Black matrix in colour picture tubes and method of producing...

G - Physics – 03 – F

Patent

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Details

G03F 7/039 (2006.01) G03F 7/00 (2006.01) G03F 7/40 (2006.01) H01J 9/227 (2006.01) H01J 9/233 (2006.01) H01J 29/28 (2006.01)

Patent

CA 2216127

The invention concerns a black matrix in colour picture tubes, a positive photoresist composition, an agent for protecting a black matrix and a method of producing the latter. The object of the invention is to provide a black matrix which is produced by means of a positive photoresist composition, permits good structuring ability between exposed and unexposed regions, and reduces the method of producing the black matrix to a small number of technological steps. This object is achieved by obtaining a black matrix which consists of a light-absorbent matrix and can be produced from a positive photoresist composition consisting of a suspension which contains one or a plurality of compounds which indirectly or directly release gaseous compounds under the effect of light, a black pigment and suspension-stabilizing additives which enhance wetting and/or render the solution adhesive. The object is further achieved by obtaining an agent for protecting the light- absorbent matrix, which agent can be produced from a negative photoresist composition comprising a water-soluble organic polymer, a cross-linking actinic component, an alkylsilicate and water, said protecting agent having a pH of between 6 and 7.5.

L'invention concerne une matrice noire (black matrix) pour tubes image couleur, une composition de photorésist positif, un agent servant à protéger une matrice noire et un procédé permettant de produire ladite matrice. L'objectif de l'invention est l'obtention d'une matrice noire qui soit produite au moyen d'une composition de photorésist positif, qui présente une bonne aptitude à la structuration entre les zones exposées et non exposées, et dont le procédé de production se réduit à un petit nombre d'étapes technologiques. Cet objectif est atteint par le fait que l'on a obtenu une matrice noire qui consiste en une matrice absorbant la lumière et peut être produite à partir d'une composition de photorésist positif qui est constituée d'une suspension contenant un ou plusieurs composés qui libèrent, indirectement ou directement, des composés gazeux sous l'effet de la lumière, un pigment noir et des additifs de stabilisation de suspension qui améliorent le mouillage et/ou confèrent à la solution un pouvoir adhésif. Cet objectif est également atteint par le fait que l'on a obtenu un agent de protection de la matrice absorbant la lumière, agent qui peut être produit à partir d'une composition de photorésist négatif constituée d'un polymère organique hydrosoluble, d'un composant actinique de réticulation, un silicate d'alkyle et de l'eau, le pH de cet agent de protection étant compris entre 6 et 7,5.

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