Adhesive composition, adhesive, adhesive sheet, and optical member
A technology of optical components and adhesives, applied in the direction of adhesive types, ester copolymer adhesives, film/sheet adhesives, etc., to achieve the effect of excellent constant load peel resistance
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[0117] Hereinafter, although this invention is demonstrated more concretely based on an Example, this invention is not limited to these Examples. In the description of the following Examples and the like, "parts" means "parts by mass" unless otherwise specified.
[0118] [Mw, Mn]
[0119] For (meth)acrylic random polymers and (meth)acrylic triblock polymers, the weight average molecular weight (Mw) and Number average molecular weight (Mn).
[0120] · Measuring device: HLC-8320GPC (manufactured by Tosoh Co., Ltd.)
[0121] ·GPC string composition: the following four-column connections (all manufactured by Tosoh (stock))
[0122] (1) TSKgel HxL-H (guard column)
[0123] (2) TSKgel GMHxL
[0124] (3) TSKgel GMHxL
[0125] (4)TSKgel G2500HxL
[0126] ·Flow rate: 1.0mL / min
[0127] ·Column temperature: 40℃
[0128] ・Sample concentration: 1.5% (w / v) (diluted with tetrahydrofuran)
[0129] ·Mobile phase solvent: tetrahydrofuran
[0130] ·Standard polystyrene conversion
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Synthetic example 1～3
[0133] Add n-butyl acrylate (BA), acrylic acid (AA), 2-hydroxyethyl acrylate (2HEA), methyl Acrylic acid ester (MA), 100 parts of ethyl acetate was added, and it heated up to 80 degreeC, introducing nitrogen gas. Next, 0.1 part of tertiary butyl peroxy pivalate was added, and the polymerization reaction was performed at 80 degreeC for 6 hours in nitrogen atmosphere. After completion of the reaction, it was diluted with ethyl acetate to prepare a polymer solution having a solid content concentration of 30% by mass. Table 2 shows the properties of the obtained (meth)acrylic copolymer.
[0134] [Table 2]
[0135]
[0136] [Synthesis of (meth)acrylic block polymers]
Synthetic example 4
[0138] In a flask equipped with a stirring device, a nitrogen inlet pipe, a thermometer, and a reflux cooling pipe, add 50 parts by weight of methacrylate, bis[4-{ethyl-2-(hydroxyethyl)aminocarbonyl}-benzyl]tri The contents of the flask were heated to 80°C while introducing nitrogen gas into the flask with 10 parts by weight of thiocarbonate. Next, 0.03 parts by weight of AIBN fully substituted with nitrogen was added to the flask while stirring, and heating and cooling were performed for 2 hours so that the temperature of the contents in the flask could be maintained at 80°C. The 105°C nonvolatile content of the acrylic polymer obtained in this way was 99.5%. Next, after raising the temperature of the contents in the flask to 90°C, 50 parts by weight of butyl acrylate was dropped over 1 hour. Thereafter, heating and cooling were performed for 3 hours so that the temperature of the content in the flask could be maintained at 90° C., and finally 25 parts by weight of ethyl ace...
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