RFID bead label devices capable of withstanding and maintaining RFID operability for identification purposes during and post-vulcanization of rubber articles
Disclosed are pre-cure RFID-enabled bead labels based on an RFID inlay construction consisting of an aluminum antenna etched on to a high temperature resistant polyimide film that is connected to an integrated memory circuit positioned on the surface of the polyimide film. This RFID inlay being further inserted into an overall label construction having a plurality of layers that include, for example, a plurality of polyester layers and a plurality of high temperature resistant adhesive layers that bond/adhere layers together, the plurality of layers further protecting and insulating the RFID inlay while the label is bonded to the external bead (or sidewall) of a tire. The compositions/devices disclosed herein can be used for electronic identification when applied on rubber-based articles (e.g., tires) prior to being subjected to stress related to the vulcanization process and normal use of this article during the manufacturing process.
1. A RFID bead label device configured to be affixed to an unvulcanized rubber article and withstand and maintain RFID operability during vulcanization of the rubber article, the RFID bead label device comprising:
(a) a protective topcoat layer that is an outermost layer of the device;
(b) a rubber adhesion layer that is an innermost layer of the device and is configured to attach the device to the unvulcanized and/or vulcanized rubber article;
(c) a polyimide layer with a heat resistant RFID device positioned thereon or therein, the polyimide layer is positioned between the protective topcoat layer and the rubber adhesion layer such that the polyimide layer with heat resistant RFID capabilities maintains RFID operability during vulcanization and post-vulcanization of the rubber article; and
(d) a plurality of polyester layers positioned between the topcoat layer and rubber adhesion layer with at least a first polyester layer positioned above and at least a second polyester layer positioned below the polyimide layer such that the first and second polyester layers surround the polyimide layer to insulate, protect, and maintain RFID operability of the polyimide layer with heat resistant RFID capabilities during vulcanization of the rubber article.
2. The RFID bead label device of claim 1 , wherein the device maintains RFID operability between 300 MHz to 3 GHz pre-vulcanization, during vulcanization, and post-vulcanization of the rubber article.
3. The RFID bead label device of claim 1 , wherein the device maintains RFID operability while subjected to temperatures of up to 220° C. for up to 12 hours.
4. The RFID bead label device of claim 1 , wherein the polyimide layer with heat resistant RFID capabilities comprises a metallic antenna positioned thereon or therein configured for passive RFID transmission both transmitting and/or receiving radiofrequency signals ranging from 300 MHz to 3 GHz.
5. The RFID bead label device of claim 4 , wherein the metallic antenna is an aluminum etched antenna and integrated circuit or microchip configured for at least electronic communication, data memory, and control logic.
6. The RFID bead label device of claim 1 , further comprising a removable liner applied over and adhered to the rubber adhesion layer.
7. The RFID bead label device of claim 1 , further comprising a plurality of adhesive layers positioned between and bonding together the topcoat, the plurality of polyester, polyimide, and rubber adhesion layers.