Thermoplastic resin-coated metallic substrate and the method of producing the same
First Claim
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1. A protectively coated wire comprising a metallic wire substrate and bonded to said substrate a polyamide resin hot melt adhesive, said polyamide hot melt adhesive comprising the condensation product of alkylene diamines of the formula:
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space="preserve" listing-type="equation">H.sub.2 N(CH.sub.2).sub.x NH.sub.2,wherein x is an integer of from 2 to 20; and
polymeric fat acids having a dimeric fat acid content greater than about 90 percent by weight;
the molar equivalent of amine employed being about equal to the molar equivalent of carboxyl groups present in said fat acid;
said condensation product having a softening point of 112°
C. to 138°
C. and a tensile strength of from 400 pounds per square foot to 600 pounds per square foot; and
a second ply in a thickness of at least 0.015 inch of an extrudable thermoplastic resin adhering to said substrate by means of said adhesive.
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Abstract
A metallic substrate and a thermoplastic resinous coating are bonded to one another by a resinous hot melt adhesive. The method of applying the coating to effect the bond includes applying to the metallic substrate a resinous hot melt polyamide adhesive composition which has been found to adhere firmly to the metallic substrate and to form a secure bond with the molten thermoplastic resin extruded onto said hot melt adhesive at high rates of speed.
25 Citations
38 Claims
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1. A protectively coated wire comprising a metallic wire substrate and bonded to said substrate a polyamide resin hot melt adhesive, said polyamide hot melt adhesive comprising the condensation product of alkylene diamines of the formula:
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space="preserve" listing-type="equation">H.sub.2 N(CH.sub.2).sub.x NH.sub.2,wherein x is an integer of from 2 to 20; and
polymeric fat acids having a dimeric fat acid content greater than about 90 percent by weight;
the molar equivalent of amine employed being about equal to the molar equivalent of carboxyl groups present in said fat acid;
said condensation product having a softening point of 112°
C. to 138°
C. and a tensile strength of from 400 pounds per square foot to 600 pounds per square foot; and
a second ply in a thickness of at least 0.015 inch of an extrudable thermoplastic resin adhering to said substrate by means of said adhesive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20)
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19. A continuous process for applying and bonding a protective coating to a metallic wire substrate that comprises applying to a length of said substrate advancing at a rate of at least 200 feet per minute, a first ply of a molten polyamide resin hot melt adhesive;
- said polyamide hot melt adhesive comprising the condensation product of one or more alkylene diamines of the formula;
space="preserve" listing-type="equation">H.sub.2 N(CH.sub.2).sub.x NH.sub.2,wherein x is an integer of from 2 to 20; and
polymeric fat acids having a dimeric fat acid content greater than about 90 percent by weight;
the molar equivalent of amine employed being about equal to the molar equivalent of carboxyl groups present in said fat acids;
said condensation product having a softening point of 112°
C. to 138°
C. and a tensile strength of from 400 pounds per square foot to 600 pounds per square foot;
cooling the said adhesive composition to a flow resistant state;
extruding a molten extrudable thermoplastic resin composition onto said adhesive composition at a temperature within the range of 300°
C. to 425°
C. in a thickness of at least 0.015 inch whereby said adhesive composition is softened; and
cooling, whereby said thermoplastic resin composition is bonded to said substrate by means of said adhesive composition. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
- said polyamide hot melt adhesive comprising the condensation product of one or more alkylene diamines of the formula;
Specification