Abstract: To provide a siloxane polymer containing a silsesquioxane unit and a chain siloxane unit in the main chain and having a reactive group. A siloxane polymer containing a repeating unit represented by Formula (1): R0's independently represent C6-20 aryl or C5-6 cycloalkyl; R1 independently represent a hydrogen atom, C6-20 aryl, C5-6 cycloalkyl, C7-40 arylalkyl, or C1-40 alkyl; R2, R4, and R6 independently represent C6-20 aryl, C5-6 cycloalkyl, C7-40 arylalkyl, or C1-40 alkyl; R3 represents a monovalent group having a reactive group; R5's independently represent C6-20 aryl, C5-6 cycloalkyl, C7-40 arylalkyl, C1-40 alkyl, or C1-20 alkoxy; y1, y2, and z are an integer of 0 to 30; g? is 0 or 1; and, in the case of y1=y2=z=0, at least one terminal is the group represented by Formula (2).

Abstract: A siloxane polymer contains a silsesquioxane unit and a linear siloxane unit in its main chain and has a cage-type silsesquioxane structure in its side chain. A highly transparent and flexible film having a small linear thermal expansion coefficient is produced by utilizing the cohesion force (physical crosslinking) of the cage-type silsesquioxane in the side chain. The siloxane polymer has repeating units respectively represented by formulae (1) and (4), and has terminal groups respectively represented by formulae (5L) and (5R) at its right and left terminals, wherein A represents a structure shown below.

Abstract: A condensation-curable resin composition which contains: (A) an organosilicon compound containing a structural unit (i) represented by the following formula (i) and a structural unit (ii) represented by the following formula (ii), having a SiOH group at both ends of the molecular chain, and having a weight average molecular weight of 10,000 or more and 10,000,000 or less; and (B) an organometallic compound having three or more condensation-reactive groups. In formula (i), each R1 is independently a hydrocarbon group having 1 to 8 carbon atoms. In formula (ii), each R2 is independently a hydrocarbon group having 1 to 8 carbon atoms.

Abstract: A cationically polymerizable composition that provides a cured product and having an excellent balance of adhesion to various substrates, particularly, a silver substrate, and excellent handling properties. A cationically polymerizable composition including a double-decker type silsesquioxane compound having at least one alicyclic epoxy group in one molecule (A), a cationically polymerizable compound (B), a compound having a vinyl group and a cationically polymerizable cyclic ether (C), and a chelate-modified epoxy compound (D).

Abstract: To provide a siloxane polymer containing a silsesquioxane unit and a chain siloxane unit in the main chain and having a reactive group. A siloxane polymer containing a repeating unit represented by Formula (1): R0's independently represent C6-20 aryl or C5-6 cycloalkyl; R1 independently represent a hydrogen atom, C6-20 aryl, C5-6 cycloalkyl, C7-40 arylalkyl, or C1-40 alkyl; R2, R4, and R6 independently represent C6-20 aryl, C5-6 cycloalkyl, C7-40 arylalkyl, or C1-40 alkyl; R3 represents a monovalent group having a reactive group; R5's independently represent C6-20 aryl, C5-6 cycloalkyl, C7-40 arylalkyl, C1-40 alkyl, or C1-20 alkoxy; y1, y2, and z are an integer of 0 to 30; g? is 0 or 1; and, in the case of y1=y2=z=0, at least one terminal is the group represented by Formula (2).

Abstract: Provided is a new compound which can provide a cured film obtained from a resin composition with low cure shrinkage while suppressing reduction of hardness (scratch resistance) thereof. A silsesquioxane derivative having a radically polymerizable functional group, which is represented by formula (1), (2) or (3). In the formulas (1) to (3), R1 is a group independently selected from alkyl having 1 to 45 carbons, cycloalkyl having 4 to 8 carbons, aryl having 6 to 14 carbons and arylalkyl having 7 to 24 carbons, R2 and R3 are a group independently selected from alkyl having 1 to 10 carbons, cyclopentyl, cyclohexyl and phenyl, and X is independently hydrogen or a monovalent organic group, in which at least one of X is a radically polymerizable functional group represented by formula (4).

Abstract: An epoxy resin composition which is suppressed in curing shrinkage upon being cured to obtain a cured film having low warpage and high adhesion. The epoxy resin composition contains epoxy resin (A), compound (B) represented by formula (1) and nanosilica filler (C). In formula (1), R1 and R2 are independently an alkyl group having 1 to 10 carbons or a phenyl group, and X is independently hydrogen or a monovalent organic group, and in one molecule of the compound, at least one of X includes an epoxy group.

Abstract: A silicon compound is described, being obtained by a hydrosilylation reaction of the following compound (a), compound (b) and compound (c). Compound (a) is a silsesquioxane derivative having two or more SiH in one molecule. Compound (b) is a compound having, in one molecule, epoxy and/or oxetanyl and an alkenyl having a carbon number of 2 to 18. Compound (c) is a compound having, in one molecule, an alkoxysilyl and an alkenyl having a carbon number of 2 to 18.

Abstract: A silicon compound is described, being obtained by a hydrosilylation reaction of the following compound (a), compound (b) and compound (c). Compound (a) is a silsesquioxane derivative having two or more SiH in one molecule. Compound (b) is a compound having, in one molecule, epoxy and/or oxetanyl and an alkenyl having a carbon number of 2 to 18. Compound (c) is a compound having, in one molecule, an alkoxysilyl and an alkenyl having a carbon number of 2 to 18.