| 摘要 |
A heat-fixing roll is coated with a hardened silicone coating composition containing such materials (1A) and (1B) or (2A) through (2D) as follows: (1A) organosiloxane consisting of a hydrolyzed condensation polymer of 20-200 parts by weight of silicon compound Si(OR1)4 and colloidal silica, 100 parts by weight of silicon compound R2Si(OR1)3, and 0-60 parts by weight of silicon compound R2Si(OR1)2 (R1 and R2 being monovalent hydrocarbon radicals), with the weight average molecular weight controlled to be more than 800 in polystyrene conversion, and (1B) a straight-chain polysiloxanediol HO(R32SiO)nH (R3 being a monovalent hydrocarbon radical, and n>/=3); or (2A) a silica dispersed oligomer solution of organosilane prepared by partially hydrolyzing a hydrolyzable organosilane R4mSiX4-m (R4 being the same or different substituted or non-substituted monovalent hydrocarbon radicals of carbon number 1-8, m being an integer 0-3, and X being a hydrolyzable group) within colloidal silica dispersed in an organic solvent, water or their mixture, employing water by 0.001-0.5 mol per 1 mol equivalent amount of the hydrolyzable group (X); (2B) the same as (1B); (2C) polyorganosiloxane containing, in molecules, silanol group R5aSi(OH)bO(4-a-b)/2 (R5 being the same or different substituted or non-substituted monovalent hydrocarbon radicals of carbon number 1-8, and a and b being figures satisfying 0.2</=a</=2, 0.0001</=b</=3 and a+b<4); and (2D) a curing catalyst; wherein the coated heat-fixing roll has excellent heat resistance, wear resistance, releasability, and long term adhesion between the coating and the heat-fixing roll.
|
