Title:
DAMPING ADHESIVE LAYERS FOR MICROSPEAKER DIAPHRAGMS
Document Type and Number:
WIPO Patent Application WO/2019/071970
Kind Code:
A1
Abstract:
Thin films are provided comprising a damping adhesive comprising a polysiloxane or mixture of polysiloxanes and exhibiting a tan delta of at least 0.42 for every temperature between 20°C and 250°C and a tan delta at 250°C that is no more than 0.20 greater than the minimum tan delta measured in the range of 20°C to 250°C; in some cases exhibiting a tan delta of at least 0.42 for every temperature between 20°C and 200°C and a tan delta at 200°C that is no more than 0.08 greater than the minimum tan delta measured in the range of 20°C to 200°C; in some cases obtained by crosslinking polysiloxane(s) by e-beam or peroxide. Microspeaker diaphragm materials, subassemblies and transfer tapes comprising such films are also provided.
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Inventors:
YANG CHAO (CN)
WALKER CHRISTOPHER B (US)
O'NEAL DANIEL J (US)
WALKER CHRISTOPHER B (US)
O'NEAL DANIEL J (US)
Application Number:
PCT/CN2018/090071
Publication Date:
April 18, 2019
Filing Date:
June 06, 2018
Export Citation:
Assignee:
3M INNOVATIVE PROPERTIES CO (US)
YANG CHAO (CN)
YANG CHAO (CN)
International Classes:
C09J7/00; B32B25/04; B32B25/08; B32B27/06; B32B27/08; B32B27/16; C09J183/04; H04R7/06
Foreign References:
| CN103738020A | 2014-04-23 | |||
| CN107001877A | 2017-08-01 | |||
| CN102232103A | 2011-11-02 | |||
| CN102823274A | 2012-12-12 | |||
| US20080248274A1 | 2008-10-09 | |||
| US4678828A | 1987-07-07 |
Other References:
See also references of EP 3694943A4
Attorney, Agent or Firm:
TEE & HOWE INTELLECTUAL PROPERTY ATTORNEYS (CN)
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