# US 2018/0022071 A1 · Interlayer film for laminated glass, and laminated glass > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022071 A1 - Document ID: US20180022071A1 - Status: Published application - Kind: A1 - Application number: 15/549,089 - Filed: 2016-02-05 - Published: 2018-01-25 - Earliest claimed: 2015-02-05 - Assignees: Sekisui Chemical Co., Ltd. - Applicants: Sekisui Chemical Co., Ltd. - Inventors: Tatsuya Iwamoto; Nami Minakuchi - Web page: https://patentgrep.com/patent/US20180022071A1 ## CPC - B32B 17/10761: {containing vinyl acetal} - B32B 17/10036: {comprising two outer glass sheets} - B32B 17/10605: {Type of plasticiser} - B32B 17/10633: {Infrared radiation absorbing or reflecting agents} - B32B 27/20: using fillers, pigments, thixotroping agents - B32B 27/22: using plasticisers - B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers} - B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers} - B32B 27/08: of synthetic resin - B32B 2250/03: 3 layers - B32B 2307/102: Insulating - B32B 2307/30: having particular thermal properties - B32B 2307/308: Heat stability - B32B 2307/734: Dimensional stability - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM ## Abstract There is provided an interlayer film for laminated glass with which the production efficiency of laminated glass can be heightened. The interlayer film for laminated glass according to the present invention is an interlayer film for laminated glass having a one-layer structure or a two or more-layer structure and includes a first layer containing a thermoplastic resin, the softening point of the first layer is 60° C. or more, the interlayer film has an MD direction and a TD direction, and with regard to thermal shrinkage ratios obtained when the first inside portion, the second inside portion and the central portion are heated for 2 minutes at 80° C. respectively, all of the thermal shrinkage ratio MD1MAX, the thermal shrinkage ratio MD2MAX and the thermal shrinkage ratio MD3MAX are 18% or less. ## Claims ### Claim 1 An interlayer film for laminated glass having a one-layer structure or a two or more-layer structure, comprising a first layer containing a thermoplastic resin, the softening point of the first layer being 60° C. or more, the interlayer film having an MD direction and a TD direction, and with regard to thermal shrinkage ratios obtained when the following first inside portion, the following second inside portion and the following central portion are heated for 2 minutes at 80° C. respectively, all of the following thermal shrinkage ratio MD1MAX, the following thermal shrinkage ratio MD2MAX and the following thermal shrinkage ratio MD3MAX being 18% or less. a first inside portion: being represented as a section of 5 cm square which is a portion at a distance of 0.05× from one end in the TD direction toward the inside of the interlayer film when a distance between the one end and the other end in the TD direction of the interlayer film is defined as X a second inside portion: being represented as a section of 5 cm square which is a portion at a distance of 0.05× from the other end in the TD direction toward the inside of the interlayer film when a distance between the one end and the other end in the TD direction of the interlayer film is defined as X a central portion: being represented as a section of 5 cm square which is a portion at a distance of 0.5× from each of the one end and the other end in the TD direction toward the inside of the interlayer film when a distance between the one end and the other end in the TD direction of the interlayer film is defined as X a thermal shrinkage ratio MD1 MAX and a thermal shrinkage ratio MD1MIN: a thermal shrinkage ratio of a side higher in thermal shrinkage ratio and a thermal shrinkage ratio of a side lower in thermal shrinkage ratio respectively being defined as MD1MAX and MD1MIN in the case where two sides parallel to the MD direction of the first inside portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio of one side and a thermal shrinkage ratio of the other side respectively being defined as MD1MAX and MD1MIN in the case where two sides parallel to the MD direction of the first inside portion are the same in thermal shrinkage ratio a thermal shrinkage ratio MD2MAX and a thermal shrinkage ratio MD2MIN: a thermal shrinkage ratio of a side higher in thermal shrinkage ratio and a thermal shrinkage ratio of a side lower in thermal shrinkage ratio respectively being defined as MD2MAX and MD2MIN in the case where two sides parallel to the MD direction of the second inside portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio of one side and a thermal shrinkage ratio of the other side respectively being defined as MD2MAX and MD2MIN in the case where two sides parallel to the MD direction of the second inside portion are the same in thermal shrinkage ratio a thermal shrinkage ratio MD3MAX and a thermal shrinkage ratio MD3MIN: a thermal shrinkage ratio of a side higher in thermal shrinkage ratio and a thermal shrinkage ratio of a side lower in thermal shrinkage ratio respectively being defined as MD3MAX and MD3MIN in the case where two sides parallel to the MD direction of the central portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio of one side and a thermal shrinkage ratio of the other side respectively being defined as MD3MAX and MD3MIN in the case where two sides parallel to the MD direction of the central portion are the same in thermal shrinkage ratio ### Claim 2 (depends on 1) The interlayer film for laminated glass according to claim 1, wherein the softening point of the first layer is 615° C. or more. ### Claim 3 (depends on 1) The interlayer film for laminated glass according to claim 1, wherein the glass transition temperature of the first layer is 35° C. or more. ### Claim 4 (depends on 1) The interlayer film for laminated glass according to claim 1, further comprising a second layer containing a thermoplastic resin, the first layer being arranged on a first surface side of the second layer. ### Claim 5 (depends on 4) The interlayer film for laminated glass according to claim 4, wherein the thermoplastic resin in the first layer is a polyvinyl acetal resin and the thermoplastic resin in the second layer is a polyvinyl acetal resin. ### Claim 6 (depends on 5) The interlayer film for laminated glass according to claim 5, wherein the content of the hydroxyl group of the polyvinyl acetal resin in the first layer is larger by 9.5% by mole or more than the content of the hydroxyl group of the polyvinyl acetal resin in the second layer. ### Claim 7 (depends on 4) The interlayer film for laminated glass according to claim 4, wherein the second layer contains filler. ### Claim 8 (depends on 4) The interlayer film for laminated glass according to claim 4, further comprising a third layer containing a thermoplastic resin, the third layer being arranged on a second surface side at the opposite side of the first surface of the second layer. ### Claim 9 (depends on 1) The interlayer film for laminated glass according to claim 1, wherein the thermoplastic resin in the first layer is a polyvinyl acetal resin and the content of the hydroxyl group of the polyvinyl acetal resin in the first layer is 33% by mole or more. ### Claim 10 (depends on 1) The interlayer film for laminated glass according to claim 1, wherein the first layer contains a plasticizer and the content of the plasticizer in the first layer is 25 parts by weight or more and 35 parts by weight or less relative to 100 parts by weight of the thermoplastic resin in the first layer. ### Claim 11 (depends on 1) The interlayer film for laminated glass according to claim 1, wherein all of the thermal shrinkage ratio MD1MAX, the thermal shrinkage ratio MD2MAX and the thermal shrinkage ratio MD3MAX are 16% or less. ### Claim 12 (depends on 1) The interlayer film for laminated glass according to claim 1, wherein all of the thermal shrinkage ratio MD1MIN, the thermal shrinkage ratio MD2MIN and the thermal shrinkage ratio MD3MIN are 4% or more. ### Claim 13 (depends on 1) Laminated glass, comprising: a first lamination glass member; a second lamination glass member; and the interlayer film for laminated glass according to claim 1, the interlayer film for laminated glass being arranged between the first lamination glass member and the second lamination glass member.