# US 11,444,236 B2 · Flexible polyoxymethylene-based piezoelectric composites > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,236 B2 - Document ID: US11444236B2 - Status: Granted - Kind: B2 - Application number: 16/749,359 - Filed: 2020-01-22 - Published: 2020-07-23 - Granted: 2022-09-13 - Earliest claimed: 2019-01-22 - Assignees: Sabic Global Technologies B.V. - Applicants: SABIC Global Technologies B.V. - Inventors: Meghna Markanday; Pradeep Singh; Arun Kumar Sikder; Theo Hoeks; Venkata Ramanarayanan Ganapathy Bhotla; Anantharaman Dhanabalan - Web page: https://patentgrep.com/patent/US11444236B2 ## CPC - H10N 30/852: {Composite materials, e.g. having 1-3 or 2-2 type connectivity} - G01L 1/16: using properties of piezoelectric devices - H10N 30/092: Forming composite materials - H10N 30/20: with electrical input and mechanical output, e.g. functioning as actuators or vibrators - H10N 30/206: {using only longitudinal or thickness displacement, e.g. d33 or d31 type devices} - H10N 30/302: {Sensors} - G06F 3/016: {Input arrangements with force or tactile feedback as computer generated output to the user} - H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A polymer composite thin film exhibiting piezoelectric properties may include a polymer matrix with base material of Polyoxymethylene (POM) and a piezoelectric additive of greater than approximately five (5) percent by weight of the polymer composite thin film. The piezoelectric additives may include BaTiO3 and KNN. The polymer composite thin film exhibits piezoelectric characteristics and may be used in electronic devices in piezoelectric actuators and piezoelectric sensors. ## Claims ### Claim 1 An apparatus, comprising: a polymer composite thin film exhibiting piezoelectric properties, comprising: a polymer matrix, in which the polymer matrix comprises polyoxymethylene (POM); and a piezoelectric additive comprising greater than approximately five (5) percent by weight of the polymer composite thin film. ### Claim 2 (depends on 1) The apparatus of claim 1, in which the polymer composite thin film is a mechanically-flexible thin film. ### Claim 3 (depends on 1) The apparatus of claim 1, in which the piezoelectric additive comprises an inorganic additive comprising of at least one of PZT-Lead Zirconium Titanate, BT-Barium Titanate, Zinc Oxide, Lithium-doped Potassium Sodium Niobate Rubidium-doped Potassium Sodium Niobate, Caesium-doped Potassium Sodium Niobate, and undoped Potassium Sodium Niobate (KNN). ### Claim 4 (depends on 1) The apparatus of claim 1, in which the piezoelectric additive comprises an inorganic additive comprising at least one of doped Potassium Sodium Niobate (KNN) and undoped Potassium Sodium Niobate (KNN) in combination with at least one of PZT-Lead Zirconium Titanate, BT-Barium Titanate and Zinc Oxide. ### Claim 5 (depends on 1) The apparatus of claim 1, in which the piezoelectric additive comprises Potassium Sodium Niobate (KNN), and wherein the piezoelectric additive comprises between thirty (30) and ninety-eight (98) percent by weight of the polymer composite film. ### Claim 6 (depends on 1) The apparatus of claim 1, in which the piezoelectric additive comprises Potassium Sodium Niobate (KNN) in combination with Lithium, and wherein the piezoelectric additive comprises between thirty (30) and ninety-eight (98) percent by weight of the polymer composite film. ### Claim 7 (depends on 1) The apparatus of claim 1, in which the piezoelectric additive comprises at least one of a zero-dimensional, and one-dimensional structural pattern and a two-dimensional structural pattern. ### Claim 8 (depends on 1) The apparatus of claim 1, in which the polymer composite thin film comprises at least one of inorganic Perovskites, processing aids, dispersing aids and heat stabilizers, antioxidants, flow modifiers, and plasticizers. ### Claim 9 (depends on 1) The apparatus of claim 1, in which the polymer composite thin film is part of a piezoelectric device. ### Claim 10 (depends on 9) The apparatus of claim 9, in which the piezoelectric device comprises at least one of a sensor and an actuator. ### Claim 11 (depends on 1) The apparatus of claim 1, in which the polymer composite thin film has a thickness of between 30 and 120 micrometers. ### Claim 12 (depends on 1) The apparatus of claim 1, in which the polymer composite thin film has a d33 value exceeding 5 pC/N. ### Claim 13 (depends on 1) The apparatus of claim 1, in which the polymer composite thin film has a modulus value exceeding 4.1 GPa. ### Claim 14 (depends on 1) A method of manufacturing the polymer composite thin film of claim 1. ### Claim 15 (depends on 14) The method of claim 14, in which the method of manufacturing comprises physical mixing of polyoxymethylene (POM) powder with the piezoelectric additive in proportions w/w percentage of the piezoelectric additive to the polyoxymethylene (POM). ### Claim 16 (depends on 14) The method of claim 14, in which the method of manufacturing further comprises melt-blending in an extruder the polyoxymethylene (POM) powder with the piezoelectric additive to form pellets of a polymer composite. ### Claim 17 (depends on 14) The method of claim 14, in which the method of manufacturing further comprises compression molding or film extrusion. ### Claim 18 (depends on 17) The method of claim 17, in which the compression molding is performed by hot-pressing the pellets to form the polymer composite thin film at a temperature exceeding 150 degrees Celsius. ### Claim 19 (depends on 1) A piezoelectric sensor comprising the polymer composite thin film of claim 1, in which the piezoelectric sensor is configured to generate an analog signal proportional to an amount of deflection applied to the piezoelectric sensor by a user. ### Claim 20 (depends on 19) The piezoelectric sensor of claim 19, in which the piezoelectric sensor is integrated in a mobile device.