公开(公告)号：JP2001139322A

公开(公告)日：2001-05-22

申请号：JP31860499

申请日：1999-11-09

Applicant: KAO CORP

Inventor： OKI KAZUO ,  HOSOKAWA KOJI ,  SAWADA TAKUYA ,  MIYAJI TAKASHI ,  SAKAGUCHI MIKIO

IPC: B01J20/18 ,  C01B39/02 ,  C11D3/12

Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing particulate zeolite consisting of crystalline alumino-silicate having an extremely small average primary grain size, a fast cation exchange rate, an extremely small average agglomeration grain size and excellent dispersibility by effecting the synthesis of zeolite in the presence of a compound containing alkaline earth metals. SOLUTION: This method for manufacturing the particulate zeolite consists in effecting the reaction in the presence of the compound containing the alkaline earth metals when manufacturing the zeolite by reacting a silica source and an aluminum source.

公开(公告)号：JPH11259847A

公开(公告)日：1999-09-24

申请号：JP5686598

申请日：1998-03-09

Applicant: KAO CORP

Inventor： ISHIKAWA JUNKO ,  HOSOKAWA KOJI ,  KOBAYASHI HIDEYUKI

IPC: G11B5/70

Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium improved in head wear characteristic without using a special polishing agent. SOLUTION: This magnetic recording medium is provided with an intermediate layer contg. powder and a binder on a base and a magnetic layer as the uppermost layer contg. ferromagnetic power, nonmagnetic powder and binder thereon. The ferromagnetic powder existing in a range within 2r determined by the following (a) is aigned at an average angle of

公开(公告)号：JPH11175953A

公开(公告)日：1999-07-02

申请号：JP33847797

申请日：1997-12-09

Applicant: KAO CORP

Inventor： HOSOKAWA KOJI ,  TAKESHIGE YUICHI ,  NAKAYAMA HIDEHIKO

IPC: C09D5/23 ,  C09D127/06 ,  C09D175/04 ,  G11B5/702 ,  G11B5/716

Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium of high density having excellent electromagnetic conversion characteristics and durability by preparing a coating material by stably dispersing a ferromagnetic powder suitable for high-density recording. SOLUTION: In this magnetic recording medium, an intermediate layer containing at least a magnetic powder and/or a non-magnetic powder and a binder is formed on a non-magnetic supporting body, and further, a magnetic layer as the uppermost layer containing at least a ferromagnetic powder and a binder is formed thereon. The binder used is the intermediate layer contains vinyl chloride polymer and/or polyurethane, and the OH stretching vibration frequency in H2 O measured by IR spectroscopy ranges in 3420 to 3490 cm .