Macdermid Imaging Technology

Macdermid, Incorporated

Joseph F Rach

Wayne M Gibbons

Douglas Leach

Albert Roshelli, Jr

Nicola Casaletto

Particular polyurethane photopolymers are disclosed as materials of construction in producing improved polishing pads. The polyurethane photopolymers are formed from a polyurethane prepolymer prepared from the reaction products of a first reactant selected from the group consisting of polyesters, polyethers, polybutadienes and mixtures of the foregoing with diisocyanates, further reacted with acrylates and/or methacrylates.

Polyurethane composition with (meth)acrylate end groups useful in the

A compressible printing plate is prepared by casting liquid photopolymerizable resin directly onto a compressible material having open cells on its surface. The photopolymerizable resin is incompletely cured by exposure to actinic radiation, preferably in the absence of a coverfilm covering the photopolymerizable resin. A further layer of photopolymerizable resin is then cast onto the incompletely cured resin, and the whole exposed to actinic radiation through an image-bearing transparency. A release composition may be placed between the image-bearing transparency and the photopolymerizable resin to provide for decreased adhesion therebetween. After development, an image-bearing laminate suitable as a printing plate for flexographic printing is obtained. The printing plate achieves excellent short and long term adhesion between the compressible layer and the photopolymer plate, without the necessity of a tie layer or adhesive therebetween.

Compressible printing plates and manufacturing process therefor

A method for curing a photosensitive resin composition includes use of an especially thin gauge protective cover film, preferably incorporating a coating to permit ease of removal after imaging. The method also uses a photosensitive resin composition incorporating a photospeed modified capping layer to selectively retard image growth during exposure. To eliminate undesirable defects in the cured photopolymer, a glass plate which had previously contacted and flattened the composition, is separated from the composition by at least 0.025 inches after partially curing the composition but prior to completely curing the composition. The partial cure of the composition is achieved by directing light to the composition from a source of actinic radiation positioned about 6 to 30 inches from the resin composition, where the actinic radiation has a wavelength of maximum intensity of about 365 to about 375 nm.

Process for imaging of liquid photopolymer printing plates

A printing plate laminate is formed of a carrier sheet, sticky back, a substrate and photopolymer layer. The substrate has a thickness of only about 0.2 mil to about 3 mil. The printing plate laminate can be formed from a process wherein photopolymerizable resin is coated onto a bilayer substrate, where one layer of the substrate is in contact with the photopolymer layer and has a thickness of about 0.2 mil to about 3 mil, and a second layer of the substrate has a thickness of about 4 mil to about 7 mil. A pressure sensitive adhesive lies between the first and second layers of the substrate, so that the second layer may be easily peeled away from the first layer after selectively curing and then developing the photopolymer layer.

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Newark, DE, United States of America

Joseph F Rach