Edge material of vibration plate for electro-acoustic transducer, vibration plate for electro-acoustic transducer, vibration plate for microspeaker, film, and polyimide resin composition

• Main Author: HASUIKE, MASAYASU
• Format: Patent
• Language: Chinese; English
• Published: 16.08.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PUBLIC ADDRESS SYSTEMS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

Provided is an edge material of a vibration plate for an electro-acoustic transducer, containing a crystalline polyimide resin (A) comprising a tetracarboxylic acid component (a-1) and a diamine component (a-2) comprising mainly an aliphatic diamine. In addition, provided is a polyimide resin composition containing a polyetherimide resin (B) and the crystalline polyimide resin (A) comprising a tetracarboxylic acid component (a-1) and an aliphatic diamine component (a-2). The polyimide resin composition is characterized in that the content ratio of the polyetherimide resin (B) and the crystalline polyimide resin (A) is such that (B)/(A) = 1/99 to 99/1 on a mass basis.