Patent ID: 9683108
Date: 2017-06-20
CPC Classifications: B05D,C08K,C09D,G02B,Y10T

Claim:
1. A process for producing an antireflective laminate that includes a light transparent base material and at least a low refractive index layer having a refractive index of not more than 1.45 provided on said light transparent base material, said process comprising: (1) preparing a composition for the low refractive index layer that comprises an ionizing radiation curing resin composition and silica fine particles having an outer shell layer with the interior of said silica fine particles being porous or void, (2) applying the composition on the light transparent base material to form a coating layer and drying the coating layer, and (3) irradiating the coating layer with an ionizing radiation and/or heating the coating layer to form the low refractive index layer, wherein said silica fine particles are obtained by the following steps (a) to (d): (a) adding an aqueous sodium silicate solution and an aqueous sodium aluminate solution to a silica raw material to prepare colloid particles comprising a composite oxide, (b) selectively removing at least a part of elements other than silicon and oxygen from the colloid particles of the composite oxide, (c) adding a hydrolytic organosilicon compound or a silicic acid liquid to the colloid particles from which a part of the elements has been removed to prepare a composite oxide sol, and (d) repeatedly carrying out a hydrothermal treatment of the composite oxide sol at temperatures of 50 to 300° C. to obtain silica fine particles having an Na