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Developing roller, process for its production, developing assembly and image forming apparatus

  • US 7,727,134 B2
  • Filed: 10/20/2006
  • Issued: 06/01/2010
  • Est. Priority Date: 11/10/2005
  • Status: Active Grant
First Claim
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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);

    embedded image wherein 1 represents a positive integer;

    embedded image wherein m represents a positive integer;

    embedded image wherein n represents a positive integer.

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