| 摘要 |
PURPOSE: A black matrix is manufactured to reduce process step by using positive photoresist component having distinct structural difference between light-exposition area and non-light-exposition area. CONSTITUTION: The invention relates to a black matrix in color picture tubes, a positive photoresist composition, an agent for protecting a black matrix, and a process for producing said black matrix. The invention is based on the object of providing a black matrix produced using a positive photoresist composition which permits good capability of structuring between exposed and non-exposed areas, and reducing the process for producing the black matrix to a few technological steps. Said object is achieved by means of a black matrix consisting of a light-absorbing matrix, which may be produced from a positive photoresist composition consisting of a suspension including one or more compounds which indirectly or directly release gaseous compounds on exposure to light, a black pigment and suspension-stabilizing and wetting-promoting and/or adhesion-promoting additives; and an agent for protecting the light-absorbing matrix, which may be produced from a negative photoresist composition consisting of a water-soluble organic polymer, a crosslinking actinic component, an alkyl silicate and water, said agent having a pH value of between 6 and 7.5.
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