Terpene ether developing solvent for photopolymerizable printing plates
Flexographic printing plates are produced by exposing the photopolymer plates to a light source and washing out (developing) the masked out, non-exposed areas with a solvent. The invention provides terpene ether solvents suitable for use in the development of photopolymer printing plates. The solvents, which include terpene ethers alone or mixed with co-solvents and/or non-solvents, are effective in developing a large number of different photopolymer printing plates and can produce images superior to those obtained with commercially available solvents currently used in such applications.
1. A method for the development of photopolymerizable flexographic relief printing plates comprising:
selecting a developing solvent, said developing solvent comprising at least one terpene ether; and
washing an exposed flexographic relief printing plate with said developing solvent.
2. The method of claim 1 , wherein the photopolymerizable flexographic relief printing plates is selected from the group consisting of block co-polymers of styrene and butadiene, block co-polymers of styrene and isoprene, co-polymers of butadiene and acrylonitrile, terpolymers of butadiene, acrylonitrile, and acrylic acid.
3. The method of claim 1 , wherein the developing solvent further comprising a co-solvent.
4. The method of claim 3 , wherein the co-solvent is selected from the group consisting of n-butanol, 2-ethoxyethanol, benzyl alcohol, ethanol, methanol, propanol, isopropanol, alpha terpineol, dipropylene glycol methyl ether, 2-butoxyethanol, and 2-(2-butoxyethoxy) ethanol, substituted cyclopentanol, substituted cyclohexanol, substituted cycloheptanol, cyclopentyl substituted alcohol, cyclohexyl substituted alcohol, and cycloheptyl substituted alcohol.
5. The method of claim 4 , wherein the substituted cyclohexanol is 4-ethycyclohexanol.
6. The method of claim 4 , wherein the substituted cyclopentanol is 2,3 dimethylcyclopentanol.
7. The method of claim 4 , wherein the cyclohexyl substituted alcohol is cyclohexylpropanol.
8. The method of claim 4 , wherein the cyclopentyl substituted alcohol is 4-cyclopentylpentanol.
9. The method of claim 1 , wherein the developing solvent further comprising a non-solvent.
10. The method of claim 9 , wherein the non-solvent is selected from the group consisting of aliphatic petroleum distillates, naphthas, paraffinic solvents, hydro-treated petroleum distillates, mineral oil, mineral spirits, ligroin, decane, octane, and hexane.
11. The method of claim 1 , wherein the developing solvent further comprising a co-solvent and a non-solvent.
12. The method of claim 11 , wherein the co-solvent is selected from the group consisting of n-butanol, 2-ethoxyethanol, benzyl alcohol, ethanol, methanol, propanol, isopropanol, alpha terpineol, dipropylene glycol methyl ether, 2-butoxyethanol, and 2-(2-butoxyethoxy) ethanol, substituted cyclopentanol, substituted cyclohexanol, substituted cycloheptanol, cyclopentyl substituted alcohol, cyclohexyl substituted alcohol, and cycloheptyl substituted alcohol.
13. The method of claim 11 , wherein the non-solvent is selected from the group consisting of aliphatic petroleum distillates, naphthas, paraffinic solvents, hydro-treated petroleum distillates, mineral oil, mineral spirits, ligroin, decane, octane, and hexane.
14. The method of claim 11 , wherein the terpene ether is present in an amount of about 50-70% by volume, the co-solvent is present in an amount of about 20-50% by volume, and the non-solvent is present in an amount of about 10-30% by volume.
15. The method of claim 1 , further comprising drying the flexographic relief printing plate to remove the developing solvent.