摘要:
Disclosed are cationic photocurable compositions with improved shelf life stability. The thermally stable compositions comprise at least one cationically polymerizable compound, for example an epoxy compound, at least one onium salt photoinitiator and at least one compound selected from the group consisting of the organic phosphorus stabilizers and the hindered nitroxyl stabilizers. Also disclosed is a cationic photoinitiator composition comprising at least one onium salt photoinitiator and at least one compound selected from the group consisting of the organic phosphorus stabilizers and the hindered nitroxyl stabilizers.
摘要:
Liquid thermosetting ink for ink-jet applications includes at least a resin, at least one solid latent curing agent having a maximal particle size of less than 2 microns and an inert filler having fine particles. The single-pack or two-pack ink has a viscosity lower than 50 Cp at the application temperature, a surface tension lower than 80 dyn/cm at the application temperature, and a glass transition temperature of cured ink of greater than 120° C.
摘要:
A method for curing a formulation comprising a curable composition by treating the formulation with radiation having a wavelength between about 220 nm and about 600 nm and heating the formulation to generate either acid or base curing agents is provided. A formulation comprising the curable composition, a thermal initiator, and a photoinitiator to generate the acid or base curing agents is also provided. The curable composition may be an epoxy-based composition.
摘要:
A method of constructing a microelectronic assembly as provided. A mold piece is locating over a microelectronic die carrying an integrated circuit. An encapsulant is injected into a space defined between surfaces of the mold piece and the microelectronic die. The encapsulant includes a liquid phase epoxy and a solid phase catalyst compound when injected. The encapsulant mixture is heated in the space to a temperature where the catalyst compound becomes a liquid and cures the epoxy. The catalyst compound may, for example, be polystyrene and the catalyst may be diphenyl phosphine. The catalyst compound is then heated to above its glass transition temperature so that the diphenyl phosphine is released from the polystyrene. The diphenyl phosphine then cures the epoxy. The epoxy is preferably a liquid at room temperature.
摘要:
Hardeners for water-based epoxy resin systems, the hardeners being obtainable by reacting a mixture of: (A) at least one epoxidized polyalkylene oxide selected from the group of epoxidized polyethylene oxides, epoxidized polypropylene oxides and polyethylene propylene oxides, (B) at least one epoxidized aromatic hydroxy compound selected from the group of bisphenol A epoxides and bisphenol F epoxides and (C) at least one aromatic hydroxy compound selected from the group of bisphenol A and bisphenol F, to form an intermediate product and subsequently reacting this intermediate product with a polyamine (E), are disclosed.
摘要:
Epoxy polymer precursors and epoxy polymers resulting therefrom are tolerant to bombardment by high-energy radiation. The epoxy polymer precursors comprise at least an epoxy resin free of aromatic units and at least a curing agent selected from the group consisting of aliphatic polyamines, cycloaliphatic polyamines, polyamides, aliphatic anhydrides, cycloaliphatic anhydrides, and mixtures thereof. In one embodiment of the invention the epoxy resin comprises at least a cycloparaffinic group, and the curing agent comprises a polyamine derived from cyclohexane. Such epoxy polymer compositions are used to form reflectors elements between adjacent scintillator elements in high-energy radiation detector array.
摘要:
A tile grout composition and method of using the tile grout composition to grout set tiles are provided. The tile grout composition is a water-based epoxy grout composition which has excellent stain and chemical resistant properties and is workable and easy to clean up after grouting the tiles. The grout composition employs a water dispersible epoxy polymer and a water compatible polyamine epoxy resin adduct as the curing agent in combination with a water repellent component. For colored grouts, a color coated filler such as sand is employed to obtain the enhanced tile grout properties. Luminescent and fluorescent additives and sparkle additives may be used in the grout to provide special visual effects in the light or dark.
摘要:
The thermosetting resin composition which is valuable for an undercoat of a printed wiring board, and does not leave an air bubble in a cured film, and makes the surface polishing easy and can form a smooth printed wiring board comprises (I) an adduct of epoxy resin with unsaturated aliphatic acid, (II) a (meth) acrylate, (III) a radical polymerization initiator, (IV) a crystallizable epoxy resin, and (V) a latent curing agent.
摘要:
The present invention is generally directed to a process for producing lactide-based polymers and the polymers produced by this process. The polymers of the present invention are terpolymers formed by the copolymerization of a lactide monomer, a linking monomer and an epoxy-terminated monomer. In one embodiment of the invention, the polymers may be formed from fluorine-containing monomers or aromatic ring-containing monomers. The disclosed materials may display improved hydrolytic and thermal characteristics as compared to previously known lactide-based materials. For example, the lactide based terpolymers may have a glass transition temperature over 60° C. For instance, lactide-based thermoplastic terpolymers of the present invention can have a glass transition temperatures of about 80° C. or higher. Lactide-based thermoset networks of the invention can have glass transition temperatures of up to about 200° C.
摘要:
A moulding powder which is curable with the application of heat and pressure, comprising a mechanical mixture consisting of: a) a powdered epoxy compound containing on average more than one epoxy group in the molecule and having a softening point of above 60.degree. C., b) a powdered aliphatic or N-heterocyclic amine or a powdered amino group-containing adduct based on an aliphatic, cycloaliphatic, araliphatic or N-heterocyclic amine containing on average more than one amino group in the molecule and having a melting point or softening point of above 60.degree. C. and, optionally, c) customary additives for moulding powders, the particles of a) and b) being smaller than 200 .mu.m, is excellently suited for the preparation of coatings on heat-sensitive substrates and is used in particular in powder coating.