Polymerizable composition for optical materials
By using a combination of thiocarbamate oligomers and pre-reaction catalysts in episulfide compounds, the problems of uneven refractive index, deformation and yellowing in optical materials are solved, and efficient manufacturing and performance improvement of optical materials are achieved .
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Embodiment 1
[0123] 75.0 parts by mass of bis(β-epithiopropyl) sulfide as compound (a), 11.3 parts by mass of tetramethyl metaxylylene diisocyanate as compound (b), and 13.7 parts by mass as compound (c) Mixture of metaxylylene dithiol and 0.025 parts by mass of pentamethylpiperidinyl methacrylate as compound (d), and perform thiocarbamation pre-reaction at 20°C for 16 hours, and pass through FT -IR confirmed that the consumption of the isocyanate group of the compound (b) was 80%. In addition, it was confirmed by FT-IR that the consumption of episulfide groups was less than 1%. In addition, the viscosity of the preliminary reaction liquid at 20°C was 50 cP. 0.025 parts by mass of tetrabutylphosphonium bromide as a polymerization catalyst, 0.01 parts by mass of dibutyltin dichloride as a polymerization regulator, and 1.0 parts by mass of 2-(2- Hydroxy-5-tert-octylphenyl) benzotriazole is made into a uniform polymerizable composition. The obtained polymerizable composition was subjected t...
Embodiment 2
[0126] 80.0 parts by mass of bis(β-epithiopropyl) sulfide as compound (a), 8.4 parts by mass of tetramethyl metaxylylene diisocyanate as compound (b), and 11.6 parts by mass as compound (c) M-xylylene dithiol, 0.025 parts by mass of pentamethylpiperidinyl methacrylate as compound (d), 1.0 parts by mass of 2-(2-hydroxy-5-tert-octyl as ultraviolet absorber) The phenyl)benzotriazole was mixed, and the thiocarbamation prereaction was performed at 25°C for 10 hours. It was confirmed by FT-IR that the consumption of the isocyanate group of the compound (b) was 76%. In addition, it was confirmed by FT-IR that the consumption of episulfide groups was less than 1%. In addition, the viscosity of the preliminary reaction liquid at 20°C was 45 cP. 0.020 parts by mass of tetrabutylphosphonium bromide as a polymerization catalyst was mixed with this preliminary reaction liquid to prepare a uniform polymerizable composition. The obtained polymerizable composition was subjected to degassing ...
Embodiment 3
[0129] 50.0 parts by mass of bis(β-epithiopropyl) sulfide as compound (a), 28.3 parts by mass of tetramethyl metaxylylene diisocyanate as compound (b), and 21.7 parts by mass as compound (c) M-xylylene dithiol, 0.050 parts by mass of pentamethylpiperidinyl methacrylate as compound (d), and 1.0 parts by mass of 2-(2-hydroxy-5-tert-octyl as ultraviolet absorber) The phenyl)benzotriazole was mixed, and the pre-reaction of thiocarbamation was performed at 30°C for 6 hours. It was confirmed by FT-IR that the consumption of the isocyanate group of the compound (b) was 70%. In addition, it was confirmed by FT-IR that the consumption of episulfide groups was less than 1%. In addition, the viscosity of the preliminary reaction liquid at 20°C was 80 cP. 0.025 parts by mass of tetrabutylphosphonium bromide as a polymerization catalyst and 0.02 parts by mass of dibutyltin dichloride as a polymerization regulator were mixed with this preliminary reaction solution to prepare a uniform polym...
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