Process for forming a colored three-dimensional article
First Claim
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1. A process for forming a three-dimensional article having selectively coloured regions from a photocurable, photocolourable composition comprising the steps:
- a) curing a layer of the composition using light thereby forming a polymeric layer;
b) irradiating selected areas of the polymeric layer resulting from step a) or of a layer of the composition with a higher dose of light than used in step a) thereby forming selectively coloured areas;
c) repeating steps a) and b) on a previously formed polymeric layer until the desired three-dimensional article having selectively coloured regions is formed;
wherein the wavelength(s) of light used in each of steps a) and b) is or are the same.
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Abstract
Process for forming a selectively colored polymeric layer, or a three-dimensional article made of polymeric layers, wherein a photocurable, photocolorable composition is irradiated with a low dose of light to cure and a different, preferably higher, dose of light to color. The process is particularly useful for preparing selectively colored ornamental and industrial articles and models of plant and animal parts, especially medical models.
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Citations
24 Claims
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1. A process for forming a three-dimensional article having selectively coloured regions from a photocurable, photocolourable composition comprising the steps:
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a) curing a layer of the composition using light thereby forming a polymeric layer; b) irradiating selected areas of the polymeric layer resulting from step a) or of a layer of the composition with a higher dose of light than used in step a) thereby forming selectively coloured areas; c) repeating steps a) and b) on a previously formed polymeric layer until the desired three-dimensional article having selectively coloured regions is formed;
wherein the wavelength(s) of light used in each of steps a) and b) is or are the same. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A photocurable, photocolourable composition comprising:
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(a) 100 parts of (meth)acrylate monomers and/or oligomers; (b) 0.01 to 10 parts of a photoinitiator; (c) 0.01 to 4 parts in total of a compound which is convertible by a photochemical reaction into a developer; (d) 0.01 to 4 parts in total of a compound which forms colour or changes colour on contact with said developer; and (e) 0 to 2 parts of a peroxide; wherein all parts are by weight and the compound which is convertible by a photochemical reaction into a developer comprises an acylphosphine oxide, acylphosphine sulphide, onium salt, latent sulphonic acid or metallocene. - View Dependent Claims (17, 18, 19)
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20. A process for forming a three-dimensional article having selectively coloured regions from a photocurable, photocolourable composition comprising the steps:
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a) curing a layer of the composition using light thereby forming a polymeric layer; b) irradiating selected areas of the polymeric layer resulting from step a) or of a layer of the composition with a higher dose of light than used in step a) thereby forming selectively coloured areas; c) repeating steps a) and b) on a previously formed polymeric layer until the desired three-dimensional article having selectively coloured regions is formed;
wherein said three-dimensional article is a model of a plant or animal part or a model of an automobile mechanical part. - View Dependent Claims (21, 22)
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23. A process for forming a three-dimensional article having selectively coloured regions from a photocurable, photocolourable composition comprising the steps:
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a) curing a layer of the composition using light thereby forming a polymeric layer; b) irradiating selected areas of the polymeric layer resulting from step a) or of a layer of the composition with a higher dose of light than used in step a) thereby forming selectively coloured areas; and c) repeating steps a) and b) on a previously formed polymeric layer until the desired three-dimensional article having selectively coloured regions is formed;
wherein the light used in each of step a) and b) is from a single source.
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24. A process for forming a three-dimensional article having coloured regions from a photocurable, photocolourable composition comprising the steps:
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a) curing a layer of the composition using light thereby forming a polymeric layer; b) irradiating selected areas of the polymeric layer resulting from step a) or of a layer of the composition with a different dose of light than used in step a) thereby forming selectively coloured areas; and c) repeating steps a) and b) on a previously formed polymeric layer until the desired three-dimensional article having selectively coloured regions is formed; and d) coating the three-dimensional article with a visually transparent layer which absorbs the wavelength of light used in step b).
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Specification