United States Patent (19) 11 Patent Number: 4,820,674 Shiozawa Et Al
United States Patent (19) 11 Patent Number: 4,820,674 Shiozawa et al. 45) Date of Patent: Apr. 11, 1989 54 PROCESS FOR PREPARING A 58) Field of Search ....................... 502/169, 172, 230; HYDROSLYLATION CATALYST 556/479, 136; 549/206, 211 75 Inventors: Kouji Shiozawa, Saitama; Yoshiharu (56) References Cited Okumura, Tokyo; Chihiro Imai, U.S. PATENT DOCUMENTS Kanagawa; Nobukazu Okamoto, 3,220,972 11/1965 Lamoreaux ......................... 502/169 Saitama, all of Japan 3,624,119 11/1971 Rothe.................................. 502/169 73) Assignee: Toa Nenryo Kogyo Kabushiki Kaisha, 3,814,731 6/1974 Nitzsche .............................. 502/169 Tokyo, Japan Primary Examiner-Patrick P. Garvin Assistant Examiner-Elizabeth Irzinski 21 Appl. No.: 149,092 Attorney, Agent, or Firm-Wenderoth, Lind and Ponack 22 Filed: Jan. 27, 1988 57 ABSTRACT A process for preparing a hydrosilylation catalyst by 30 Foreign Application Priority Data dissolving chloroplatinic acid H2PtCl6 in a cyclic ether or cyclic ester containing at least 3 carbon atoms, and Jan. 29, 1987 JP Japan .................................. 62-18916 maintaining the resulting solution at a temperature of at (51 Int. Cl. .............................................. B01J 31/00 least 3O C. 52 U.S. Cl. .................................... 502/169; 502/172; 502/230 4. Claims, No Drawings 4,820,674 1. 2 the resulting solution at a temperature of at least 30 C., PROCESS FOR PREPARING A preferably from 50° to 120° C. HYDROSILYLATION CATALYST DETAILED DESCRIPTION OF THE BACKGROUND OF THE INVENTION INVENTION This invention relates to a process for preparing a A process for preparing a hydrosilylation catalyst hydrosilylation catalyst which is preferably used in according to the present invention will be fully de synthesizing a silane coupling agent and, more particu scribed hereinafter.
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