초록 ▼

Imaging materials employing photosensitive microcapsules having improved film speed are disclosed wherein the microcapsules contain a photoinitiator system including an absorber, a coinitiator and an autoxidizer; the absorber is a compound such as an aromatic ketone, the coinitiator and the autoxidi

Imaging materials employing photosensitive microcapsules having improved film speed are disclosed wherein the microcapsules contain a photoinitiator system including an absorber, a coinitiator and an autoxidizer; the absorber is a compound such as an aromatic ketone, the coinitiator and the autoxidizer are different but may be compounds such as N,N-dialkylanilines; the coinitiator and autoxidizer are selected such that free radical generation and oxygen consumption occur with optimum efficiency thereby providing an imaging material having high film speed.

대표청구항 ▼

A photosensitive microcapsule having improved film speed comprising, as the internal phase, a photosensitive composition including a free radical addition polymerizable material, and a photoinitiator system, wherein said photoinitiator system includes an absorber, a coinitiator and an autoxidizer, s

A photosensitive microcapsule having improved film speed comprising, as the internal phase, a photosensitive composition including a free radical addition polymerizable material, and a photoinitiator system, wherein said photoinitiator system includes an absorber, a coinitiator and an autoxidizer, said absorber, said coinitiator and said autoxidizer being different, said coinitiator being a compound which is more efficient in yielding free radicals by interacting with said absorber than said autoxidizer and said autoxidizer being more efficient in yielding free radicals by interacting with oxygen or oxygen radicals than said co-initiator, the quantum efficiency of said photosensitive composition in reacting with oxygen being substantially greater than 1, wherein said absorber is an aryl ketone, said co-initiator is an N,N-dialkylaniline represented by the formula [Figure] (I) wherein R1 and R2 are the same or different and represent an alkyl group having 1 to 6 carbon atoms or a benzyl group; and x a substituent having a Hammett\s constant in the range of -0.9 to 0.7 and said autoxidizer is a thiol.