# US 4,394,485 A · Four component adhesive blends and composite structures > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,394,485 A - Document ID: US4394485A - Status: Granted - Kind: A - Application number: 06/363,894 - Filed: 1982-03-31 - Granted: 1983-07-19 - Earliest claimed: 1982-03-31 - Assignees: Chemplex Company - Inventors: Ashok M. Adur - Web page: https://patentgrep.com/patent/US4394485A ## CPC - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 15/043: {of metal (B32B15/01 takes precedence)} - B32B 27/04: as impregnant, bonding, or embedding substance {(not used)} - B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE} - C09J 123/02: not modified by chemical after-treatment - B32B 2323/043: HDPE, i.e. high density polyethylene - B32B 2323/046: LDPE, i.e. low density polyethylene - B32B 2323/10: Polypropylene - C08L 2666/04: Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof - C08L 2666/24: Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract Compositions of matter having properties that make them strong adhesives to various substrates and especially for adhering polypropylene and polyethylene to various polar substrates. These compositions comprise blends of a graft copolymer of a polyethylene backbone grafted with at least one grafting monomer comprising one or more of polymerizable ethylenically unsaturated carboxylic acids of the anhydrides of such acids blended with a blending resin that is a mixture of one or more high density polyethylenes, one or more linear low density polyethylenes and one or more polypropylenes. The disclosure also includes composite structures comprising one or more substrates and a blend of the above as the adhesive in contact with the substrate or substrates and the method of preparing these composite structures. This invention relates to adhesive blends comprising modified polyolefin resins with improved adhesion to substrates and especially polar substrates such as metals, glass, paper, wood and polar polymers such as polyamides, polyureas, polycarbonates, polyurethanes, copolymers of olefins with vinyl esters and with vinyl alcohols, cellulose and its derivatives, etc. These adhesive blend resins can be used in any conventional process for combining dissimilar materials. Examples of these methods are lamination, coextrusion, powder and/or extrusion coating, blow molding, etc., or any combination of these processes. The adhesive blends of this invention also have excellent moisture-barrier properties. ## Claims ### Claim 1 A modified polyolefin blend consisting essentially of: (A) HDPE having a density of about 0.94-0.97 g/cc; (B) at least one polypropylene polymer or copolymer; (C) LDPE having a density of about 0.91-0.94 g/cc; and (D) a polyethylene polymer grafted with at least one grafting monomer polymerizable ethylenically unsaturated carboxylic acid or acid derivative. ### Claim 2 (depends on 1) The blend of claim 1 wherein said propylene polymer or copolymer comprises propylene homopolymers and copolymers of propylene and one or more unsaturated aliphatic hydrocarbons. ### Claim 3 (depends on 1) The blend of claim 1 wherein said polypropylene polymer comprises a copolymer of propylene and ethylene. ### Claim 4 (depends on 1) The blend of claim 1 wherein said grafting monomer comprises at least one of acrylic acid, methacrylic acid, fumaric acid, maleic acid, itaconic acid, citraconic acid, mesaconic acid, maleic anhydride, 4-methyl cyclohex-4-ene-1,2-dicarboxylic acid anhydride, bicyclo(2.2.2)oct-5-ene-2,3-dicarboxylic acid anhydride, 1,2,3,4,5,8,9,10-octahydronaphthalene-2,3-dicarboxylic acid anhydride, 2-oxa-1,3-diketospiro(4.4)non-7-ene, bicyclo(2.2.1)hept-5-ene-2,3-dicarboxylic acid anhydride, maleopimaric acid, tetrahydrophthalic anhydride, norborn-5-ene-2,3-dicarboxylic acid anhydride, Nadic anhydride, methyl Nadic anhydride, Himic anhydride, methyl Himic anhydride, and x-methyl bicyclo(2.2.1)hept-5-ene-2,3-dicarboxylic acid anhydride. ### Claim 5 (depends on 1) The blend of claim 1 wherein said unsaturated or saturated carboxylic acids or acid derivatives of (D) comprise the acids, metal salts of said acids, acid esters, acid anhydrides, acid amines, acid halides and acid derivatives of aliphatic, alicyclic, aromatic fused ring, heterocyclic moieties and copolymers containing one or more of these groups. ### Claim 6 (depends on 1) The blend of claim 1 wherein the polyethylene of (D) comprises ethylene homopolymers and copolymers of ethylene with one or more of butene, hexene, octene, 4-methyl pentene-1 or other unsaturated aliphatic or aromatic hydrocarbons in the density range 0.91 to 0.97 g/cc. ### Claim 7 (depends on 6) The blend of claim 6 wherein the polyolefin of (D) comprises linear polyethylenes. ### Claim 8 (depends on 1) The blend of claim 1 wherein said HDPE of (A) comprises an ethylene homopolymer and copolymers of ethylene with olefin monomers containing 3-15 carbon atoms. ### Claim 9 (depends on 8) The blend of claim 8 wherein said HDPE has a density of about 0.94-0.97 g/cc and a melt index of about 0.01-50 g/10 min. ### Claim 10 (depends on 1) The blend of claim 1 wherein the propylene polymer of (B) comprises propylene homopolymers, copolymers or terpolymers containing less than 40% of a polymerizable comonomer. ### Claim 11 (depends on 1) The blend of claim 1 wherein said LDPE of (C) comprises high pressure low density polyethylene or low pressure linear low density polyethylene, each having a density of about 0.91-0.94 g/cc and a melt index of 1.0-50 g/10 min.