Identity document with chip, e.g. ID card or driving license, includes buffer layer for preventing hairline cracks forming in plastic support

摘要

#CMT# #/CMT# A buffer layer (12) is provided between the chip (10) and plastic support (2), designed to compensate for any differences in shrinkage between the layer and chip when the processing temperature of the support is reduced to -40[deg]C, in order to prevent shrinkage tensions in the plastic material or reduce them in such a way that they do not result in the formation of hairline cracks. #CMT# : #/CMT# The document comprises a plastic support (2) in the form of e.g. a page or card. A chip with an antenna is accommodated mounted in the support. wherein between said chip and said plastics material there is arranged a buffer layer. An independent claim is also included for a chip with an antenna, designed for storing and providing personal information, which is mounted on a material with an effective thermal expansion coefficient greater than 0.0001 l/[deg]C. #CMT#USE : #/CMT# The document can be an ID card, bank pass, credit card, driving license or page of a passport. #CMT#ADVANTAGE : #/CMT# The formation of hairline cracks in the plastic support is prevented or reduced when the processing temperature of the support is reduced from 200[deg]C to -40[deg]C. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The figure shows a cross-section of the document. 2 : plastic support 10 : chip 12 : buffer layer #CMT#POLYMERS : #/CMT# The buffer layer comprises one or more materials chosen from polyethylene, polybutylene, polypropylene, acrylic resin, polyethylene glycol, polypropylene glycol, polyurethane, unsaturated polyester resin or epoxy resin.