Asymmetrical multi-layered membrane for electroacoustic transducers

US9796160B2 · kind B2 · utility

Assignee

• tesa SE · DE

Inventors

• Bernhard Mussig · Seevetal, DE
• Yeliz Tepe · Hamburg, DE
• Michael Egger · Hamburg, DE

Key dates

• Filing date: Apr 25, 2013
• Grant date: Oct 24, 2017
• Expiry date: Oct 3, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31942
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A multi-layered laminate for producing membranes for electroacoustic transducers, comprises a first layer of a polyether ether ketone film having a heat of crystallisation of at least 15 J/g, a second layer (of a thermoplastic plastic film having a heat of crystallisation of no more than 5 J/g, and an adhesive layer arranged between the first and second layers. Alternatively, the first and second layers are defined by their shrinkage properties after 15 minutes at 200° C.: the first layer has shrinkage of more than 10% in at least one direction, and the second layer has shrinkage of less than 10% in the longitudinal and transverse directions. A laminate constructed in this manner exhibits lower fold formation when processed using multi-cavity thermoforming. The laminates are useful for the production of membranes for electroacoustic transducers.