# US 2018/0022058 A1 · Interlayer for laminated glass, laminated glass, and production method for interlayer for laminated glass > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022058 A1 - Document ID: US20180022058A1 - Status: Published application - Kind: A1 - Application number: 15/551,631 - Filed: 2016-04-08 - Published: 2018-01-25 - Earliest claimed: 2015-04-10 - Assignees: Sekisui Chemical Co., Ltd. - Applicants: Sekisui Chemical Co., Ltd. - Inventors: Kazuhiko NAKAYAMA; Hiroshi KAWATE; Koji KIDO; Michiko MORI - Web page: https://patentgrep.com/patent/US20180022058A1 ## CPC - B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} - B29C 48/002: {combined with surface shaping} - B29C 59/04: using rollers or endless belts - B32B 17/10587: {created by embossing} - B32B 17/10761: {containing vinyl acetal} - B29C 48/08: flexible, e.g. films - B29C 48/919: {using a bath, e.g. extruding into an open bath to coagulate or cool the material} - B29K 2029/14: {Polyvinylacetals} - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS ## Abstract The present invention provides an interlayer film for a laminated glass which is easily peelable without autohesion even after storage in a stacked state, a laminated glass prepared using the interlayer film for a laminated glass, and a method for producing the interlayer film for a laminated glass. The present invention provides an interlayer film for a laminated glass, having a large number of recesses on at least one surface, the at least one surface having the recesses having an arithmetical mean height Sa of 200 nm or more as measured in conformity with ISO 25178. ## Claims ### Claim 1 An interlayer film for a laminated glass, having a large number of recesses on at least one surface, the at least one surface having the recesses having an arithmetical mean height Sa of 200 nm or more as measured in conformity with ISO 25178. ### Claim 2 (depends on 1) The interlayer film for a laminated glass according to claim 1, wherein the at least one surface having the recesses has an arithmetical mean height Sa of 250 nm or more as measured in conformity with ISO 25178. ### Claim 3 (depends on 1) The interlayer film for a laminated glass according to claim 1, wherein the large number of recesses on the at least one surface each have a groove shape with a continuous bottom. ### Claim 4 (depends on 3) The interlayer film for a laminated glass according to claim 3, wherein the recesses each having a groove shape with a continuous bottom are regularly adjacent and parallel to each other. ### Claim 5 (depends on 3) The interlayer film for a laminated glass according to claim 3, further having a large number of protrusions on the at least one surface having the recesses, wherein the surface has an arithmetical mean height Sa of 200 nm or more as measured for apexes of the protrusions in conformity with ISO 25178. ### Claim 6 (depends on 3) The interlayer film for a laminated glass according to claim 3, having a large number of recesses on both surfaces, wherein the recesses on both surfaces each have a groove shape with a continuous bottom, and an intersection angle θ between the recesses each having a groove shape with a continuous bottom on one surface and the recesses each having a groove shape with a continuous bottom on the other surface is 10° or more. ### Claim 7 (depends on 3) The interlayer film for a laminated glass according to claim 3, further having a large number of protrusions on each surface having the recesses, wherein the protrusions have a radius of rotation R of 200 μm or less. ### Claim 8 (depends on 1) The interlayer film for a laminated glass according to claim 1, wherein each surface having the recesses has a ten-point average roughness Rz of 10 μm or more as measured in conformity with JIS B 0601 (1994). ### Claim 9 (depends on 1) A laminated glass comprising: a pair of glass plates; and the interlayer film for a laminated glass according to claim 1 interposed between the pair of glass plates. ### Claim 10 An interlayer film for a laminated glass, having a large number of recesses and a large number of protrusions on at least one surface, the large number of recesses each having a groove shape with a continuous bottom, the surface has an arithmetical mean height Sa of 200 nm or more as measured for apexes of the protrusions in conformity with ISO 25178. ### Claim 11 (depends on 10) A laminated glass comprising: a pair of glass plates; and the interlayer film for a laminated glass according to claim 10 interposed between the pair of glass plates. ### Claim 12 (depends on 1) A method for producing the interlayer film for a laminated glass according to claim 1, the method comprising the step of: forming a large number of recesses on at least one surface of the interlayer film for a laminated glass by an embossing roll method using an embossing roll produced by a production process, the production process including: an embossing roll production step 1 of forming protrusions and recesses on a metal roll by blasting with an abrasive material, an embossing roll production step 2 of grinding a portion of each protrusion on the metal roll having the protrusions and recesses into a flat surface portion, and an embossing roll production step 3 of forming protrusions and recesses on the metal roll by blasting with an abrasive material finer than the abrasive material used in the embossing roll production step 1. ### Claim 13 (depends on 12) The method for producing the interlayer film for a laminated glass according to claim 12, wherein the abrasive material to be used in the embossing roll production step 3 has a grain diameter at a cumulative height of 3% in conformity with JIS R6001 (1998) of 150 μm or less, and a grain diameter at a cumulative height of 94% in conformity with JIS R6001 (1998) of 11 μm or more. ### Claim 14 (depends on 1) A method for producing the interlayer film for a laminated glass according to claim 1, the method being intended to form a large number of recesses on at least one surface of the interlayer film for a laminated glass by an embossing method in which melt fracture phenomena are controlled, the method comprising the steps of: extruding a resin composition for forming an interlayer film for a laminated glass from a die; and cooling the extruded interlayer film for a laminated glass in a cooling water tank, a distance between the die and the cooling water tank being adjusted to 250 mm or less in the cooling.