Method of providing leveling property to photocurable resin composition layers in production process of three-dimensional objects by photohardening

Claim 1

In a process for producing a three-dimensional photohardened object by forming a layer of photocurable resin composition containing a photocurable liquid, a filler and a photoinitiator, photohardening at least a portion of said layer by applying actinic radiation thereto, and thereafter repeating the process of forming thereabove a new layer of photocurable resin composition and photohardening at least a portion of said new layer by application of said actinic radiation to thereby produce a three-dimensional photohardened object, the improvement wherein said process includes the step of improving leveling property of said layer of said photocurable resin composition by adding 0.1-5 weight parts of phosphoric acid ester shown by Formula 1 given below to said photocurable resin composition for 100 weight parts of said filler contained therein, said Formula 1 being given as follows: ##STR2## where R is alkyl group with 1-15 carbon atoms, A is a residual group obtained by removing hydroxyl groups from a diol selected from the diol group consisting of polyetherdiol, polyesterdiol and polyetheresterdiol, M is H or a monovalent base, and m and n are each 1 or 2 such that m+n=3.