Method of applying an organic coating onto an inorganic coated steel sheet for a magnetic laminate application

Claim 2

A CONTINUOUS, SUBSTANTIALLY POLLUTION-FREE METHOD FOR UNIFORMLY IMPROVING THE SURFACE RESISTTIVITY OF ORIENTED STEEL STRIP HAVING AN INORGANIC MATERIAL AS A SURFACE INSULATING COATING TO PRODUCE AN ORIENTED STEEL STRIP-INORGANIC COATING ORGANIC RESIN COMPOSITE CAPABLE OF PROVIDING AN AVERAGE FRANKLIN TEST READING OF FROM 0.1 TO 0 AMPERES AT A PRESSURE OF UP TO 300 PSI. WHICH COMPRISES,

Claim 3

TREATING THE ORIENTED STEEL STRIP WITH AN IRRADIATION CURABLE SOLVENTLESS ORGANIC RESIN TO A THICKNESS OF UP TO 0.2 MIL, AND

Claim 4

TREATING THE ORIENTED STEEL STRIP WITH AN IRRADIATION CURABLE SOLVENTLESS ORGANIC RESIN TO A THICKNESS OF UP TO 0.2 MIL, AND

Claim 5

PASSING THE TREATED ORIENTED STEEL STRIP THROUGH AN IRRADIATION CURING ZONE AT A RATE OF FROM 100 TO 600 FEET PER MINUTE, USING AN IRRADIATION FLUX SUFFICIENT TO EFFECT THE CURE OF THE SOLVENTNESS ORGANIC RESIN TO AN ORGANIC RESIN HARDNESS CAPABLE OF BEING TESTED BY THE ABOVE-DESCRIBED FRANKLIN TEST, WHRE SAID RESIN IS CHARACTERIZED BY HAVING A VISCOSITY OF UP TO 3,000 CENTIPOISES AT 25*C, AND IS A MIXTURE CONSISTING ESSENTIALLY OF BY WEIGHT FROM A. 20 TO 40% OF A VINYL AROMATIC MATERIAL SELECTED FROM STYRENE, VINYL TOLUENE, TERT-BUTYLSTYRENE AND MIXTURES THEREOF, B. 80 TO 60% OF AN UNSATURATED POLYSTER REACTION PRODUCT OF (I) A GLYCOL AND (II) AN ALIPHATICALY UNSATURATED ORGANIC DICARBOXYLIC ACID, WHERE I. IS A GLYCOL SELECTED FROM THE CLASS CONSISTING OF A MIXTURE OF 20-60 MOLE PERCENT OF NEOPENTYL GLYCOL AND 40-80 MOLE PERCENT OF A MEMBER SELECTED FROM PROPYLENE GLYCOL, ETHYLENE GLYCOL AND MIXTURES THEREOF, AND B. A MIXTURE OF (A) 1 TO 40% BY WEIGHT THEREOF OF TRIMETHYLOLPROPANE MONOALLY ETHER, AND II. IS AN ALIPHATICALLY UNSATURATED ORGANIC DICARBOXYLIC ACID CONSISTING ESSENTIALLY OF A MIXTURE OF 50 TO 65 MOLE PERCENT OF FUMARIC ACID AND 35 TO 50 MOLE PERCENT OF A MEMBER SELECTED FROM TETRAHYDROPHTHALIC ANHYDRIDE AND MIXENDOMETHYLENE TETRAHYDROPTHALIC ANHYDRIDE AND MIXTURES THEREOF WHERE THERE IS UTILIZED IN MAKING THE UNSATURATED POLYESTER REACTION PRODUCT OF (B), UP TO AT LEAST ABOUT 10 MOLE PERCENT EXCESS OF THE GLYCOL OF (I) OVER THE ALIPHATICALLY UNSATURATED ORGANIC DICARBOXYLIC ACID OF (II) C. 1% TO 5% BASED ON THE WEIGHT OF (A) AND (B) OF A UV SENSITIZER, AND D. 0.05% TO 1% BASED ON THE WEIGHT OF (A),(B) AND (C) OF PARAFFIN WAX.

Claim 6

PASSING THE TREATED ORIENTED STEEL STRIP THROUGH AN IRRADIATION CURING ZONE AT A RATE OF FROM 100 TO 600 FEET PER MINUTE, USING AN IRRADIATION FLUX SUFFICIENT TO EFFECT THE CURE OF THE SOLVENTNESS ORGANIC RESIN TO AN ORGANIC RESIN HARDNESS CAPABLE OF BEING TESTED BY THE ABOVE-DESCRIBED FRANKLIN TEST, WHRE SAID RESIN IS CHARACTERIZED BY HAVING A VISCOSITY OF UP TO 3,000 CENTIPOISES AT 25*C, AND IS A MIXTURE CONSISTING ESSENTIALLY OF BY WEIGHT FROM A. 20 TO 40% OF A VINYL AROMATIC MATERIAL SELECTED FROM STYRENE, VINYL TOLUENE, TERT-BUTYLSTYRENE AND MIXTURES THEREOF, B. 80 TO 60% OF AN UNSATURATED POLYSTER REACTION PRODUCT OF (I) A GLYCOL AND (II) AN ALIPHATICALY UNSATURATED ORGANIC DICARBOXYLIC ACID, WHERE I. IS A GLYCOL SELECTED FROM THE CLASS CONSISTING OF A MIXTURE OF 20-60 MOLE PERCENT OF NEOPENTYL GLYCOL AND 40-80 MOLE PERCENT OF A MEMBER SELECTED FROM PROPYLENE GLYCOL, ETHYLENE GLYCOL AND MIXTURES THEREOF, AND B. A MIXTURE OF (A) 1 TO 40% BY WEIGHT THEREOF OF TRIMETHYLOLPROPANE MONOALLY ETHER, AND II. IS AN ALIPHATICALLY UNSATURATED ORGANIC DICARBOXYLIC ACID CONSISTING ESSENTIALLY OF A MIXTURE OF 50 TO 65 MOLE PERCENT OF FUMARIC ACID AND 35 TO 50 MOLE PERCENT OF A MEMBER SELECTED FROM TETRAHYDROPHTHALIC ANHYDRIDE AND MIXENDOMETHYLENE TETRAHYDROPTHALIC ANHYDRIDE AND MIXTURES THEREOF WHERE THERE IS UTILIZED IN MAKING THE UNSATURATED POLYESTER REACTION PRODUCT OF (B), UP TO AT LEAST ABOUT 10 MOLE PERCENT EXCESS OF THE GLYCOL OF (I) OVER THE ALIPHATICALLY UNSATURATED ORGANIC DICARBOXYLIC ACID OF (II) C. 1% TO 5% BASED ON THE WEIGHT OF (A) AND (B) OF A UV SENSITIZER, AND D. 0.05% TO 1% BASED ON THE WEIGHT OF (A),(B) AND (C) OF PARAFFIN WAX.

Claim 7

A method in accordance with claim 1, where the inorganic coating on the oriented steel strip is a magnesium oxide or a magnesium silicate.

Claim 8

passing the treated oriented steel strip through an irradiation curing zone at a rate of from 100 to 600 feet per minute, using an irradiation flux sufficient to effect the cure of the solventless organic resin to an organic resin hardness capable of being tested by the above-described Franklin test, where said resin is characterized by having a viscosity of up to 3,000 centipoises at 25*C, and is a mixture consisting essentially of by weight from A. 20 to 40% of a vinyl aromatic material selected from styrene, vinyl toluene, tert-butylstyrene and mixtures thereof, B. 80 to 60% of an unsaturated polyester reaction product of (i) a glycol anD (ii) an aliphatically unsaturated organic dicarboxylic acid, where i. is a glycol selected from the class consisting of a. a mixture of 20-60 mole percent of neopentyl glycol and 40-80 mole percent of a member selected from propylene glycol, ethylene glycol and mixtures thereof, and b. a mixture of (a) 1 to 40% by weight thereof of trimethylolpropane monoallyl ether, and ii. is an aliphatically unsaturated organic dicarboxylic acid consisting essentially of a mixture of 50 to 65 mole percent of fumaric acid and 35 to 50 mole percent of a member selected from tetrahydrophthalic anhydride, endomethylene tetrahydrophthalic anhydride and mixtures thereof where there is utilized in making the unsaturated polyester reaction product of (B), up to at least about 10 mole percent excess of the glycol of (i) over the aliphatically unsaturated organic dicarboxylic acid of (ii) C. 1% to 5% based on the weight of (A) and (B) of a UV sensitizer, and D. 0.05% to 1% based on the weight of (A), (B) and (C) of paraffin wax.

Claim 9

passing the treated oriented steel strip through an irradiation curing zone at a rate of from 100 to 600 feet per minute, using an irradiation flux sufficient to effect the cure of the solventless organic resin to an organic resin hardness capable of being tested by the above-described Franklin test, where said resin is characterized by having a viscosity of up to 3,000 centipoises at 25*C, and is a mixture consisting essentially of by weight from A. 20 to 40% of a vinyl aromatic material selected from styrene, vinyl toluene, tert-butylstyrene and mixtures thereof, B. 80 to 60% of an unsaturated polyester reaction product of (i) a glycol anD (ii) an aliphatically unsaturated organic dicarboxylic acid, where i. is a glycol selected from the class consisting of a. a mixture of 20-60 mole percent of neopentyl glycol and 40-80 mole percent of a member selected from propylene glycol, ethylene glycol and mixtures thereof, and b. a mixture of (a) 1 to 40% by weight thereof of trimethylolpropane monoallyl ether, and ii. is an aliphatically unsaturated organic dicarboxylic acid consisting essentially of a mixture of 50 to 65 mole percent of fumaric acid and 35 to 50 mole percent of a member selected from tetrahydrophthalic anhydride, endomethylene tetrahydrophthalic anhydride and mixtures thereof where there is utilized in making the unsaturated polyester reaction product of (B), up to at least about 10 mole percent excess of the glycol of (i) over the aliphatically unsaturated organic dicarboxylic acid of (ii) C. 1% to 5% based on the weight of (A) and (B) of a UV sensitizer, and D. 0.05% to 1% based on the weight of (A), (B) and (C) of paraffin wax.

Claim 10

A method in accordance with claim 1, where the cure of the irradiation curable resin is achieved with UV light having a wavelength of from 1,849 A to 4,000 A.