Image forming method and image forming apparatus

1. An image forming method, comprising:

forming an electrostatic latent image on an electrostatic latent image bearer;

developing the electrostatic latent image on the electrostatic latent image bearer with a toner to form a toner image;

transferring the toner image from the electrostatic latent image bearer onto a continuous resin film;

fixing the toner image on the continuous resin film with a heat roller or a heat belt,

wherein the toner contains a maleic-acid-modified polyolefin having a polypropylene block in a main chain, and a polyethylene block and a polybutene block, and

wherein the maleic-acid-modified polyolefin having a polypropylene block in the main chain has a weight average molecular weight of 60,000 or more.

2. The image forming method of claim 1 , wherein the weight average molecular weight is 80,000 or more.

3. The image forming method of claim 1 ,

wherein the toner includes yellow toner, cyan toner, magenta toner, and black toner,

wherein the yellow toner contains Pigment Yellow 185, the cyan toner contains a copper phthalocyanine pigment, and the magenta toner contains Pigment Red 122.

4. The image forming method of claim 3 , wherein a proportion of each pigment in each of the yellow toner, the cyan toner, the magenta toner, and the black toner is from 10% to 20% by mass.

5. The image forming method of claim 3 , wherein the transferring includes:

transferring the toner image from the electrostatic latent image bearer onto a continuous resin film via an intermediate image bearer.

6. An image forming apparatus, comprising:

an electrostatic latent image bearer;

an electrostatic latent image forming device configured to form an electrostatic latent image on the electrostatic latent image bearer;

a developing device accommodating a developer containing a toner, the developing device configured to develop the electrostatic latent image on the electrostatic latent image bearer with the developer to form a toner image;

a transfer device configured to transfer the toner image from the electrostatic latent image bearer onto a continuous resin film;

a fixing device configured to fix the toner image on the continuous resin film,

wherein the toner contains a maleic-acid-modified polyolefin having a main chain containing a polypropylene block and wherein the maleic-acid-modified polyolefin having a polypropylene block in the main chain has a weight average molecular weight of 60,000 or more and has a polyethylene block and a polybutene block.

7. The image forming method of claim 1 , wherein the weight average molecular weight is 60,000 to 100,000.

8. The image forming method of claim 1 , wherein the weight average molecular weight is 80,000 to 100,000.

9. The image forming method of claim 1 , wherein the maleic acid-modified polyolefin having a polypropylene block in the main chain has a maleic acid modification rate of from 0.5 to 8.0% by mass.

10. The image forming method of claim 1 , wherein the proportion of the maleic acid-modified polyolefin having a polypropylene block in the main chain in the toner is 1.0 to 20.0% by mass.

11. The image forming method of claim 1 , wherein the maleic acid-modified polyolefin having a polypropylene block in the main chain has a″ outflow temperature of from 95° C. to 150° C.

12. The image forming method of claim 1 , wherein the toner comprises wax as a release agent.

13. The image forming method of claim 12 , wherein the proportion of the wax in the toner is from 0.1 to 8.0% by mass.

14. The image forming method of claim 1 , wherein the weight average molecular weight is 60,000 to 200,000.