| 摘要 |
The invention describes a solvent mixture for photohardenable compositions, which includes (a) a first component having (i) a first constituent of (aa) a polar solvent of the formula R-OH, wherein R is a H or alkyl, or (aa') a monoalkylether or an alkylether ester of a glycol and (ii) a second constituent of an organic solvent having a boiling point in the range of from about 60 to 160.degree.C and comprising an aliphatic ketone, an alkanoic acid alkylester, a hydroxyalkanoic acid alkylester or a cyclic ether, in quantitative proportions selected to form a homogeneous mixture, and b) from about 0.1 to 8% by weight, relative to the total solvent mixture, of another solvent, the boiling point of which is higher than each individual boiling point of the constituents of the first component (a). The solvent mixture is used to obtain coating solutions layers which have a higher photosensitivity than corresponding layers prepared without the addition of component (b).
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