title: [Studies on visible-light initiator system using thiobarbituric acid derivatives].
abstract: Experimental visible-light curing resins were prepared by the combination of dl-camphorquinone and a thiobarbituric acid derivative, such as 5-methyl-2-thiobarbituric acid (5 MS), 5-n-butyl-2-thiobarbituric acid (5 BS), and 1,3,5-trimethyl-2-thiobarbituric acid (135 MS). The ability of their initiator systems to polymerize resins was investigated and was also compared with that of initiator systems containing 5-n-butyl-barbituric acid (5 B) or N,N-dimethylaminoethyl methacrylate (DMAEMA) as the most popular reducing agent. The amount of insufficiently polymerized layer was small in 135 MS at a low concentration, and in DMAEMA at a high concentration, respectively. 135 MS was superior to DMAEMA in curing time, maximum exothermic rate and depth of cure at a concentration of 1.0 mole%. 135 MS, therefore, seemed comparable or superior to DMAEMA. The order of increasing activity as a reducing agent was 5 BS less than 5 MS less than DMAEMA less than or equal to 135 MS. When analogous 5 B and 5 BS were compared, the sulfur-containing 5 BS was more effective as a reducing agent.
authors.forename: Y
authors.initials: Y
authors.lastname: Kadoma
authors.forename: Y
authors.initials: Y
authors.lastname: Imai
mesh_terms: D000180:Acrylic Resins / Q000138:chemical synthesis*; D002384:Catalysis; D010084:Oxidation-Reduction; D011809:Quinones / Q000737:chemistry; D013858:Thiobarbiturates / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D011809:Quinones; D013858:Thiobarbiturates; C029684:thiobarbituric acid