# US 2025/0154724 A1 · Method for producing laminate and method for producing molded article > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0154724 A1 - Document ID: US20250154724A1 - Status: Published application - Kind: A1 - Application number: 19/019,659 - Filed: 2025-01-14 - Published: 2025-05-15 - Earliest claimed: 2022-07-29 - Assignees: Kaneka Corporation - Applicants: Kaneka Corporation - Inventors: Itsuki KUSAKABE; Yasunori OKADA - Web page: https://patentgrep.com/patent/US20250154724A1 ## CPC - D21H 19/28: Polyesters - B32B 27/36: comprising polyesters - B65D 65/40: Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)} - B65D 65/42: Applications of coated or impregnated materials - C09D 167/04: Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C09D167/06 takes precedence) - D21H 25/06: of impregnated or coated paper (D21H25/08 takes precedence) - D21H 27/10: Packing paper (packaging materials of special type or form B65D65/38) - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES - 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 A method of forming a laminated article that includes a substrate and a resin layer. The method includes forming a coating on a substrate by applying an aqueous dispersion of a poly(hydroxyalkanoate) resin to the substrate. Subsequently, the resin layer is formed by fusing the poly(hydroxyalkanoate) resin by heating the coating. The coating can be heated using superheated steam to a surface temperature 10 to 100° C. above a melting point (Tm) of the poly(hydroxyalkanoate) resin. ## Claims ### Claim 1 A method for producing a laminate including a substrate and a resin layer formed on at least one side of the substrate, the method comprising: forming a coating on the substrate by applying an aqueous dispersion of a poly(hydroxyalkanoate) resin to the substrate; and forming the resin layer by fusing the poly(hydroxyalkanoate) resin through heating of the coating, wherein the coating is heated using superheated steam to a surface temperature 10 to 100° C. above a melting point Tm of the poly(hydroxyalkanoate) resin. ### Claim 2 (depends on 1) The method claim 1, wherein the substrate is paper. ### Claim 3 (depends on 1) The method of claim 1, wherein an amount measured in a dry weight per square meter of the applied poly(hydroxyalkanoate) resin divided by a weight per square meter of the substrate (the amount of the applied poly(hydroxyalkanoate) resin/the weight per square meter of the substrate) is from 0.05 to 0.45. ### Claim 4 (depends on 1) The method of claim 1, wherein the amount measured in the dry weight per square meter of the applied poly(hydroxyalkanoate) resin is from 1.0 to 80 g/m2. ### Claim 5 (depends on 1) The method of claim 1, wherein the weight per square meter of the substrate is from 40 to 400 g/m2. ### Claim 6 (depends on 1) The method of claim 1, wherein the poly(hydroxyalkanoate) resin is a poly(3-hydroxybutyrate) resin. ### Claim 7 (depends on 6) The method of claim 6, wherein the poly(3-hydroxybutyrate) resin comprises a copolymer of 3-hydroxybutyrate units and units of at least one hydroxyalkanoate other than 3-hydroxybutyrate. ### Claim 8 (depends on 7) The method of claim 7, wherein an average content of the 3-hydroxybutyrate units in the poly(3-hydroxybutyrate) resin is from 70 to 97 mol %. ### Claim 9 (depends on 7) The method claim 7, wherein units of at least one hydroxyalkanoate other than 3-hydroxybutyrate are 3-hydroxyhexanoate units. ### Claim 10 (depends on 1) The method of claim 1, further comprising drying the coating by heating the coating at a temperature lower than the melting point Tm of the poly(hydroxyalkanoate) resin before the step of forming the resin layer. ### Claim 11 (depends on 10) The method of claim 10, further comprising adjusting a moisture content of the substrate before forming the resin layer and after drying the coating. ### Claim 12 (depends on 1) The method of claim 1, further comprising adjusting a moisture content of the substrate after forming the resin layer. ### Claim 13 (depends on 1) The method of claim 1, wherein in a crystalline melting curve obtained by differential scanning calorimetry of the resin layer, the resin layer has at least one peak top temperature Tma in a range of 100 to 150° C. and at least one peak top temperature Tmb in a range of 150 to 170° C., and a difference between the temperatures Tma and Tmb is 10° C. or more. ### Claim 14 (depends on 1) A method for producing a molded article, the method comprising: producing a laminate by the method of claim 1; and molding the laminate into the molded article. ### Claim 15 (depends on 14) The method of claim 14, wherein the molded article is a packaging bag, a lidding material, or a container.