Coating method using actinic radiation-curable formulation
AssigneeDymax Corporation
InventorsAndrew G. Bachmann, Stephen E. Cantor
Life of this patent
Estimating the term…
Abstract
An acrylate encapsulation formulation reacts at a high rate of speed, when exposed to radiation inclusive of wave-lengths in the ultraviolet and the visible range, to initially produce a relatively thick skin and to ultimately cure to a relatively low-stress deposit having good physical definition and surface properties. The method entails exposure of the formulation, on an object, to radiation for initialing photopolymerization and thermal polymerization, and the apparatus includes closely juxtaposed actinic radiation and thermal energy sources.
Claims32
A method for coating an object, comprising:
- providing an actinic radiation-curable formulation, comprising:
- a polymerizable liquid acrylate composition that contains an opacifying agent to render it substantially opaque to a band of radiation lying at least partially within the ultraviolet range and at least partially within the visible range, said composition transmitting less than 30 percent of radiation in said band incident thereupon;
- a catalyst system including a photoinitiator component and a thermal initiator component, each of said catalyst components being responsive for initiating polymerization of said acrylate composition, said photoinitiator component being responsive to radiation throughout said band and being selected from the group consisting of phosphine oxide compounds, perfluorinated diphenyl titanocene compounds, and mixtures thereof, and said thermal initiator component being responsive to temperatures below about 120.degree. C.;
- providing an object for coating;
- applying said formulation to said object to produce a coating thereon;
- and
- exposing said formulation to radiation throughout said wavelength band, in a first irradiation stage, to initiate photopolymerization, said first irradiation stage being continued for a period sufficient to produce substantial polymerization.
A method for coating an object, comprising:
- providing a formulation comprising a polymerizable liquid acrylate composition that contains a black opacifying agent and is substantially opaque to a band of radiation lying at least partially within the ultraviolet range and at least partially within the visible range, and a catalyst system including a photoinitiator component and a thermal initiator component, each of said catalyst components being responsive for initiating polymerization of said acrylate composition, said photoinitiator component being responsive to radiation throughout said band, and said thermal initiator component being responsive to temperatures below about 120.degree. C.;
- providing an object for coating;
- applying said formulation to said object to produce a coating thereon;
- and
- exposing said formulation to radiation throughout said wavelength band, in a first irradiation stage, to initiate photopolymerization, said first irradiation stage being continued for a period sufficient to produce substantial polymerization.
Dependencies are inferred from the claim text.