Patent ID: 6685869
Filing Date: 2004-02-03
Classification: B33Y,G03F

Abstract:
A process for making three dimensional objects from successive layers of a photocurable composition comprising the steps of (a) forming a layer of photocurable resin composition; (b) curing at least a portion of the layer by exposure to radiation; (c) introducing a new layer of resin composition onto the layer previously exposed to the radiation; (d) repeating steps (b) and (c) until a three dimensional object is formed and (e) washing the object with a washing agent, whereby the washing agent satisfies two conditions;(I) the washing agent causes a test specimen, obtained by photocuring a liquid resin comprising 50 parts by weight of polypropylene glycol diacrylate shown by the following formula (A), wherein m+n is 7, 47 parts by weight of methoxytripropylene glycol acrylate shown by the following formula (B), and 3 parts by weight of 1-hydroxycyclohexyl phenyl ketone as a photoinitiator, to swell at a swelling rate of 10 wt % or less when immersed therein at 23Â° C. for 12 hours, and(II) the washing agent causes the liquid resin to be dissolved or dispersed therein when 5 ml of the liquid resin is added to 30 ml of the washing agent and shaken for one minute at ambient temperature.