# US 2025/0084285 A1 · Thermo-switchable pressure-sensitive adhesives > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0084285 A1 - Document ID: US20250084285A1 - Status: Published application - Kind: A1 - Application number: 18/830,163 - Filed: 2024-09-10 - Published: 2025-03-13 - Earliest claimed: 2023-09-11 - Assignees: Northeastern University - Applicants: Northeastern University - Inventors: Ruobing Bai; Qianfeng Yin; Yichen Wan - Web page: https://patentgrep.com/patent/US20250084285A1 ## CPC - C09J 7/385: {Acrylic polymers} - C09J 9/00: Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks (C09J7/00 takes precedence) - C09J 5/06: involving heating of the applied adhesive - C09J 11/04: inorganic - C09J 133/24: Homopolymers or copolymers of amides or imides - C08F 120/54: Amides {, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide} - C08K 3/041: {Carbon nanotubes} - C08K 3/22: of metals - C08K 3/346: {Clay} - C08K 3/36: Silica - C08K 2201/011: Nanostructured additives - 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) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract Disclosed are adhesive materials comprising a polymer and a filler; wherein a) if the temperature of the adhesive material is equal to or below a reference temperature, then the adhesive material adheres to an adherend; and b) if the temperature of the adhesive material is above the reference temperature, then the adhesive does not adhere to an adherend. Further disclosed are methods of making the adhesive materials. ## Claims ### Claim 1 An adhesive material, comprising a polymer and a filler; wherein the adhesive material has a temperature; and a) if the temperature of the adhesive material is equal to or below a reference temperature, then the adhesive material adheres to an adherend; and b) if the temperature of the adhesive material is above the reference temperature, then the adhesive does not adhere to an adherend. ### Claim 2 (depends on 1) The adhesive material of claim 1, wherein the polymer is an upper critical solution temperature (UCST) polymer or a lower critical solution temperature (LCST) polymer. ### Claim 3 (depends on 1) The adhesive material of claim 1, wherein polymer is selected from the group consisting of poly(sulfobetaine), poly(ethylene oxide), poly(vinyl methyl ether), hydrophobically modified poly(vinyl alcohol), poly(hydroxyethylmethacrylate), poly(acrylic acid), poly(uracilacrylate), poly((meth)acrylamide-co-N-acetylacrylamide), poly(N-acryloylasparagineamide, poly(N-acryloylglutamineamide, and poly(N-methacryloylasparagineamide), poly(N-isopropylacrylamide), poly(N,N-diethylacrylamide), poly(N-vinlycaprolactam), poly [2-(dimethylamino)ethyl methacrylate], poly(ethylene glycol), and poly(ethylene oxide). ### Claim 4 (depends on 1) The adhesive material of claim 1, wherein the polymer is selected from the group consisting of poly(N-isopropylacrylamide), poly(N-vinylcaprolactam), poly [2-(dimethylamino)ethyl methacrylate], poly [3-(dimethyl (4-vinylbenzyl)ammonium)propyl sulfonate], and poly([2-(methacryloyloxy)ethyl]dimethyl-[3-sulfopropyl]ammonium hydroxide). ### Claim 5 (depends on 1) The adhesive material of claim 1, wherein the polymer is poly(N-isopropylacrylamide). ### Claim 6 (depends on 1) The adhesive material of claim 1, wherein the filler comprises silica, silicate, metal oxide, carbon nanotube, or polymer. ### Claim 7 (depends on 1) The adhesive material of claim 1, wherein the filler comprises a nanoclay. ### Claim 8 (depends on 7) The adhesive material of claim 7, wherein the nanoclay is a phyllosilicate. ### Claim 9 (depends on 1) The adhesive material of claim 1, wherein the adhesive material comprises the filler and the polymer in a mass ratio of about 0.005 to about 1. ### Claim 10 (depends on 1) The adhesive material of claim 1, wherein the adhesive material comprises the filler and the polymer in a mass ratio of about 0.5. ### Claim 11 (depends on 1) The adhesive material of claim 1, wherein the reference temperature is about 10° C. to about 100° C. ### Claim 12 (depends on 1) The adhesive material of claim 1, wherein the reference temperature is about 32° C. ### Claim 13 (depends on 1) The adhesive material of claim 1, wherein the adhesive material adheres to an adherend when heated above the reference temperature after the adhesive has been subjected to a cycle of heating above the reference temperature and cooling below the reference temperature about 10 to about 30 times. ### Claim 14 (depends on 13) The adhesive material of claim 13, wherein the adhesive material has been subjected to the cycle of heating above the reference temperature and cooling below the reference temperature about 10 times. ### Claim 15 (depends on 1) The adhesive material of claim 1, wherein the adherend is selected from the group consisting of glass, polymer, silicone rubber, metal, and wood. ### Claim 16 (depends on 1) The adhesive material of claim 1, wherein the adhesive material further comprises about 10% to about 80% water by weight. ### Claim 17 (depends on 1) A method of making the adhesive material of claim 1, comprising a) combining the polymer, the filler, and a solvent, thereby producing a first solution; b) adding an initiator and an accelerator to the first solution, thereby producing a precursor solution; and c) casting the precursor solution, thereby producing the adhesive material. ### Claim 18 (depends on 17) The method of claim 17, wherein the solvent is water, the initiator is ammonium persulfate, and the accelerator is N,N,N′,N′-tetramethylethylenediamine. ### Claim 19 (depends on 17) The method of claim 17, wherein the precursor solution comprises: 1) the filler and the polymer in a mass ratio about 0.05 to about 1; 2) the initiator and the polymer in a mass ratio about 1×10−3 to about 1×10−2; and 3) the accelerator and the polymer in a mass ratio about 1×10−3 to about 0.1. ### Claim 20 (depends on 17) The method of claim 17, wherein the precursor solution comprises: 1) the filler and the polymer in a mass ratio about 0.5; 2) the initiator and the polymer in a mass ratio about 4×10−3; and 3) the accelerator and the polymer in a mass ratio about 7×10−2.