The present invention relates to a composition comprising a) at least one epoxy resin, b) at least one amine having at least two secondary amino groups which are both part of an organic ring system, and c) at least one salt of a very strong Brønsted acid with a counterion selected from metal ions, metal-containing ions, phosphonium ions and ammonium ions, and to processes for production thereof and use thereof.

A curable liquid composition containing a particulate filler and an epoxy compound having a non-aromatic cyclic group having 5 or more annular atoms, having a favorable dispersion stability of particulate filler and providing a cured material having high hardness, a filler that is suitably incorporated in the curable liquid composition, and a compound that can be suitably used as a ligand bonded to the filler. In a curable liquid composition comprising an epoxy compound having a non-aromatic cyclic group having 5 or more annular atoms as a curable component, a filler on a surface of which a ligand having an alicyclic epoxy group that may be condensed with an aromatic ring and a thiol group, is bonded, is used.

Radiation curable compositions for additive fabrication are described and claimed. Such compositions are particularly suited for investment casting applications, and include a cationically polymerizable component, a radically polymerizable component, a certain type of prescribed antimony-free, sulfonium salt-based cationic photoinitiator, and a free-radical photoinitiator. In other embodiments, the composition may also include a photosensitizer and/or a UV/absorber. Also described and claimed is a method for using a liquid radiation curable resin for additive fabrication with a certain type of prescribed antimony-free, sulfonium salt-based cationic photoinitiator and a certain type of prescribed photosensitizer in an investment casting process.

A compound of formula (I): MX.sub.y, alone or in combination with a compound of formula (II): MX.sub.zL, useful as a catalyst for accelerating the crosslinking of a reactive epoxy monomer, oligomer or polymer to form an epoxy thermoset resin, is provided. In formulas (I) and (II), M represents a rare earth metal cation, X represents an anion of formula R—Z—O″, wherein R represents a hydrocarbon radical optionally substituted with one or more halogen atom and —Z— represents —S(═O).sub.2— or —O—S(═O).sub.2—, z=y+1, and L represents Na.sup.+, H.sup.+, or a combination thereof.

An epoxy resin component(s) for a recyclable epoxy resin system is disclosed. The recyclable epoxy resin system comprises an epoxy resin component having a structural Formula I or an epoxy resin component having a structural Formula II and a curing agent. A process(es) for preparing the epoxy resin component having the structural Formula I and the epoxy resin system having the structural Formula II is also disclosed.

Provided is a stereolithographic resin composition that suppresses sedimentation of the filler during shaping, has good handleability, and has high thermal conductance of the cured product. A stereolithographic resin composition containing a photocurable resin and a filler, wherein the filler is a metal-coated particle having a base particle including a polymer material and having a metal layer coating the surface of the base particle, and a density of the metal-coated particle is 1.5 g/cm.sup.3 to 4.0 g/cm.sup.3.

An epoxy resin component(s) for a recyclable epoxy resin system is disclosed. The recyclable epoxy resin system comprises an epoxy resin component having a structural Formula I or an epoxy resin component having a structural Formula II and a curing agent. A process(es) for preparing the epoxy resin component having the structural Formula I and the epoxy resin system having the structural Formula II is also disclosed.

The present invention is directed to a photo-curable composition for use in additive manufacturing, said composition comprising, based on the total weight of the composition: from 10 to 80 wt. % of a) a dispersion of nanosilica particles in epoxy resin, said nanosilica particles having an average particle size (d50) of less than 50 nm, as measured by dynamic light scattering; from 10 to 80 wt. % of b) a toughened epoxy resin comprising i) core shell rubber particles; and, ii) at least one cycloaliphatic epoxy resin; and, from 0.1 to 10 wt. % of c) a photoinitatior, said photoinitator comprising an ionic photoacid generator.

To prevent gelling even during storage for a long time period under high temperature or room temperature, and to achieve rapid curing under a room-temperature condition at the time of photoirradiation, provided are a photocationically curable composition containing a cationically polymerizable monomer and photoacid generators, and being substantially free of a hydrogen ion scavenger, wherein the photoacid generators include: at least one kind of photoacid generator selected from a photoacid generator formed of an ion pair whose anion is a noncoordinating anion, and a photoacid generator formed of a zwitterionic compound whose anionic moiety is a noncoordinating anionic moiety; and at least one kind of photoacid generator selected from a photoacid generator formed of an ion pair whose anion is not a noncoordinating anion and a photoacid generator formed of a zwitterionic compound whose anionic moiety is not a noncoordinating anionic moiety, and a dental curable composition using the same.

Radiation curable compositions for additive fabrication are described and claimed. Such compositions are particularly suited for investment casting applications, and include a cationically polymerizable component, a radically polymerizable component, a certain type of prescribed antimony-free, sulfonium salt-based cationic photoinitiator, and a free-radical photoinitiator. In other embodiments, the composition may also include a photosensitizer and/or a UV/absorber. Also described and claimed is a method for using a liquid radiation curable resin for additive fabrication with a certain type of prescribed antimony-free, sulfonium salt-based cationic photoinitiator and a certain type of prescribed photosensitizer in an investment casting process.