Method of making heat curable adhesive coated insulation for transformers
First Claim
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1. A method of making a flexible, resin adhesive coated substrate comprising the steps of:
- (A) applying a surface coating, on at least one side of a porous, flexible sheet material containing at least 4 wt.% moisture without appreciably impregnating the sheet, said coating consisting of a wet, heat reactive adhesive resin, having added thereto from about 10 parts to about 80 parts per 100 parts heat reactive resin of a monomer selected from the group consisting of acrylic monomer, vinyl monomer and mixtures thereof, and an amount of an ultraviolet radiation sensitive photoinitiator effective to cause polymerization of monomer in response to ultraviolet radiation;
(B) applying ultraviolet radiation to the adhesive resin coating on the sheet material, in a manner and for a time effective to polymerize monomer without the application of heat so that the sheet material retains at least 3.5 wt.% moisture, to form a flexible substrate with a dry, uncured surface coating of adhesive bonded to the sheet material, said adhesive being curable by the application of heat.
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Abstract
A flexible resin adhesive coated substrate is made by: (A) coating a sheet material with a wet, heat reactive adhesive resin, containing a monomer and an amount of an ultraviolet radiation sensitive photoinitiator effective to cause polymerization of monomer in response to ultraviolet radiation, and (B) applying ultraviolet radiation to the adhesive resin coating on the sheet material to polymerize monomer without the application of heat, forming a dry, uncured coating of adhesive bonded to the sheet material.
49 Citations
8 Claims
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1. A method of making a flexible, resin adhesive coated substrate comprising the steps of:
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(A) applying a surface coating, on at least one side of a porous, flexible sheet material containing at least 4 wt.% moisture without appreciably impregnating the sheet, said coating consisting of a wet, heat reactive adhesive resin, having added thereto from about 10 parts to about 80 parts per 100 parts heat reactive resin of a monomer selected from the group consisting of acrylic monomer, vinyl monomer and mixtures thereof, and an amount of an ultraviolet radiation sensitive photoinitiator effective to cause polymerization of monomer in response to ultraviolet radiation; (B) applying ultraviolet radiation to the adhesive resin coating on the sheet material, in a manner and for a time effective to polymerize monomer without the application of heat so that the sheet material retains at least 3.5 wt.% moisture, to form a flexible substrate with a dry, uncured surface coating of adhesive bonded to the sheet material, said adhesive being curable by the application of heat. - View Dependent Claims (8)
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2. A method of making a flexible, patterned, porous, resin adhesive coated substrate comprising the steps of:
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(A) applying a surface coating, on at least one side of a moving, flexible, paper sheet material, containing at least 4 wt.% moisture, in a predetermined, discontinuous pattern, without appreciably impregnating the sheet, said coating consisting of a wet, heat reactive adhesive resin, having added thereto from about 10 parts to about 80 parts per 100 parts heat reactive resin of a monomer selected from the group consisting of acrylic monomer, vinyl monomer and mixtures thereof, and an amount of an ultraviolet radiation sensitive photoinitiator effective to cause polymerization of monomer in response to ultraviolet radiation, said adhesive resin pattern coating covering from about 10 percent to 90 percent of the sheet material area; (B) applying ultraviolet radiation to the adhesive resin coating on the sheet material, in a manner and for a time effective to polymerize monomer without the application of heat so that the sheet material retains at least 3.5 wt.% moisture to form a flexible substrate with a discontinuous, patterned, dry, uncured surface coating of adhesive bonded to the sheet material, where the sheet is moved by the ultraviolet radiation source at a rate of speed of between about 5 ft./min. to about 120 ft./min.;
said adhesive being curable by the application of heat and said adhesive pattern coating covering from about 10 percent to 90 percent of the sheet material area. - View Dependent Claims (3, 4, 5, 6, 7)
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Specification