Patent ID: 6444378
Filing Date: 2002-09-03
Classification: G03F

Abstract:
A method of forming patterns on a substrate comprising the steps:applying waterborne photoimageable composition to a substrate and forming a film, said composition comprising between about 30 wt. % to about 98 wt. % of a waterborne dispersion of an aliphatic urethane acrylate oligomer, and between about 1 wt % to about 25 wt. % photoinitiator; allowing the film of the photoimageable substrate to dry; applying a mask to the film and irradiating the photopolymerizable film to form an image; and developing the film to form a pattern; wherein the aliphatic urethane acrylate oligomer has the following structure: CH2&boxH;C(R4)â€”C(O)â€”Oâ€”Aâ€”Oâ€”C(O)â€”NHâ€”Râ€”NHâ€”C(O)â€”Oâ€”R1â€”Oâ€”C(O)â€”NHâ€”Râ€”NHâ€”C(O)â€”Oâ€”CH2â€”C(CH3)(CO2H)â€”CH2â€”Oâ€”C(O)â€”NHâ€”Râ€”NHâ€”C(O)â€”Oâ€”R1â€”Oâ€”C(O)â€”NHâ€”Râ€”NHâ€”C(O)â€”NHâ€”R2â€”NHâ€”C(O)NHâ€”Râ€”NHâ€”Câ€”(O)â€”Oâ€”R1â€”Oâ€”Câ€”(O)â€”NHâ€”Râ€”NHâ€”C(O)â€”Oâ€”CH2C(CH3)(CO2H)â€”CH2â€”Oâ€”C(O)â€”NHâ€”Râ€”NHâ€”C(O)â€”Oâ€”R1â€”Oâ€”C(O)â€”NHâ€”Râ€”NHâ€”C(O)Oâ€”Aâ€”Oâ€”C(O)â€”C(R4)&boxH;CH2, R33NH+; wherein,R4 is H or CH3; A is â€”CH2â€”, â€”CH2CH2, â€”CH2(CH2)nCH2, or phenyl; R is â€”CH2â€”, â€”CH2CH2â€”, â€”CH2â€”(CH2)nâ€”CH2â€”, phenyl, isophorone, tetramethyl xylene or dicyclohexyl methane; R1 is â€”(CH2CH2OCH2CH2)mâ€”; R2 is â€”CH2â€”(CH2)nâ€”CH2; R3 is H, methyl, ethyl, n-propyl or n- butyl; n is 1 to 10 and m is 1 to 10.