EP0969330A1
Expired / Lapsed
EP
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Transparent film for electrophotography and toner image forming method using same
Assignee: Canon Inc
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Filing: 1999-07-01
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Granted: —
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Expires: 2019-07-01
Abstract
Abstract A transparent film for electrophotographic image formation thereon is formed of a transparent substrate, and a surface-coating layer disposed on at least one surface of the transparent film. The surface coating layer is characterized by exhibiting a contact angle of 55 - 90 deg. with pure water at 23 °C and a humidity of 50 %RH; containing an electronically conductive agent as a resistivity-adjusting agent; and exhibiting a surface resistivity of 1x10 8 - 1x10 12 ohm/□. As a result of the specified properties, the transparent film exhibits good toner image transfer characteristic and provides images free from transfer failure, such as hollow image dropout, thin image density or discharge pattern formation.
Inventors
- 👤 Jun Mochizuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 18:36
CPC Classifications
G; G03; G03G; G03G7/00; G03G7/0006; G03G7/0013; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/26; Y10T428/266; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
A transparent film for electrophotographic
image formation thereon, comprising a transparent
substrate, and a surface-coating layer disposed on at
least one surface of the transparent film; wherein
said surface coating layer exhibits a contact angle of 55 - 90 deg. with
pure water at 23 °C and a humidity of 50 %RH, contains an electronically conductive agent
as a resistivity-adjusting agent, and exhibits a surface resistivity of 1x10 8 -
1x10 12 ohm/□.
Claim 2
Dependent Claim
21 words
A transparent film according to Claim 1,
wherein said surface coating layer exhibits a contact
angle of 60 - 90 deg.
Claim 3
Dependent Claim
16 words
A transparent film according to Claim 1,
wherein said electronically conductive agent comprises
SnO 2 particles.
Claim 4
Dependent Claim
41 words
A transparent film according to Claim 1,
wherein said surface coating layer exhibits a
universal hardness of at last 150 N/mm 2 as measured at
a diamond indenter penetration of 1 µm in an
environment of 23 °C and 50 %RH.
Claim 5
Dependent Claim
23 words
A transparent film according to Claim 4,
wherein said surface coating layer exhibits a
universal hardness of at least 160 N/mm 2 .
Claim 6
Dependent Claim
24 words
A transparent film according to Claim 4,
wherein said surface coating layer has been subjected
to a heat treatment for providing the universal
hardness.
Claim 7
Dependent Claim
16 words
A transparent film according to Claim 1,
wherein said surface coating layer contains matting
agent particles.
Claim 8
Dependent Claim
15 words
A transparent film according to Claim 1,
wherein said transparent substrate comprises a
polyester film.
Claim 9
Dependent Claim
19 words
A transparent film according to Claim 1,
wherein said transparent substrate has a thickness of
50 - 200 µm.
Claim 10
Dependent Claim
28 words
A transparent film according to Claim 1,
wherein said electronically conductive agent is in
the form of particles having an average particle size
of at most 0.1 µm.
Claim 11
Dependent Claim
22 words
A transparent film according to Claim 7,
wherein said matting agent particles have an average
particle size of 1 - 20 µm.
Claim 12
Dependent Claim
45 words
An electrophotographic toner image forming
method, comprising: transferring a toner image on an
image-bearing member onto a transfer-receiving
material, and fixing the toner image on the transfer-receiving
material, wherein the transfer-receiving
material comprises a transparent film according to any
one of Claims 1 - 11.
Claim 13
Dependent Claim
56 words
A toner image forming method according to
Claim 12, wherein the toner image on the image-bearing
member is transferred onto the transfer-receiving
material while pressing the transfer-receiving
material against the toner image on the image-bearing
member by a contact transfer member supplied with a
bias voltage of a polarity opposite to that of the
toner image.
Claim 14
Dependent Claim
17 words
A toner image forming method according to
Claim 13, wherein said contact-transfer member is a
transfer roller.
References Cited (Backward Citations)
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