris; Teresa P. Karjala; Jianping Pan; Guihong Liao; I-Hwa Lee; Carmelo Declet Perez; Michael B. Biscoglio - Web page: https://patentgrep.com/patent/US12215214B2 ## CPC - C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond} - C09D 123/06: Polyethylene - C08L 2207/066: LDPE (radical process) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract The polymer blend includes at least 90% by weight low density polyethylene (LDPE) polymer and from 1% to 10% by weight acid copolymer based on the total weight of the polymer blend. In the polymer blend, the LDPE polymer has a melt index (I? 2 #191) from 2 g/10 min to 8 g/10 min as determined in accordance with ASTM D1238, and a molecular weight distribution from 5 to 10.5. In the polymer blend, the acid copolymer is a polymerized reaction product of: at least 60% by weight ethylene, based on the total weight of the monomers present in the ethylene acid copolymer; from 1% to 20% by weight monocarboxylic acid monomer, based on the total weight of the monomers present in the ethylene acid copolymer; and from 0 to 20% by weight alkyl acrylate monomer, based on the total weight of the monomers present in the ethylene acid copolymer. ## Claims ### Claim 1 A polymer blend comprising: at least 90% by weight low density polyethylene (LDPE) polymer based on the total weight of the polymer blend, the LDPE polymer having a melt index (12) from 2 g/10 min to 5.8 g/10 min as determined in accordance with ASTM D1238 (190° C., 2.16 kg), and a molecular weight distribution (MWD) from 5 to 10.5 as determined by a conventional gel permeation chromatography method; and from 1% to 10% by weight acid copolymer based on the total weight of the polymer blend, wherein the acid copolymer is a polymerized reaction product of: at least 65% by weight ethylene, based on the total weight of the monomers present in the ethylene acid copolymer; from 1% to 15% by weight monocarboxylic acid monomer, based on the total weight of the monomers present in the ethylene acid copolymer; and from 0 to 20% by weight alkyl acrylate monomer, based on the total weight of the monomers present in the ethylene acid copolymer. ### Claim 2 (depends on 1) The polymer blend of claim 1, wherein the LDPE polymer has a density of 0.910 g/cm3 to 0.935 g/cm3 and an MWD of 8.5 to 10.5. ### Claim 3 (depends on 1) The polymer blend of claim 1, wherein the melt index of the LDPE polymer is from 2 g/10 min to 4.5 g/10 min as determined in accordance with ASTM D1238 (190° C., 2.16 kg). ### Claim 4 (depends on 1) The polymer blend of claim 1, further comprising a linear low density polyethylene (LLDPE) polymer having a melt index (I2) from 0.5 g/10 min to 30 g/10 min as determined in accordance with ASTM D1238 (190° C., 2.16 kg), and a density of 0.910 g/cm3 to 0.935 g/cm3. ### Claim 5 (depends on 1) The polymer blend of claim 1, further comprising an ethylene copolymer having a melt index (I2) from 0.5 g/10 min to 30 g/10 min as determined in accordance with ASTM D1238 (190° C., 2.16 kg), wherein the ethylene copolymer comprises the reaction product of: at least 50% by weight ethylene, based on the total weight of the monomers present in the ethylene acid copolymer; and from 0.1% to 40% by weight comonomer, based on the total weight of the monomers present in the ethylene copolymer, the comonomer being chosen from vinyl acetate, acrylate, or carboxylic acid comonomer. ### Claim 6 (depends on 1) The polymer blend of claim 1, wherein the polymer blend comprises from 2% to 6% by weight acid copolymer, based on the total weight of the polymer blend. ### Claim 7 (depends on 1) The polymer blend of claim 1, wherein the acid copolymer has a melt index (I2) from 2 g/10 min to 30 g/10 min as determined in accordance with ASTM D1238 (190° C., 2.16 kg). ### Claim 8 (depends on 1) The polymer blend of claim 1, wherein the alkyl acrylate monomer comprises methyl acrylate, ethyl acrylate, n-butyl acrylate, iso-butyl acrylate, or combinations thereof; and the monocarboxylic acid monomer comprises acrylic acid, methacrylic acid, or combinations thereof. ### Claim 9 (depends on 1) The polymer blend of claim 1, wherein the ethylene acid copolymer comprises at least 75% by weight ethylene monomer, based on the total weight of the monomers in the ethylene acid copolymer; from 2% to 6% by weight monocarboxylic acid monomer, based on the total weight of the monomers in the ethylene acid copolymer; and from 1% to 15% by wt. alkyl acrylate based on the total weight of the monomers in the ethylene acid copolymer. ### Claim 10 (depends on 1) A coated metal substrate comprising: a metal substrate; and a coating comprising the polymer blend of claim 1 adhered to the metal substrate. ### Claim 11 (depends on 10) The coated metal substrate of claim 10, wherein the metal substrate comprises aluminum. ### Claim 12 (depends on 10) The coated metal substrate of claim 10, wherein the coating has peel strength of at least 0.6 N/in as measured by ASTM F904. ### Claim 13 (depends on 10) The coated metal substrate of claim 10, wherein the coating has peel strength of at least 1 N/in as measured by ASTM F904. ### Claim 14 (depends on 10) The coated metal substrate of claim 10, wherein the coating has peel strength of at least 2 N/in as measured by ASTM F904. ### Claim 15 (depends on 1) An extruded article comprising the polymer blend of claim 1. ### Claim 16 (depends on 1) The polymer blend of claim 1, wherein the LDPE polymer has a density of 0.910 g/cm3 to 0.920 g/cm3. ### Claim 17 (depends on 1) The polymer blend of claim 1, wherein the LDPE polymer is a homopolymer. ### Claim 18 (depends on 1) The polymer blend of claim 1, wherein the ethylene acid copolymer from 0 to 15% by weight alkyl acrylate monomer, based on the total weight of the monomers present in the ethylene acid copolymer. ### Claim 19 (depends on 1) The polymer blend of claim 1, wherein the ethylene acid copolymer comprises at least 75% by weight ethylene monomer, based on the total weight of the monomers in the ethylene acid copolymer. ### Claim 20 (depends on 1) The polymer blend of claim 1, wherein: the polymer blend comprises from 2% to 6% by weight acid copolymer, based on the total weight of the polymer blend; and the ethylene acid copolymer comprises at least 75% by weight ethylene monomer, based on the total weight of the monomers in the ethylene acid copolymer.