§
Luxuse
Patent Intelligence
Sign In
Patent US3959767A successfully refreshed from Google Patents.
← Back to Patent Explorer
EP0797127A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Semiconductive silicone rubber roller and method for the preparation thereof

Assignee: Shin-Etsu Polymer Co Ltd
•
Filing: 1997-03-14
•
Granted: —
•
Expires: 2017-03-14
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Disclosed is an improvement in a rubber roller as a developing roller in a electrophotographic printer of which the silicone rubber forming the rubber layer on and around a metallic core mandrel is electrically semiconductive. The printing characteristics and abrasion resistance of the rubber roller to ensure good durability of the rubber roller in printing services can be greatly improved by the irradiation treatment of the rubber surface with ultraviolet light having principal wavelengths of 253.7 nm and 184.9 nm in an irradiation dose of 1.2 to 76 J/cm 2 , preferably, in an oxygen-containing atmosphere to form an ultraviolet-hardened surface layer of which the rubber surface has a specified surface rough-ness.

Inventors

  • 👤 Tsuneo c/o Shin-Etsu Polymer Co. Ltd. Ohki
  • 👤 Shuji c/o Shin-Etsu Polymer Co. Ltd. Oguchi
  • 👤 Masahiro c/o Shin-Etsu Polymer Co. Ltd. Ikeda

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-23 09:43
CPC Classifications
F; F16; F16C; F16C13/00; B; B29; B29C; B29C59/00; B29C59/16; G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0818; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0827; B29K; B29K2083/00; B29L; B29L2031/00; B29L2031/32; B29L2031/324; G03G2215/00; G03G2215/08; G03G2215/0855; G03G2215/0858; G03G2215/0861; G03G2215/0863

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 134 words
In a rubber roller consisting of a core mandrel of a rigid electroconductive material and a tubular layer of a cured silicone rubber on and around the core mandrel, of which the silicone rubber has a volume resistivity in the range from 1×10 4 to 1×10 9 ohm·cm, the improvement which comprises having the outer surface of the silicone rubber layer subjected to irradiation with ultraviolet light having principal wavelengths of 253.7 nm and 184.9 nm in an ultraviolet irradiation dose in the range from 1.2 to 76 J/cm 2 relative to the energy of the ultraviolet light of 253.7 nm wavelength to form an ultraviolet-hardened surface layer having such a surface roughness that the irregularity amplitude Rz is at least 8 µm and the average irregularity distance Sm is not exceeding 50 µm.
Claim 2
Independent Claim 128 words
A method for the preparation of a rubber roller consisting of a core mandrel of a rigid electroconductive material and a tubular layer of a cured silicone rubber on and around the core mandrel, of which the silicone rubber has a volume resistivity in the range from 1×10 4 to 1×10 9 ohm·cm, which comprises the steps of: (a) forming, on and around a core mandrel of a rigid electroconductive material, a tubular layer of the cured silicone rubber; and (b) irradiating the outer surface of the silicone rubber layer with ultraviolet light having principal wavelengths of 253.7 nm and 184.9 nm in an ultraviolet irradiation dose in the range from 1.2 to 76 J/cm 2 relative to the energy of the ultraviolet light of 253.7 nm wavelength.
Claim 3
Dependent Claim 28 words
The method for the preparation of a rubber roller as claimed in claim 2 in which the ultraviolet irradiation in step (b) is performed in an oxygen-containing atmosphere.
Claim 4
Dependent Claim 31 words
The method for the preparation of a rubber roller as claimed in claim 2 in which the ultraviolet irradiation dose rate in step (b) is at least 10 mW/cm 2 .
Claim 5
Dependent Claim 33 words
The method for the preparation of a rubber roller as claimed in claim 2 in which the ultraviolet irradiation in step (b) is performed with a low-pressure mercury lamp as the light source.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag