The sulfonium salt does not contain a toxic metal and exhibits higher cationic polymerization performance and crosslinking performance than a tetrakis(pentafluorophenyl)borate salt. The heat- or photo-acid generator contains the sulfonium salt. The sulfonium salt is formed of a sulfonium cation selected from a group represented by general formulas (1), (9), (10) and (11) described below and a gallate anion represented by formula (a). The heat- or photo-acid generator contains the sulfonium salt. The heat- or energy ray-curable composition contains the acid generator and a cationically polymerizable compound. A cured product can be obtained by curing the same. ##STR00001##

The sulfonium salt does not contain a toxic metal and exhibits higher cationic polymerization performance and crosslinking performance than a tetrakis(pentafluorophenyl)borate salt. The heat- or photo-acid generator contains the sulfonium salt. The sulfonium salt is formed of a sulfonium cation selected from a group represented by general formulas (1), (9), (10) and (11) described below and a gallate anion represented by formula (a). The heat- or photo-acid generator contains the sulfonium salt. The heat- or energy ray-curable composition contains the acid generator and a cationically polymerizable compound. A cured product can be obtained by curing the same. ##STR00001##

A radiation curable inkjet ink comprising a polymerizable compound and a photoinitiator, characterized in that the photoinitiator comprises a functional group selected from the group consisting of an aliphatic thio-ether and an aliphatic or a (hetero)aromatic disulfide.

The present invention discloses a PEGylated thioxanthone photoinitiator and a photosensitive resin composition, the PEGylated thioxanthone compound is eco-friendly and has low toxicity, high initiation efficiency and good thermal stability, meanwhile, as a kind of photoinitiator, the compound has a small amount of fragment residue after cured, and may improve the compatibility of the photoinitiator and photosensitive resin composition system. The photosensitive resin composition provided by the present invention has reasonable allocation of ingredients and content in the components thereof, capable of 3D-printing a hydrogel having a specific structure; the hydrogel has lower cytotoxicity and better biocompatibility, and may applied in bioengineering fields, e.g., 3D cell culture.

The present invention discloses a PEGylated thioxanthone photoinitiator and a photosensitive resin composition, the PEGylated thioxanthone compound is eco-friendly and has low toxicity, high initiation efficiency and good thermal stability, meanwhile, as a kind of photoinitiator, the compound has a small amount of fragment residue after cured, and may improve the compatibility of the photoinitiator and photosensitive resin composition system. The photosensitive resin composition provided by the present invention has reasonable allocation of ingredients and content in the components thereof, capable of 3D-printing a hydrogel having a specific structure; the hydrogel has lower cytotoxicity and better biocompatibility, and may applied in bioengineering fields, e.g., 3D cell culture.

A resist composition containing a compound represented by the general formula (bd1-1), (bd1-2) or (bd1-3); in the formula, Rx.sup.1 to Rx.sup.4 represent a hydrocarbon group or a hydrogen atom or may be mutually bonded to form a ring structure; Ry.sup.1 to Ry.sup.2 represent a hydrocarbon group or a hydrogen atom or may be mutually bonded to form a ring structure, Rz.sup.1 to Rz.sup.4 represent a hydrocarbon group or a hydrogen atom or may be mutually bonded to form a ring structure. At least one of Rx.sup.1 to Rx.sup.4, Ry.sup.1 to Ry.sup.2 and Rz.sup.1 to Rz.sup.4 has an anion group, M.sub.1.sup.m+ represents a sulfonium cation having a sulfonyl group, R.sup.001 to R.sup.003 each independently represent a monovalent organic group; provided that at least one of R.sup.001 to R.sup.003 is an organic group having an acid dissociable group; and M.sub.3.sup.m+ represents an m-valent organic cation having an electron-withdrawing group. ##STR00001##

A resist composition containing a compound represented by the general formula (bd1-1), (bd1-2) or (bd1-3); in the formula, Rx.sup.1 to Rx.sup.4 represent a hydrocarbon group or a hydrogen atom or may be mutually bonded to form a ring structure; Ry.sup.1 to Ry.sup.2 represent a hydrocarbon group or a hydrogen atom or may be mutually bonded to form a ring structure, Rz.sup.1 to Rz.sup.4 represent a hydrocarbon group or a hydrogen atom or may be mutually bonded to form a ring structure. At least one of Rx.sup.1 to Rx.sup.4, Ry.sup.1 to Ry.sup.2 and Rz.sup.1 to Rz.sup.4 has an anion group, M.sub.1.sup.m+ represents a sulfonium cation having a sulfonyl group, R.sup.001 to R.sup.003 each independently represent a monovalent organic group; provided that at least one of R.sup.001 to R.sup.003 is an organic group having an acid dissociable group; and M.sub.3.sup.m+ represents an m-valent organic cation having an electron-withdrawing group. ##STR00001##

The present invention discloses a triphenylsulfonium salt compound as shown in the general formula (I), wherein R.sub.1 represents an electron-withdrawing group and R.sub.2 represents an amplification group. Said compound shows significantly enhanced solubility and photosensitivity compared with unsubstituted triphenylsulfonium salts, and has significantly advantageous performance compared with prior art improved substitutes. ##STR00001##

Provided are a novel sulfonium salt having high photosensitivity to g-rays or h-rays; a novel photoacid generator containing a sulfonium salt that has high photosensitivity to g-rays or h-rays, has high solubility in solvents and cationically polymerizable compounds such as epoxy compounds, and has an excellent storage stability in compositions containing the cationically polymerizable compounds; and the like. The present invention relates to a sulfonium salt represented by the formula (1), a photoacid generator containing the sulfonium salt, and the like.

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Provided are a method for producing a peptide compound including a step of using a compound represented by Formula (1); a protective group-forming reagent including the compound; and the compound. At least one of R.sup.1 to R.sup.8 or Y.sup.2 has R.sup.A, R.sup.A represents an aliphatic hydrocarbon group or an organic group having an aliphatic hydrocarbon group, and the number of carbon atoms in at least one aliphatic hydrocarbon group is 12 or more. However, R.sup.A does not have a silyl group and a hydrocarbon group having a silyloxy structure.

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