Provided are a photocurable resin composition that can be suitably used for an optical three-dimensional shaping method, and a cured product obtained by photocuring the composition and a three-dimensional shaped object including the cured product. The photocurable resin composition contains a compound represented by the formula (1) and a compound containing two or more epoxy groups. ##STR00001##

The invention relates to a method for producing a polyoxymethylene polyoxyalkylene block copolymer, said method including the process of reacting a polymer formaldehyde compound with alkylene oxide in the presence of a double metal cyanide (DMC) catalyst and an H-functional starter substance, wherein the theoretical molar mass of the polymer formaldehyde compound is lower than the theoretical molar mass of the H-functional starter substance, and the polymer formaldehyde compound has at least one terminal hydroxyl group, the theoretical molar mass of the H-functional starter substance being at least 500 g/mol. In the method according to the invention, a mixture i) is provided comprising the DMC catalyst and the H-functional starter substance in step (i); the polymer formaldehyde compound is then added to the mixture (i) in step (ii), thereby forming a mixture (ii); and the alkylene oxide is added in step (iii), step (ii) being carried out at the same time as or prior to step (iii).

A method for manufacturing 1,4-bis(4-phenoxybenzoyl)benzene, including: reacting terephthaloyl chloride with diphenyl ether in a reaction solvent and in the presence of a Lewis acid, so as to obtain a product mixture including a 1,4-bis(4-phenoxybenzoyl)benzene-Lewis acid complex; contacting the product mixture with an aqueous solution, so as to obtain an aqueous phase containing the Lewis acid and an organic phase containing 1,4-bis(4-phenoxybenzoyl)benzene; heating at least the second phase up to a maximum temperature, followed by cooling the second phase down to a separation temperature; subjecting at least the second phase to a solid/liquid separation step at the separation temperature, so as to recover solid 1,4-bis(4-phenoxybenzoyl)benzene.

The invention generally relates to novel poly-substituted cis stilbenes, their synthesis, their purification, and their use in thermoset resins. These novel cis stilbenes give rise to thermoset resins with greatly improved processing characteristics such as lower melting temperature and lower viscosity; resulting in polymers and composites having greatly improved thermal stability.

A method for manufacturing 1,4-bis(4-phenoxybenzoyl)benzene, including: reacting terephthaloyl chloride with diphenyl ether in a reaction solvent and in the presence of a Lewis acid, so as to obtain a product mixture comprising a 1,4-bis(4-phenoxybenzoyl)benzene-Lewis acid complex; putting the product mixture in contact with a protic solvent, so as to obtain a first phase containing the Lewis acid and a second phase containing 1,4-bis(4-phenoxybenzoyl)benzene; subjecting at least the second phase to a solid/liquid separation step by centrifugal filtration, so as to recover solid 1,4-bis(4-phenoxybenzoyl)benzene.

A method for manufacturing 1,4-bis(4-phenoxybenzoyl)benzene, including: providing terephthaloyl chloride, diphenyl ether, a solvent and a Lewis acid, wherein the terephthaloyl chloride is of a purity grade such that, 10 minutes after introducing it at a reference concentration of 6.5 wt. % into said solvent, at a temperature of 20 C., a solution is obtained having a turbidity of less than 500 NTU; mixing the terephthaloyl chloride, the diphenyl ether and the solvent so as to make a reactant mixture; adding the Lewis acid to the reactant mixture so as to effect the reaction of the terephthaloyl chloride with the diphenyl ether; recovering a product mixture comprising a 1,4-bis(4-phenoxybenzoyl)benzene-Lewis acid complex.

Provided are a photocurable resin composition that can be suitably used for an optical three-dimensional shaping method, and a cured product obtained by photocuring the composition and a three-dimensional shaped object including the cured product. The photocurable resin composition contains a compound represented by the formula (1) and a compound containing two or more epoxy groups.

##STR00001##

A method for manufacturing 1,4-bis(4-phenoxybenzoyl)benzene, including: reacting terephthaloyl chloride with diphenyl ether in the presence of a Lewis acid, so as to obtain a product mixture including 1,4-bis(4-phenoxybenzoyl)benzene-Lewis acid complex, wherein the 1,4-bis(4-phenoxybenzoyl)benzene-Lewis acid complex is, at least partly, in the form of a precipitate; carrying out a solid/liquid separation of the product mixture to obtain a cake comprising the 1,4-bis(4-phenoxybenzoyl)benzene-Lewis acid complex precipitate; putting the cake in contact with a decomplexing solvent, wherein the decomplexing solvent is a protic solvent, so as to dissociate the 1,4-bis(4-phenoxybenzoyl)benzene-Lewis acid complex into 1,4-bis(4-phenoxybenzoyl)benzene; and, recovering the 1,4-bis(4-phenoxybenzoyl)benzene. Also, a method for manufacturing a polyaryletherketone polymer starting from 1,4-bis(4-phenoxybenzoyl)benzene manufactured by the above method.

The invention generally relates to novel poly-substituted cis stilbenes, their synthesis, their purification, and their use in thermoset resins. These novel cis stilbenes give rise to thermoset resins with greatly improved processing characteristics such as lower melting temperature and lower viscosity; resulting in polymers and composites having greatly improved thermal stability.

A method for manufacturing 1,4-bis 4-phenoxybenzoyl) benzene, including: providing a reactant mixture including terephthaloyl chloride and diphenyl ether in a solvent; adding a Lewis acid to the reactant mixture, so as to obtain a product mixture; wherein the temperature of the reactant mixture is greater than 5 C. during at least part of the step of adding the Lewis acid to the reactant mixture.