Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1997-01-02
1998-12-29
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528310, 528322, 5283291, 528339, 528340, 528341, 524100, 524227, 524600, 524606, 419 32, 419 36, 419 37, 419 38, 419 41, 419 44, 419 53, 419 57, 264 63, 264344, 264645, 264656, 264657, 264670, C08G 7310, C08K 53477
Patent
active
058543791
ABSTRACT:
A low-cost thermal decomposition degreasing method capable of drastically reducing the time required for a degreasing process which involves heating, vaporization and thermal decomposition, while assuring the shape retention property of an injection molded product during degreasing. The degreasing process comprises: (i) a first step wherein a molded product placed under a reduced pressure less than or equal to atmospheric pressure is heated at a temperature lower than the melting point of a thermoplastic binder so that the thermoplastic binder partially evaporates by 5 wt % or more, and then the molded product is further heated at a temperature lower than higher one of the melting points of a more volatile organic compound and a thermoplastic resin whereby the thermoplastic binder further evaporates by 10 wt % or more, and wherein the final temperature is set to 200.degree. C. or less; and (ii) a second step wherein the molded product is heated to a temperature higher than or equal to the highest one of the melting points of thermoplastic binder components at a pressure higher than or equal to atmospheric pressure in an atmosphere of gas inert relative to a powder material constituting the molded product.
REFERENCES:
patent: 5059388 (1991-10-01), Kihara et al.
patent: 5531958 (1996-07-01), Krueger
patent: 5627258 (1997-05-01), Takayama et al.
Miyake Masato
Ohyama Yoshitaka
Okamura Kazuo
Ono Hiroshi
Saito Katsuyoshi
Hampton-Hightower P.
Kabushiki Kaisha Komatsu Seisakusho
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