| 摘要 |
<p>PURPOSE:To produce a large quantity of a lead frame having uniform quality by making a photosensitive material to contain a diazo salt photosensitive resin and a lipophilic polymer compound insoluble in water and soluble in alkaline water. CONSTITUTION:A substrate made of copper, copper alloy, or nickel alloy is coated with a photosensitive material on both faces, it is dried, wound, or laminated to obtain a lead frame forming material. A diazo salt photosensitive resin and a lipophilic polymer compound insoluble in water and soluble in alkaline water are contained in the photosensitive material; or a light-dimerization type photosensitive composition is contained; or a negative type resist composition constituted of a resin insoluble in water and soluble in alkaline water, a compound generating acid when active light or radioactive rays are radiated, and a compound having at least one group capable of ross-linking by the action of acid is used for the photosensitive material. The working process is simplified, and the dust sticking problem and excessive loss can be avoided.</p> |
