Heat-fixing roll

摘要

A heat-fixing roll the surface of which is coated with a hardened coating of a silicone coating material composition containing the following materials (1A) and (1B) or (2A) through (2D), so as to be excellent not only in the heat resistance and releasability but also in the long-term adhesion propeties between a surface coating layer and a metal roll core or silicone rubber, and to be also high in the resistance to wear, is provided, wherein (1A) is organosiloxane consisting of a hydrolized condensation polymer of 20-200 parts by weight of silicone compound represented by a general formula Si(OR<1>)4 and colloidal silica, 100 parts by weight of silicone compound represented by a general formula R<2>Si(OR<1>)3, and 0-60 parts by weight of silicone compound represented by a general formula R<2> Si(OR<1>)2 (R<1>2 and R<2> being monovalent hydrocarbon radicals), the weight average molecular weight of which being controlled to be more than 800 in polystylene conversion, and (1B) is a straight-chain polysiloxanediol represented by a general formula HO(R<3>2SiO)nH (R<3> being a monovalent hydrocarbon radical and n>/=3); (2A) is a silica dispersed oligomer solution of organosilane prepared by partially hydrolyzing a hydrolyzable organosilane represented by a general formula R<4>mSiX4-m (R<4> being the same or different substituted or non-substituted monovalent hydrocarbon radicals of carbon number 1-8, m being an integer of 0-3, and X being a hydrolyzable group) within colloidal silica dispersed in an organic solvent, water or their mixture solvent, and under the conditions of employing water by 0.001-0.5 mol per 1 mol equivalent amount of the hydrolyzable group (X); (2B) is the same as (1B) above; (2C) is polyorganosiloxane containing in moleculars silanol group of an average composition formula R<5>aSi(OH)aO(4-a-b)/2 (R<5> being the same or different substituted or non-substituted monovalent hydrocarbon radicals of carbon number 1-8, and a and b being figures respectively satisfying the relationship 0.2