Process for transfer coating with radiation-curable compositions
AssigneeMobil Oil Corporation
InventorsWilliam H. McCarty, John P. Guarino, Frank A. Nagy
Life of this patent
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Abstract
Radiation curable coating vehicles, suitable for transfer coating application and strippable from a variety of carrying webs, can be produced by proper selection of coating ingredients and cured either by actinic radiation or electron beams. Potential crosslink density (as herein defined), glass transition temperature and the relative presence or absence of specific adhesion-promoting functional groups are controlled to arrive at a coating composition having the desired degree of adhesion to the substrate to be coated and the carrying web which is to transfer the coating composition to that substrate.
Claims14
A process for applying a coating to a thin porous substrate and reducing absorption of said coating into said substrate, said process comprising:
- (a) applying a radiation-curable composition to a carrying web;
- said radiation-curable coating composition having a crosslink density of 0.11 to about 1.0 determined by calculation of the gram moles of branch points per 100 grams of uncured coating;
- a glass transition temperature of the radiation cured coating within the approximate range of -20.degree. C. to 50.degree. C.;
- and containing internal lubricant incorporated therein in an amount sufficient to facilitate removal of the cured coating from a carrying web substrate without adversely affecting adhesion of the cured coating to said solid substrate;
- said carrying web being of a nature such that said coating composition, when cured, will not adhere to its surface;
- (b) bringing a thin porous substrate to which said coating composition will adhere into contact with said coating composition on said carrying web to form a sandwich;
- (c) subjecting said sandwich to a radiation curing process wherein said coating composition is polymerized and set on the surface on said porous substrate;
- and
- (d) stripping said carrying web away from the layer comprising said cured coating composition.
Dependencies are inferred from the claim text.