Method for curing photo-curable composition
AssigneesJapan Storage Battery Co., Ltd., Nippon Paint Co., Ltd.
InventorsHiroaki Mibu, Tadashi Ishihara, Chiaki Tanaka, Shingo Esaki
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Abstract
A photo-curable composition with high covering power provides the coating film with a glossy smooth surface when such composition is exposed firstly to light radiation having wavelengths of from about 350 nm to about 460 nm, and then to light radiation having wavelengths of from about 230 nm to about 400 nm with a specific ratio of the intensity of the former light radiation to the intensity of the latter light radiation.
Claims20
A method for curing a photo-curable composition consisting essentially of a resin having a .alpha.,.beta.-ethylenically unsaturated bond, a polymerizable monomer and a photosensitizer, said method comprising the sequential steps of:
- 1. irradiating said photo-curable composition with a light source A emitting radiation predominantly across the range of from about 350 to about 460 nm and substantially no wavelength shorter than 300 nm, for a period of time sufficient to cure the interior portion of said photo-curable composition and then in a second step,
- 2. irradiating said photo-curable composition with a light source B emitting radiation predominantly across the range of from about 230 to about 400 nm, for a period of time sufficient to cure the surface portion of said photo-curable composition,
- with the irradiation intensity ratio E.sub.A /E.sub.B being in the range of from 0.01 to 20 where E.sub.A is the irradiation intensity of light source A for wavelengths in the range of from about 350 to about 460 nm and E.sub.B is the irradiation intensity of light source B for wavelengths in the range of about 230 to about 400 nm on the surface of said photocurable composition.
A method for curing a photo-curable composition consisting essentially of a resin having an .alpha.,.beta.-ethylenically unsaturated bond, a polymerizable monomer, a photosensitizer and a pigment, said method comprising the sequential steps of:
- 1. irradiating said photo-curable composition with a light source A emitting radiation predominantly across the range of from about 350 to about 460 nm and substantially no wavelength shorter than 300 nm, for a period of time sufficient to cure the interior of said photo-curable composition, and then,
- 2. irradiating said photo-curable composition with a light source B emitting radiation predominantly across the range of from about 230 to about 400 nm, for a period of time sufficient to cure the surface of said photo-curable composition,
- with the irradiation intensity ratio E.sub.A /E.sub.B being in the range of from 0.01 to 20 where E.sub.A is the irradiation intensity of light source A for wavelengths in the range of from about 350 to about 460 nm and E.sub.B is the irradiation intensity of light source B for wavelengths in the range of about 230 to about 460 nm on the surface of said photocurable composition.
A method of curing a photo-curable composition consisting essentially of a resin having an .alpha.,.beta.-ethylenically unsaturated bond, a polymerizable monomer, a pigment and at least one of a filler, an additive and a photo-inactive diluent said method comprising the sequential steps of:
- 1. irradiating said photo-curable composition with a light source A emitting radiation predominately across the range of from about 350 to about 460 nm and substantially no wavelength shorter than 300 nm for a period of time sufficient to cure the interior of the said photo-curable composition, and then,
- 2. irradiating said photo-curable composition with a light source B emitting radiation predominantly across the range of from about 230 to about 400 nm for a period of time sufficient to cure the surface of said photo-curable composition,
- with the irradiation intensity ratio E.sub.A /E.sub.B being in the range of from 0.01 to 20 where E.sub.A is the irradiation intensity of light source A for wavelengths in the range of from about 350 to about 460 nm and E.sub.B is the irradiation intensity of light source B for wavelengths in the range of about 230 to about 460 nm on the surface of said photo-curable composition.
Dependencies are inferred from the claim text.