Global Patent Index - EP 0716350 B1

EP 0716350 B1 2001-04-11 - Toner for developing electrostatic image

Title (en)

Toner for developing electrostatic image

Title (de)

Toner für die Entwicklung elektrostatischer Bilder

Title (fr)

Toner pour le développement d'images électrostatiques

Publication

EP 0716350 B1 (EN)

Application

EP 95308667 A

Priority

JP 32929894 A

Abstract (en)

[origin: EP0716350A2] A toner for developing electrostatic images includes (a) toner particles having a weight-average particle size of 1 - 9 mu m, (b) hydrophobized inorganic fine powder having an average particle size of 10 - 90 nm and (c) hydrophobized silicon compound fine powder. The hydrophobized silicon compound fine powder has an average particle size of 5 - 30 nm, and a particle size distribution such that it contains 15 - 45 % by number of particles having sizes of 5 - 30 nm, 30 - 70 % by number of particles having sizes of 30 - 60 nm and 5 - 45 % by number of particles having sizes of at least 60 nm. The hydrophobized silicon compound fine powder having a broad particle size distribution including coarse particles functions to prevent the embedding of the hydrophobized inorganic fine powder (functioning as a flowability improver) from being embedded at the toner particle surfaces, whereby the toner is allowed to exhibit stable performances even in a continuous image formation on a large number of sheets.

IPC 1-7 (main, further and additional classification)

G03G 9/08; G03G 9/097

IPC 8 full level (invention and additional information)

G03G 9/08 (2006.01); G03G 9/097 (2006.01)

CPC (invention and additional information)

G03G 9/09725 (2013.01); G03G 9/0825 (2013.01); G03G 9/09716 (2013.01)

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

EP 0716350 A2 19960612; EP 0716350 A3 19960911; EP 0716350 B1 20010411; CN 1084889 C 20020515; CN 1131284 A 19960918; DE 69520654 D1 20010517; DE 69520654 T2 20010906; HK 1012058 A1 20011207; KR 0163998 B1 19990320

INPADOC legal status


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2015-08-26 [GBPC] GB: EUROPEAN PATENT CEASED THROUGH NON-PAYMENT OF RENEWAL FEE

- Effective date: 20141201

2015-07-01 [REG DE R119] APPLICATION DEEMED WITHDRAWN, OR IP RIGHT LAPSED, DUE TO NON-PAYMENT OF RENEWAL FEE

- Document: DE 69520654

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2002-04-03 [26N] NO OPPOSITION FILED

2002-01-01 [REG GB IF02] EUROPEAN PATENT IN FORCE AS OF 2002-01-01

2001-05-25 [ET] FR: TRANSLATION FILED

2001-05-17 [REF] CORRESPONDS TO:

- Document: DE 69520654 20010517

2001-04-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE FR GB IT

2001-03-01 [ITF] IT: TRANSLATION FOR A EP PATENT FILED

- Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

1998-12-09 [17Q] FIRST EXAMINATION REPORT

- Effective date: 19981026

1997-03-26 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19970122

1996-09-11 [AK] DESIGNATED CONTRACTING STATES:

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1996-06-12 [AK] DESIGNATED CONTRACTING STATES:

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