# US 9,039,862 B2 · Bonding using hot-melt adhesives > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,862 B2 - Document ID: US9039862B2 - Status: Granted - Kind: B2 - Application number: 13/793,377 - Filed: 2013-03-11 - Published: 2013-07-25 - Granted: 2015-05-26 - Earliest claimed: 2010-09-27 - Assignees: Henkel AG & Co. KGaA - Applicants: Henkel AG & Co. Kgaa - Inventors: Juergen Lotz; Dirk Kasper; Lutz Pielert - Web page: https://patentgrep.com/patent/US9039862B2 ## CPC - C09J 123/12: Polypropene - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 15/08: of synthetic resin - B32B 29/002: {as the main or only constituent of a layer, which is next to another layer of the same or of a different material (next to a layer of a particular substance B32B9/06; next to a bituminous or tarry layer B32B11/06; next to a water-setting substance layer B32B13/08; next to a metal layer B32B15/12; next to a glass layer B32B17/065; next to a layer formed of natural mineral fibres or particles B32B19/046; next to a wood layer B32B21/06; next to a cellulosic plastic layer B32B23/06; next to a natural or synthetic rubber layer B32B25/06; next to a synthetic resin layer B32B27/10)} - C09J 123/142: {at least partially crystalline copolymers of propene with other olefins} - C08K 5/1345: {Carboxylic esters of phenolcarboxylic acids} - C08L 23/142: {at least partially crystalline copolymers of propene with other olefins} - C08L 91/06: Waxes - C08L 2205/02: containing two or more polymers of the same C08L -group - C08L 2666/02: Organic macromolecular compounds, natural resins, waxes or and bituminous materials - C08L 2666/04: Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof - Y10T 428/24843: with heat sealable or heat releasable adhesive layer - Y10T 428/263: Coating layer not in excess of 5 mils thick or equivalent - Y10T 428/2804: Next to metal - Y10T 428/2826: Synthetic resin or polymer - 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) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to the use of a hot-melt adhesive having high hardness for adhesive bonding of metal films or foils, paper films or foils, and/or plastic films or foils. The invention further relates to a method for adhesively bonding a metal film or foil, paper film or foil, and/or plastic film or foil onto a substrate. ## Claims ### Claim 1 A hot-melt adhesive comprising: (A) 10 to 80 wt % of at least one thermomechanically degraded polypropylene copolymer, (B) 5 to 60 wt % of at least one tackifying resin, (C) 0 to 40 wt % of at least one further additive, wherein the hot-melt adhesive has a Shore D hardness above 50 measured in accordance with DIN EN ISO 868:2003; wherein the components (A), (B) and (C) totals to 100 wt % of the hot-melt adhesive; and wherein the adhesive is adapted for bonding a film/foil selected from a metal film, metal foil, paper film, paper foil, plastic film or plastic foil. ### Claim 2 (depends on 1) The hot-melt adhesive according to claim 1, wherein the thermomechanically degraded polypropylene copolymer is manufactured by thermomechanical degradation of at least one polypropylene copolymer under shear stress above the softening point of the polypropylene copolymer, wherein the melt viscosity of the thermomechanically degraded polypropylene copolymer is less than 70% of the melt viscosity of the undegraded polypropylene copolymer, determined at 200° C. ### Claim 3 (depends on 2) The hot-melt adhesive according to claim 2, wherein the thermomechanical degradation is carried out in the presence of at least one radical former. ### Claim 4 (depends on 1) The hot-melt adhesive according to claim 1, wherein the thermomechanically degraded polypropylene copolymer has a propylene content of 50 to 99 wt %, based on the total weight of the thermomechanically degraded polypropylene copolymer. ### Claim 5 (depends on 1) The hot-melt adhesive according to claim 1, wherein the thermomechanically degraded polypropylene copolymer has an ethylene content of 1 to 25 wt %, based on of the total weight of the thermomechanically degraded polypropylene copolymer. ### Claim 6 (depends on 1) The hot-melt adhesive according to claim 1, wherein the thermomechanically degraded polypropylene copolymer has a melt viscosity, determined at 200° C., of 100 mPa·s to 200,000 mPa·s. ### Claim 7 (depends on 1) The hot-melt adhesive according to claim 1, wherein the softening point of the thermomechanically degraded polypropylene copolymer is between 80° C. and 170° C., measured in accordance with ASTM E-28. ### Claim 8 (depends on 1) The hot-melt adhesive according to claim 1, wherein the glass transition temperature (Tg) of the thermomechanically degraded polypropylene copolymer is less than 0° C. ### Claim 9 (depends on 1) The hot-melt adhesive according to claim 1 comprising at least two different thermomechanically degraded polypropylene copolymers, wherein the first thermomechanically degraded polypropylene copolymer has an enthalpy of fusion of 1 J/g to 50 J/g, and the second thermomechanically degraded polypropylene copolymer has an enthalpy of fusion from 55 J/g to 120 J/g, measured in accordance with DIN EN ISO 11357-3. ### Claim 10 (depends on 1) The hot-melt adhesive according to claim 1, wherein the hot-melt adhesive is substantially free of fillers. ### Claim 11 An article comprising at least one adhesive layer of a hot-melt adhesive on a film/foil selected from a metal film, metal foil, paper film, paper foil, plastic film or plastic foil, wherein the hot-melt adhesive comprises: (A) 10 to 80 wt % of at least one thermomechanically degraded polypropylene copolymer, (B) 5 to 60 wt % of at least one tackifying resin, (C) 0 to 40 wt % of at least one further additive, and the hot-melt adhesive has a Shore D hardness above 50 measured in accordance with DIN EN ISO 868:2003. ### Claim 12 (depends on 11) The article according to claim 11, wherein the adhesive layer is heat-activatable. ### Claim 13 (depends on 11) The article according to claim 11, wherein the adhesive layer has a thickness of 10 μm to 100 μm. ### Claim 14 (depends on 11) The article according to claim 11, wherein the film/foil is an imprinted single- or multi-layer. ### Claim 15 A method for adhesively bonding a film/foil onto a substrate, comprising the steps of: (A) applying a hot-melt adhesive, having a Shore D hardness above 50 measured in accordance with DIN EN ISO 868:2003, onto one surface of the film/foil to form a coated film/foil; (B) activating the coated film/foil; (C) bringing together the coated film/foil and a substrate; and then (D) bonding the coated film/foil to the substrate with simultaneous application of pressure and temperature; wherein the hot-melt adhesive comprises (1) 10 to 80 wt % of at least one thermomechanically degraded polypropylene copolymer, (2) 5 to 60 wt % of at least one tackifying resin, and (3) 0 to 40 wt % of further additives; and wherein the film/foil selected from a metal film, metal foil, paper film, paper foil, plastic film or plastic foil. ### Claim 16 (depends on 15) The method according to claim 15, wherein the bonding is carried out by compression with a roller. ### Claim 17 (depends on 15) The method according to claim 15, wherein the coated film/foil is heated to 120 to 150° C. in step (B). ### Claim 18 (depends on 17) The method according to claim 17, wherein the coated film/foil is heated to a temperature below the softening point of the hot-melt adhesive in step (B). ### Claim 19 (depends on 18) The method according to claim 18, wherein the coated film/foil is heated by radiative heat and/or by means of a heated roller. ### Claim 20 (depends on 15) The method according to claim 15, wherein the substrate is selected from shaped elements made of wood, metal or plastic. ### Claim 21 A hot-melt adhesive comprising: (A) 61 to 80 wt % of at least one thermomechanically degraded polypropylene copolymer, (B) 5 to 60 wt % of at least one tackifying resin, (C) 0 to 40 wt % of at least one further additive, wherein the hot-melt adhesive has a Shore D hardness above 50 measured in accordance with DIN EN ISO 868:2003; wherein the components (A), (B) and (C) totals to 100 wt % of the hot-melt adhesive; and wherein the adhesive is adapted for bonding a film/foil selected from a metal film, metal foil, paper film, paper foil, plastic film or plastic foil. ### Claim 22 (depends on 21) The hot-melt adhesive according to claim 21 comprising at least two different thermomechanically degraded polypropylene copolymers, wherein the first thermomechanically degraded polypropylene copolymer has an enthalpy of fusion of 1 J/g to 50 J/g, and the second thermomechanically degraded polypropylene copolymer has an enthalpy of fusion from 55 J/g to 120 J/g, measured in accordance with DIN EN ISO 11357-3.