| 摘要 |
PURPOSE:To improve vacuum moldability and simultaneously, to make it difficult to be hurt at the time of an assembling work by constituting one layer of a propylene resin layer, and the other layer of a mixture layer which specified resin, rubber and inorganic filler are mixed at a specified proportion, in a vibrating diaphragm for a speaker, consisting of two layers. CONSTITUTION:In the speaker diaphragm consisting of two layers, one layer is made of the propylene resin layer and the other layer is made of the mixture layer consisting of the propylene resin, high density ethylene resin, ethylene and propylene rubber, and the inorganic filler. The mixing proportion of the inorganic filler in the mixture is 20-40 weight %, and the mixing proportion of the high density ethylene resin is 5.0-15 weight %, and the mixing proportion of the ethylenepropylene rubber is 3.0-10 weight % and in addition the balance is propylene resin. The propylene resin used as the propylene resin layer is a propylene homopolymer. On the other hand, the propylene resin used for making the mixture layer is selected out of the random polymer of the block polymer of propylene and ethylene and/or alpha-olefine.
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