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Diazo light-sensitive copying composition and process of using in the manufacture of screen printing stencils

  • US 4,021,243 A
  • Filed: 01/22/1976
  • Issued: 05/03/1977
  • Est. Priority Date: 08/20/1970
  • Status: Expired due to Term
First Claim
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1. A process for the preparation of screen printing stencils, which comprises coating a screen printing support with a liquid light-sensitive composition comprising a hydrophilic hardenable binder in admixture with a condensation product comprising repeating units of each of the general types


  • space="preserve" listing-type="equation">A--N.sub.2 X and B
which are linked by methylene groups, in whichA is a radical of a compound of one of the general formulae


space="preserve" listing-type="equation">(R.sub.1 --R.sub.3 --).sub.p R.sub.2 --N.sub.2 X and ##STR1## wherein R.sub.1 is an arylene group of the benzene or naphthalene seriesR2 is a phenylene groupR3 is a single bond or one of the groups


space="preserve" listing-type="equation">--(CH.sub.2).sub.q --NR.sub.4 --


space="preserve" listing-type="equation">--o--(ch.sub.2).sub.r --NR.sub.4 --


space="preserve" listing-type="equation">--s--(ch.sub.2).sub.r --NR.sub.4 --


space="preserve" listing-type="equation">--s--ch.sub.2 --co--nr.sub.4 --


space="preserve" listing-type="equation">--o--r.sub.5 --o--


space="preserve" listing-type="equation">--o--


space="preserve" listing-type="equation">--s-- or


space="preserve" listing-type="equation">--CO--NR.sub.4 --the left-hand free valence of the specified groups is attached to R1 and the right-hand free valence is attached to R2wherein q is a number from 0 to 5 r is a number from 2 to 5R4 is selected from the group consisting of hydrogen, alkyl with 1 to 5 carbon atoms, aralkyl with 7 to 12 carbon atoms, and aryl with 6 to 12 carbon atoms,R5 is an arylene group having 6 to 12 carbon atoms--Y-- is one of the groups


space="preserve" listing-type="equation">--NH--, and --O--X is the anion of an aliphatic monosulfonic acid having 1 to 6 carbon atoms, and p is a number from 1 to 3, andB is a radical of a compound free of diazonium groups selected from the group consisting of aromatic amines, phenols, thiophenols, phenol ethers, aromatic thioethers, aromatic heterocyclic compounds, aromatic hydrocarbons and organic acid amides,which condensation product contains, on the average, about 0.01 to 50 B units per unit of A--N2 X,drying the light sensitive layer thus prepared,exposing the dried layer to light under a master, and removing the unexposed portions of the layer by treatment with an aqueous liquid.

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