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Karatsu T.,Chiba University | Narusawa M.,Chiba University | Yagai S.,Chiba University | Kitamura A.,Chiba University | And 2 more authors.
Journal of Photopolymer Science and Technology | Year: 2013

Three series of alkyl methacrylate based copolymers having photo-reactive side chains (C=C double bond) were synthesized and examined their performances as photopolymer in the presence of suitable oxime ester or triazine type radical photo-initiators for 365 nm light. Along to our previous report showed that correlation was observed between photochemical reactivity and chain length of the side chain/density of reactive side chain in the cyclohexyl methacrylate main chain. Our proposed mechanism is that sterically stacked nonpolar cyclohexyl groups may push out the polar reactive side chains, and length and density of the side chain controls cross linking between two reactive sites in the single main chain or two different main chains. Now we have examined structural effect of the alkyl groups on the efficiency of photocrosslinking. We have examined 5 series and totally 15 polymers. As a result, cyclohexyl methacrylate based copolymer showed excellent performance for polymerization. © 2013SPST. Source


Karatsu T.,Chiba University | Yoshimura Y.,Chiba University | Miura S.,Chiba University | Yagai S.,Chiba University | And 3 more authors.
Journal of Photopolymer Science and Technology | Year: 2011

Three series of cyclohexyl methacrylate based copolymers having photo-reactive side chains (C=C double bond) were synthesized and examined their performances as photopolymer in the presence of suitable oxime ester or triazine type radical photo-initiators for 365 nm light. As a result, those polymers gave negative patterns with micrometer resolution. Correlation between photochemical reactivity and chain length of the side chain/density of reactive side chain in the cyclohexyl methacrylate main chain was observed. Sterically stacked nonpolar cyclohexyl groups may push out the polar reactive side chain, and length and density of the side chain controls cross linking between two reactive sites in the single main chain or two different main chains. The image on a printing plate has enough strength for practical times of run off the print. These polymers were white or transparent powder having enough stability to preserve. Over all, three copolymers have promising features as photopolymer for printing. © 2011 CPST. Source

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