Electrophotographic endless belt, process for producing electrophotographic endless belt, and electrophotographic apparatus
First Claim
1. An electrophotographic endless belt comprising a resin layer formed of a resin composition containing a polyamide, wherein;
- said resin composition further contains a copolymer obtained by copolymerization of an olefin and an oxygen-containing heterocyclic compound;
a curve (T-log10 η
curve) showing the relationship between temperature T (°
C.) and common logarithm log10 η
of melt viscosity η
(Pa·
s), of said resin composition has, in the range of log10 η
of from log10 1,000 to log10 8,000, a gently inclined region the inclination Δ
log10 η
/Δ
T of which is from −
0.02 to 0, and the gently inclined region has a temperature range of 10°
C. or more; and
said resin layer has a thickness the maximum thickness of which is 115% or less of the average value of the thickness of said resin layer and the minimum thickness of which is 85% or more of the average value of the thickness of said resin layer.
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Accused Products
Abstract
In an electrophotographic endless belt having a resin layer formed of a resin composition containing a polyamide, the resin composition further contains a copolymer obtained by copolymerization of an olefin and an oxygen-containing heterocyclic compound, a curve (T-log10 η curve) showing the relationship between temperature T (° C.) and common logarithm log10 η of melt viscosity η (Pa·s), of the resin composition has, in the range of log10 η of from log10 1,000 to log10 8,000, a gently inclined region the inclination Δ log10 η/ΔT of which is from −0.02 to 0, and the gently inclined region has a temperature range of 10° C. or more, and the resin layer has a thickness the maximum thickness of which is 115% or less of the average value of the thickness of the resin layer and the minimum thickness of which is 85% or more of the average value of the thickness of the resin layer. Also disclosed is a process for producing the above electrophotographic endless belt.
17 Citations
19 Claims
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1. An electrophotographic endless belt comprising a resin layer formed of a resin composition containing a polyamide, wherein;
-
said resin composition further contains a copolymer obtained by copolymerization of an olefin and an oxygen-containing heterocyclic compound; a curve (T-log10 η
curve) showing the relationship between temperature T (°
C.) and common logarithm log10 η
of melt viscosity η
(Pa·
s), of said resin composition has, in the range of log10 η
of from log10 1,000 to log10 8,000, a gently inclined region the inclination Δ
log10 η
/Δ
T of which is from −
0.02 to 0, and the gently inclined region has a temperature range of 10°
C. or more; andsaid resin layer has a thickness the maximum thickness of which is 115% or less of the average value of the thickness of said resin layer and the minimum thickness of which is 85% or more of the average value of the thickness of said resin layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for producing an electrophotographic endless belt having a resin layer formed of a resin composition containing a polyamide;
- the process comprising the steps of;
extruding the resin composition from the interior of an extruder connected to a circular die, to the exterior of the extruder via the circular die to obtain a cylindrical product of the resin composition; and forming the cylindrical product of the resin composition into the resin layer of the electrophotographic endless belt; wherein; said resin composition further contains a copolymer obtained by copolymerization of an olefin and an oxygen-containing heterocyclic compound; a curve (T-log10 η
curve) showing the relationship between temperature T (°
C.) and common logarithm log10 η
of melt viscosity η
(Pa·
s) of said resin composition has, in the range of logon of from log10 1,000 to log10 8,000, a gently inclined region the inclination Δ
log10 η
/Δ
T of which is from −
0.02 to 0, and the gently inclined region has a temperature range of 10°
C. or more; andwhen said resin composition is extruded, said resin composition has temperature which is within the temperature range of said gently inclined region. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- the process comprising the steps of;
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19. An electrophotographic apparatus comprising an electrophotographic endless belt having a resin layer formed of a resin composition containing a polyamide, wherein;
-
said resin composition further contains a copolymer obtained by copolymerization of an olefin and an oxygen-containing heterocyclic compound; a curve (T-log10 η
curve) showing the relationship between temperature T (°
C.) and common logarithm log10 η
of melt viscosity η
(Pa·
s), of said resin composition has, in the range of log10 η
of from log10 1,000 to log10 8,000, a gently inclined region the inclination Δ
log10 η
/Δ
T of which is from −
0.02 to 0, and the gently inclined region has a temperature range of 10°
C. or more; andsaid resin layer has a thickness the maximum thickness of which is 115% or less of the average value of the thickness of said resin layer and the minimum thickness of which is 85% or more of the average value of the thickness of said resin layer.
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Specification