Light-sensitive composition and presensitized plate with light-sensitive diazo resin, acidic binder and compound with pivaloyl group
AssigneeFuji Photo Film Co., Ltd.
InventorsHiroshi Misu, Koichiro Aono, Yoshimasa Aotani
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Abstract
Light-sensitive compositions comprise a light-sensitive diazo resin, a binder and a compound having a pivaloyl group. Lithographic printing plates prepared by using the light-sensitive compositions of the invention are excellent in ink receptivity.
Claims14
A light-sensitive composition comprising a mixture of (i) about 3 to about 30 weight % of a light-sensitive diazo resin of a condensate of an aromatic diazonium salt and an active carbonyl compound, (ii) about 70 to about 97 weight % of a binder of a substantially water-insoluble and film-forming organic high molecular weight compound having an acid value of about 10 to about 200, and (iii) about 0.1 to about 50 weight % based on the binder of a compound having a pivaloyl group selected from the group consisting of pivaloyloxystryene unit- or pivaloyloxy-.alpha.-methylstryene unit-containing polymers, vinyl pivalate unit-containing polymers, pivalic esters of phenol resins, pivalic esters of a condensate of a polyphenol and a ketone, and bispivalic esters of bisphenols.
A presensitized plate having on an aluminum support a light - sensitive composition comprising a mixture of (i) about 3 to about 30 weight % of a light-sensitive diazo resin of a condensate of an aromatic diazonium salt and an active carbonyl compound, (ii) about 70 to about 97 weight % of a binder of a substantially water-insoluble and film-forming organic high molecular weight compound having an acid value of about 10 to about 200, and (iii) about 0.1 to about 50 weight % based on the binder of a compound having a pivaloyl group selected from the group consisting of pivaloyloxystryene unit-or pivaloyloxy-.alpha.-methylstryene unit-containing polymers, vinyl pivalate unit-containing polymers, pivalic esters of phenol resins, pivalic esters of a condensate of a polyphenol and a ketone, and bispivalic esters of bisphenols.
Dependencies are inferred from the claim text.