Photocurable epoxy coating

Soucek, M. D. Wu, S. Chakrapani, S. Synthesis, Characterization, and Evaluation of Siloxane-Gontaing Modifiers for Photocurable Epoxy Coating Formulations. In Silicones and Silicone-Modified Materials-, Glarson, S. J., Fitzgerald, J. J., Owen, M. J., Smith, S. D., Eds. ACS Symposium Series 729 American Chemical Society Washington, DC, 2000 pp 516-532. 

Synthesis, Characterization, and Evaluation of Siloxane-Containing Modifiers for Photocurable Epoxy Coating Formulations... 

Para-t-butylphenyl glycidyl ether BPGE had a similar viscosity and C/O ratio as those of NA and had the best properties of the photocurable epoxies that were surveyed, but this monomer dewetted from Si substrates immediately after spin coating and formed a puddle at the substrate center. Other monofunctional epoxies exhibited the same behavior. Mixtures of BPGE with multifunctional aromatic epoxies wetted Si substrates and could be used as planarizing layers. 

Epoxy resins have been cured using a tris(ethyl acetoacetato) aluminium complex and tris (4-chloro-phenyl) (a-nitrobenzoy-loxy) silane.Resins produced by this catalyst mixture were found to have desirable electrical characteristics. N-vinyl-2-pyrrolidone is claimed to be a much superior resin than several acrylate diluents for photocured coatings... 

Ariga (45) disclosed developments with CTBN-modified epoxy acrylates which when prepared with other lower molecular weight dicarboxylic acids and select carboxyl-terminated oligopolyesters serve as novel oligomers for photocurable coatings. These systems have low uncured viscosity. In the cured state they possess excellent scratch and crosshatch adhesion, good direct and reverse impacts (duPont impact tester) and pass bending diameters of 2 mm. 

It Is well known that cationic polymerization may be Inhibited by nucleophilic species In the reaction mixture however, vinyl ethers appear to be less sensitive than epoxies to presence of nucleophiles. The high reactivity of the vinyl ether group with the growing cationic chain Is often favored over termination by a nucleophilic species. Water may act as a nucleophile and It has been reported that high atmospheric humidity conditions will Inhibit the photocuring of epoxles(24). We have observed a similar effect on vinyl ether based coatings. 

Crosslinked PVA compositions Photoconductive resins Anionic polymeric resist agents Derivative as epoxy resin hardeners Release coatings Photocurable resins Crosslinked, removable glass coatings... 

Because of the presenee of fluorinated free-dandling ehains in the HBP moleeule, we were interested in investigating the surface effect of the presenee of this additive in the photocurable formulations. Different epoxy formulations, in the presenee of different amount of HBP, were coated on a glass substrate and photocured. Contact angle measurements were performed on UV cured films. The data reported in table 10 show an inerease on hydiophobicity in the presenee of fluorinated HBP. 

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