The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 1976
Filed:
Dec. 26, 1973
Yoshihiro Osajima, Otake, JA;
Syoji Imao, Otake, JA;
Tokuo Shinomiya, Otake, JA;
Sirou Mihara, Otake, JA;
Michisuke Edamatsu, Yamaguchi, JA;
Mitsubishi Rayon Co., Ltd., Tokyo, JA;
Abstract
A process is disclosed whereby porous flakes usable for making paper-like sheets are produced by melting a 10 to 75 parts by weight of thermoplastic polymer, dispersing 25 to 90 parts by weight of finely divided inorganic particles in a solvent capable of dissolving the polymer in an amount of 80 to 95% based on a total weight of the polymer, the inorganic particles and the solvent, at room temperature or lower to prepare a slurry. At a temperature at which the polymer can be dissolved in the solvent, the polymer melt is mixed with the slurry which has been preliminarily heated to a temperature pertinent for realizing the above-mentioned dissolving temperature when the heated slurry is mixed with the polymer melt, to prepare a uniform dispersion of the inorganic particles in the polymer solution in the solvent and then, the dispersion is spurted from a closed tank through an orifice, into a zone having a temperature and pressure lower than that of the dispersion, whereby the spurted dispersion is converted to composite porous flakes by rapidly evaporating the solvent.