Roller for image forming apparatus
A roller for an image forming apparatus is provided. The roller includes a shaft rotatable on the basis of one axis, an elastic layer covering an outer circumference of the shaft, and a coating layer formed on the elastic layer. The coating layer is a material in which a mixture containing acryl polyol and ε-caprolactone polyol is cross-linked by isocyanate.
1. A roller for an image forming apparatus comprising:
a shaft;
an elastic layer covering an outer circumference of the shaft; and
a coating layer formed on the elastic layer, the coating layer including acryl polyol and ε-caprolactone polyol in a mixture cross-linked by isocyanate.
2. The roller as claimed in claim 1 , wherein a weight ratio of the acryl polyol to the ε-caprolactone polyol included in the coating layer is 90:10 to 10:90.
3. The roller as claimed in claim 1 , wherein the acryl polyol is ε-caprolactone-modified hydroxy acrylate.
4. The roller as claimed in claim 3 , wherein the ε-caprolactone-modified hydroxy acrylate is a compound represented by:
5. The roller as claimed in claim 1 , wherein the ε-caprolactone polyol is selected from the group consisting of polycaprolactone diol, polycaprolactone triol, and polycaprolactone tetraol.
6. The roller as claimed in claim 1 , wherein the coating layer further includes a conductive agent and a dispersing agent.
7. The roller as claimed in claim 6 , wherein the conductive agent is carbon black, and the dispersing agent is methyloxirane polymer with oxirane, mono (diethylamino) alkyl ether.
8. The roller as claimed in claim 6 , wherein the dispersing agent is included in the coating layer in 2 to 11 weight parts with respect to 100 total weight parts of the acryl polyol and the ε-caprolactone polyol.
9. The roller as claimed in claim 1 , wherein
the acryl polyol has a glass transition temperature (T g ) of 0° C. to 20° C., and
the ε-caprolactone polyol has a glass transition temperature (T g ) of −40° C. or less.
10. The roller as claimed in claim 1 , wherein the coating layer has a thickness of 0.5 μm to 50 μm.
11. The roller as claimed in claim 1 , wherein the coating layer contains beads including an acryl-based resin, a polyamide-based resin, a polyolefin-based, a silicon-based resin, a phenol-based resin, a polyurethane-based resin, a styrene-based resin, benzoguanamine, a polyfluorovinylidene-based resin, silica, or metal oxide powder.
12. The roller as claimed in claim 1 , wherein the elastic layer includes one or a combination of polyurethane, natural rubber, butyl rubber, nitrile rubber, polyisoprene rubber, polybutadiene rubber, silicon rubber, styrene-butadiene rubber, ethylene-propylenerubber, ethylene-propylene-diene rubber, chloroprene rubber, and acrylic rubber.
13. An image forming apparatus using the roller according to claim 1 .
14. An image forming apparatus comprising:
a photoreceptor to carry an electrostatic latent image formed thereon;
a developing roller configured to supply a toner to the photoreceptor; and
a charging roller configured to charge the photoreceptor,
wherein at least one of the developing roller and the charging roller is the roller according to claim 1 .
15. A roller for an image forming apparatus comprising:
a shaft;
an elastic layer covering an outer circumference of the shaft; and
a coating layer formed on the elastic layer, the coating layer including acryl polyol mixed with and cross-linked to ε-caprolactone polyol.
16. The roller as claimed in claim 3 , wherein the ε-caprolactone-modified hydroxy acrylate is hydroxyethyl methacrylate.
17. The roller as claimed in claim 3 , wherein the ε-caprolactone-modified hydroxy acrylate is hydroxyethyl acrylate.
18. The roller as claimed in claim 15 , wherein the acryl polyol is a compound represented by:
19. The roller as claimed in claim 15 , wherein the acryl polyol is hydroxyethyl methacrylate.
20. The roller as claimed in claim 15 , wherein the acryl polyol is hydroxyethyl acrylate.