Membranes made of cast polyarylate film

• Main Authors: ULRICH SIEMANN, JURGEN NICK
• Format: Patent
• Language: English
• Published: 13.04.2006
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CYLINDERS; DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL PROCESSES OF COMPOUNDING; HEATING; LIGHTING; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PISTONS; PUBLIC ADDRESS SYSTEMS; SEALINGS; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; WEAPONS; WORKING-UP

Thermoformed diaphragms made of cast polyarylate films, having at least one polyarylate (PAR) having a structural unit of the formula (I): where each of R1, R2, R3, and R4, independently of the others, is hydrogen, C1-4-alkyl, C1-4-alkoxy, or halogen, and each of R5 and R6 independently of the other, is hydrogen, C1-4-alkyl, C1-4-alkoxy, phenyl, or halogen. The thermoformed diaphragms made of cast PAR films can be used as acoustic transducers, preferably as microphone diaphragms or loudspeaker diaphragms. The cast PAR films can be used for producing these diaphragms, and the PAR casting solutions can be used for producing the cast PAR films. There are processes for producing thermoformed diaphragms made of cast PAR films.