Manufacturing method of optical film
A manufacturing method and optical technology, applied in chemical instruments and methods, optics, optical components, etc., can solve problems such as different prevention of adhesion, no related description, etc., and achieve the effect of less defects such as scars and excellent surface condition
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[0096] Hereinafter, the present invention will be described in further detail through examples, but the present invention is not limited only to the following examples. In addition, unless otherwise specified, "part" and "%" are based on weight.
[0097] The evaluation of this Example was performed by the following method.
[0098] (1) Weight average molecular weight (Mw) and molecular weight distribution (Mw / Mn)
[0099]The molecular weights of the block copolymer [C] and the hydrogenated block copolymer [D] were measured at 38° C. as standard polystyrene-equivalent values of gel permeation chromatography (GPC) using THF as an eluent. As a measuring device, HLC8020GPC manufactured by TOSOH Corporation was used.
[0100] (2) Hydrogenation rate
[0101] determination 1 The H-NMR spectrum was used to calculate the hydrogenation rate of the main chain, side chain and aromatic ring of the block copolymer hydrogenated product [D].
[0102] (3) Glass transition temperature
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reference example 1
[0112] [Reference Example 1] Hydrogenated block copolymer [D1]
[0113] 550 parts of dehydrated cyclohexane, 50.0 parts of dehydrated styrene, and 0.475 parts of di-n-butyl ether were placed in a reactor equipped with a stirring device and sufficiently replaced with nitrogen inside. While stirring the entire contents at 60°C, 0.62 parts of n-butyllithium (15% cyclohexane solution) was added to start polymerization, and the entire contents were further stirred at 60°C for 60 minutes. As a result of measuring the reaction solution by gas chromatography, the polymerization conversion rate at this point was 99.5%.
[0114] Next, 30.0 parts of dehydrated isoprene was added to the reaction liquid, and stirring was continued for 30 minutes. The polymerization conversion rate at this point was 99.5%. Then, 20.0 parts of dehydrated styrene was further added, and it stirred for 60 minutes. The polymerization conversion at this point was almost 100%.
[0115] Here, 0.5 parts of isopr...
reference example 2
[0120] [Reference Example 2] Hydrogenated Block Copolymer [D2]
[0121] Divide styrene and isoprene into 5 times, sequentially add 40.0 parts of styrene, 10.0 parts of isoprene, 25.0 parts of styrene, 10.0 parts of isoprene and 15.0 parts of styrene, except Except that, the polymerization reaction was performed in the same manner as in Reference Example 1, and the reaction was terminated to obtain a polymer solution. The block copolymer [C2] contained in the polymer solution had a weight average molecular weight (Mw) of 70400, a molecular weight distribution (Mw / Mn) of 1.05, and wA:wB=80:20.
[0122] Next, hydrogenation reaction was carried out in the same manner as in Reference Example 1 using the above-mentioned polymer solution. The weight average molecular weight (Mw) of the hydrogenated block copolymer [D2] contained in the reaction liquid after hydrogenation reaction was 74700, and the molecular weight distribution (Mw / Mn) was 1.06.
[0123] After completion of the hyd...
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