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:
Dec. 06, 1994
Filed:
Apr. 13, 1993
Hiroshi Yanai, Kitakyushu, JP;
Tadayoshi Matsuo, Naokata, JP;
Masanori Nagase, Kitakyushu, JP;
Tsohikazu Maruyama, Kitakyushu, JP;
Toshihiko Furukawa, Kitakyushu, JP;
Katsuhiko Sakura, Kitakyushu, JP;
Yoshiaki Matsui, Kitakyushu, JP;
Takamasa Minami, Kitakyushu, JP;
Nobuo Moriya, Yokohama, JP;
Sachio Asaoka, Yokohama, JP;
Kouji Sakashita, Yokohama, JP;
Nobuyuki Suda, Yokohama, JP;
Keiji Shimoda, Yokohama, JP;
Susumu Yamamoto, Yokohama, JP;
Makoto Nomura, Yokohama, JP;
Nippon Steel Chemical Co., Ltd., Tokyo, JP;
Chiyoda Corp., Tokyo, JP;
Abstract
The invention relates to a process for preparing prilled bisphenol A by granulation which comprises adding compounds soluble in molten bisphenol A, not affecting adversely the melt color of bisphenol A to any significant extent, and have a melting point of 60.degree. C. or more to bisphenol A and granulating and also to a process which comprises adding the reaction mother liquor or cyrstallization mother liquor produced in the manufacturing step of bisphenol A to bisphenol A or the adduct of bispheol A and phenol or a mixture of bispheol A and phenol, removing the phenol, and granulating. The processes yield prilled bispheol A which have high strength and resist powdering.