Patent ID: 7099607

Claim:
The cartridge comprising: a first component part formed of a first styrene resin composition; and a second component part formed of a second styrene resin composition: wherein said cartridge is detachably mountable to a main body of an electrophotographic image forming apparatus, wherein said first component part and said second component part are joined at joint surfaces; wherein said joint surfaces are terpene-type-solvent-welded joint surfaces disposed in contact with or in proximity to each other during feeding of a terpene-type solvent to at least a portion thereof before solvent welding, wherein at least one of the joint surface of said first component part and the joint surface of said second component part is provided with unevenness to facilitate the feeding of the terpene-type solvent, wherein said unevenness has a depth of from 20 μm to 40 μm as average roughness Rz.