A Photosensitive Polymer Having Benzoin Ether Side Chains: Poly(α-Methylolbenzoin Methyl Ether Acrylate)

Polymer-bound benzoin ether photoinitiators.

“…The following benzoin alkyl ethers (BAE-X) with functional substituents at a-position were prepared utilizing the reactive benzylic hydrogen of BAE photoinitiators (PT). They are a-(2-carboxyethyl )benzoin alkyl ethers (BAE-CA) [6], a-methylolbenzoin alkyl ethers (BAE-OH) [7] and a-(2-isocyanatoethyl)benzoin alkyl ethers (BAE-NCO) as shown in Scheme I. Two BE-NCO with methyl and isobutyl ether groups, in other word, a-(2-isocyanatoethyl)benzoin methyl ether (IEBME) and a-(2-isocyanatoethyl)benzoin isobutyl ether (IEBIBE), were synthesized by a procedure of the Curtius rearrangement [8] I Photopolym.…”

Photosensitizers and Photoinitiators

“…85 Ivanov and Khavina 86 reported that their data suggests a common character of synergism in photoinitiating systems that are composed of an aromatic ketone, a halomethyl aromatic compound, and an aliphatic or an aromatic amine. 87 Some examples of three component initiating compositions found in was carried out. 86 Combinations of several coumarin or ketocoumarin/additives with bisimidazole derivatives and mercaptobenzoxazole, or titanocene, or oxime esters were found to be capable of efficient initiating of free radical polymerizations.…”

“…87 Also, laser photolysis of polymers with side chains consisting of thioxanthene-9-one and morpholinokeone were shown to possess excitation energy for transfer from the thioxanthone to the morpholine groups as being two orders of magnitude greater than that of low molecular weight mixtures of these two componenets. An example is the work by Ahn and coworkers 87 who prepared polymers and copolymers from monomers prepared by the following reaction?…”

“…The inhibition period decreases with an increase in the number of chlorine substitution of acetic acid. 87 Such materials were already described in section 2.2.5. They believe that free-radical initiation is a result of a collapse of the exiplex (acid-dimethylaniline) and an electron transfer from the nitrogen to the carbonyl oxygen of the acid.…”

“…87 Fouaissier and Chesneau 136 reported that an eosine dye and ketocoumarin in the presence of an amine, acetone and iodonium salts initiate photocuring with light greater in wave length that 400 nm., The ketocoumarin (7-diethylamino-3,3'-oxydo-2H-chromen-2-one) was found by them to be a very useful additive to photo curable formulations, either in free-radical or in ionic curing processes. 87 Fouaissier and Chesneau 136 reported that an eosine dye and ketocoumarin in the presence of an amine, acetone and iodonium salts initiate photocuring with light greater in wave length that 400 nm., The ketocoumarin (7-diethylamino-3,3'-oxydo-2H-chromen-2-one) was found by them to be a very useful additive to photo curable formulations, either in free-radical or in ionic curing processes.…”