Irgacure 184

Example 20

Into light and dark brown glass bottles, 6.7 g of the PGM dispersions (15) and (16) of hydrophobic silica fine particles synthesized in Examples 15 and 16, 2.0 g of an acrylic monomer (SR351S (trimethylol propane triacrylate, manufactured by SARTOMER), SR492 (propoxylated trimethylol propane triacrylate manufactured by SARTOMER), SR444 (pentaerythritol triacrylate manufactured by SARTOMER), or KAYARD DPHA (dipentaerythritol hexaacrylate manufactured by Nippon Kayaku Co., Ltd.), 11.3 g of propylene glycol monomethyl ether, and 0.06 g of Irgacure 184 (photo radical polymerization initiator manufactured by BASF SE) were charged and stirred until the mixtures became uniform to obtain silica particle-containing compositions.

Example 19

Into light and dark brown glass bottles, 6.7 g of the MIBK dispersions (4), (5), and (6) of hydrophobic silica fine particles synthesized in Examples 4 to 6, 2.0 g of an acrylic monomer (SR351S (trimethylol propane triacrylate, manufactured by SARTOMER), SR492 (propoxylated trimethylol propane triacrylate manufactured by SARTOMER), SR444 (pentaerythritol triacrylate manufactured by SARTOMER), or KAYARD DPHA (dipentaerythritol hexaacrylate manufactured by Nippon Kayaku Co., Ltd.), 11.3 g of methyl isobutyl ketone, and 0.06 g of Irgacure 184 (photo radical polymerization initiator manufactured by BASF SE) were charged and stirred until the mixtures became uniform to obtain silica particle-containing compositions.

Example 11

The following ingredients were mixed, and the mixture was applied to have a thickness of 100 μm in such a manner that it was sandwiched between PET sheets having subjected to a mold release treatment on one side (available from Nippa Corporation, having a thickness of 50 μm) with a spacer interposed therebetween, and irradiated with ultraviolet rays at an irradiance of 3000 mJ/cm² using a chemical lamp (FL20SBL, available from TOSHIBA CORPORATION) to obtain the (meth)acrylic polymer (11).

Isobornyl Acrylate 65 Parts by Weight

Cyclic trimethylolpropane formal acrylate (#200) 25 parts by weight

(2-methyl-2-ethyl-1,3-dioxolan-4-yl)methyl acrylate (MEDOL-10) 5 parts by weight

4-hydroxybutyl acrylate (4HBA) 5 parts by weight IRGACURE 184 (available from BASF) 0.2 parts by weight

Example 3

Example 5

A semiconductor-related-member processing sheet was obtained by performing the same operation as in Example 1 except that the composition of the pressure sensitive adhesive composition in Example 1 was changed as follows:

i) as a polymerizable high-molecular compound (B2), 100 mass parts of a reaction product obtained by reacting methacryloyl oxyethyl isocyanate with an acrylic polymer (2-ethylhexyl acrylate/vinyl acetate/2-hydroxyethyl acrylate=40/40/20 (mass ratio), polystyrene equivalent weight-average molecular weight=550,000) so that the equivalent amount of the methacryloyl oxyethyl isocyanate would be 80% to the 2-hydroxyethyl acrylate;

ii) 8.75 mass parts of an epoxy group-containing compound (“Seikaseven SS02-063” available from Dainichiseika Color & Chemicals Mfg. Co., Ltd.);

iii) as a cross-linker (C), 1 mass part of an isocyanate component (“BHS-8515” available from TOYOCHEM CO., LTD.); and

iv) 3 mass parts of a photopolymerization initiator (“IRGACURE 184” available from BASF SE).

Example 1