Patent ID: 6686036
Filing Date: 2004-02-03
Classification: C08L,H04R,Y10T

Abstract:
An injection molding material of a casing of an acoustic device, the material composed of a filler and a thermosetting resin, said filler comprising particles of a cellulose-based powdered material which causes said casing to have a higher internal vibration loss than if said cellulose based powder was not present, the cellulose powdered material having surfaces on which are immobilized particles of a fine powdered material harder and smaller in size than said particles of cellulose-based powdered material, said particles of fine powdered material deposited to the surfaces under a pre-set pressure to prevent exfoliation of the particles of cellulose-based powdered material, said material has a ratio of filler to thermosetting resin of 50 percent or less parts by weight.