Developing roller, process for its production, developing assembly and image forming apparatus
First Claim
Patent Images
1. A developing roller which comprises:
- a shaft member; and
an elastic layer which covers a peripheral surface thereof;
said developing roller having a surface layer, wherein said surface layer comprises a urethane resin composed of a reaction product of the following component (a) with alcohols comprising the following components (b) to (d) or the following components (b) and (e), and has a surface having a contact angle to ethylene glycol of from 60.0 degrees or more to 90.0 degrees or less and a contact angle to diiodomethane of from 30.0 degrees or more to 38.0 degrees or less;
(a) an isocyanate;
(b) an alcohol containing a unit represented by the following formula (1);
(c) an alcohol containing a unit represented by the following formula (2);
(d) an alcohol containing a unit represented by the following formula (3); and
(e) an alcohol containing a unit represented by the following formula (2) and a unit represented by the following formula (3);
wherein 1 represents a positive integer;
wherein m represents a positive integer;
wherein n represents a positive integer.
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Abstract
A developing roller having a surface layer which contains a urethane resin composed of a reaction product of an isocyanate with a group of specific alcohols and has a surface having a contact angle to ethylene glycol of from 60.0 degrees or more to 90.0 degrees or less and a contact angle to diiodomethane of from 30.0 degrees or more to 38.0 degrees or less. The developing roller is highly reliable as having controlled banding which is an image difficulty caused at the part of contact between the developing roller and a developer feed roller.
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Citations
13 Claims
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1. A developing roller which comprises:
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a shaft member; and an elastic layer which covers a peripheral surface thereof; said developing roller having a surface layer, wherein said surface layer comprises a urethane resin composed of a reaction product of the following component (a) with alcohols comprising the following components (b) to (d) or the following components (b) and (e), and has a surface having a contact angle to ethylene glycol of from 60.0 degrees or more to 90.0 degrees or less and a contact angle to diiodomethane of from 30.0 degrees or more to 38.0 degrees or less; (a) an isocyanate; (b) an alcohol containing a unit represented by the following formula (1); (c) an alcohol containing a unit represented by the following formula (2); (d) an alcohol containing a unit represented by the following formula (3); and (e) an alcohol containing a unit represented by the following formula (2) and a unit represented by the following formula (3); wherein 1 represents a positive integer; wherein m represents a positive integer; wherein n represents a positive integer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
said developing assembly is the developing assembly according to claim 9.
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12. A process for producing a developing roller comprising the steps of
covering a peripheral surface of a shaft member or an elastic layer with a composition containing the following component (a) and the following components (b) to (d) or the following components (b) and (e), and then allowing the component (a) to react with the components (b) to (d) or the components (b) and (e) to form a surface layer which has a surface having a contact angle to ethylene glycol of from 60.0 degrees or more to 90.0 degrees or less and a contact angle to diiodomethane of from 30.0 degrees or more to 38.0 degrees or less: -
(a) an isocyanate; (b) an alcohol containing a unit represented by the following formula (1); (c) an alcohol containing a unit represented by the following formula (2); (d) an alcohol containing a unit represented by the following formula (3); and (e) an alcohol containing a unit represented by the following formula (2) and a unit represented by the following formula (3); wherein l represents a positive integer; wherein m represents a positive integer; wherein n represents a positive integer. - View Dependent Claims (13)
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Specification