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Antimony-free photocurable resin composition and three dimensional article

A technology for products and compositions, applied in the field of low-viscosity photocurable compositions, capable of solving problems such as instability of antimony hexafluoride salt, increased resin viscosity, unusable antimony resin, etc.

Active Publication Date: 2008-11-05
HUNTSMAN ADVANCED MATERIALS (SWITZERLAND) GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Antimony is a toxic heavy metal and its presence in light-hardened parts makes antimony-containing resins unusable in many applications
Additionally, due to their high reactivity, antimony hexafluoride salts tend to be unstable and cause resin viscosity to increase over time

Method used

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  • Antimony-free photocurable resin composition and three dimensional article
  • Antimony-free photocurable resin composition and three dimensional article
  • Antimony-free photocurable resin composition and three dimensional article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0148]A general procedure for preparing three-dimensional articles using a stereolithographic apparatus is as follows. The photocurable composition was placed at about 30°C in a barrel designed for stereolithography equipment. The surface of the composition is irradiated with a UV / VIS light source, either all of it or according to a predetermined pattern, so that a layer of desired thickness is cured and set in the irradiated areas. New layers are irradiated either over the entire surface or in a predetermined pattern. The freshly cured layer adheres to the underlying cured layer. The layer forming step and the irradiation step are repeated until a green mold of multiple cured layers is made.

[0149] A "green mold" is a three-dimensional article initially formed by a stereolithographic process of layering and photocuring, where typically the layers are not fully cured. This allows the connected layers to be better connected by bonding together upon further curing. "Wet st...

Embodiment B

[0195] Tables BII-BV list the components of each of the photocurable compositions labeled Examples B2, B3, B5-B26 and Comparative Examples B1 and B4. The numbers in Tables B II to B V represent the weight percent of each component, based on the total weight of the photocurable composition. Table BVI provides identifying information for the trade names of the components of Tables BII-BV.

[0196] Form B II

[0197] components

[0198] Form B III

[0199] components

[0200] Form B IV

[0201] components

[0202] Form B V

[0203] components

[0204] Table BVI

[0205] components

[0206] The viscosity of several photocurable compositions was measured at 25°C or 30°C using a Brookfield viscometer, and the results are shown in Table B VII.

[0207] Form B VII

[0208] photocurable composition

[0209] Test models were then made from the photocurable composition on a 3D Systems SLA 350 or 7000 stereolithography mach...

Embodiment C

[0233] Table C II lists the components of a photocurable composition according to the invention and labeled Example C1. The numbers in Table CII represent the weight percent of each component, based on the total weight of the photocurable composition. Table CIII provides identifying information for the trade names of the components of Table CII.

[0234] Table C II

[0235] components

[0236] Form C III

[0237] components

[0238] The viscosity of this photocurable composition and a commercially available acrylate-containing photocurable composition (hereinafter referred to as "Comparative Example C") was measured at 30° C. using a Brookfield viscometer. Test models of the photocurable compositions of Example C1 and Comparative Example C were subsequently made on a SLA 7000 stereolithography machine. Before the mechanical test, the test model was conditioned at 23°C and 50% RH for 3-5 days.

[0239] The photosensitivity of the photocurable composition...

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Abstract

The present invention provides a low viscosity photocurable composition including (i) a cationically curable component (ii) a free radically active component (iii) an antimony- free cat ionic photoinitiator and (v) a free radical photoinitiator. The photocurable composition can be cured using rapid prototyping techniques to form three-dimensional articles which can be used in various aerospace and investment casting applications.

Description

field of invention [0001] The present invention relates to a low viscosity photocurable composition comprising (i) a cationically curable component, (ii) a free radical active component, (iii) an antimony-free cationic photoinitiator and optionally (iv ) free radical photoinitiators and optionally (v) tougheners, and their use in the production of three-dimensional articles by rapid prototyping techniques. Background of the invention [0002] Liquid-based solid imaging, eg, stereolithography, is a method whereby a photoformable liquid is applied in a thin layer to a surface and exposed to actinic radiation so that the liquid solidifies. Subsequently, a new thin layer of photoformable liquid is applied onto the previous liquid layer or pre-cured part. The new layer is then image-wise exposed, whereby the parts are image-wise cured and thus adhere between the partially new hardened area and the partially pre-hardened area. Each image-wise exposure has the property of having ...

Claims

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Application Information

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IPC IPC(8): G03F7/00G03F7/038B29C67/00B22C7/02A61L27/14G09B23/28A61L29/04C09D11/10
CPCG03F7/027G03F7/038G03F7/0037G03F7/0046B33Y70/00B33Y70/10
Inventor J·W·方R·莱登L·梅斯R·C·帕特尔C·查佩拉特
Owner HUNTSMAN ADVANCED MATERIALS (SWITZERLAND) GMBH
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