Radio frequency induction heatable compositions
First Claim
1. A composition comprising:
- (a) a plurality of susceptors having the capability of absorbing magnetically coupled radio frequency energy, each of said susceptors comprising a non-magnetic particle having a surface bearing a thin, continuous, magnetic film capable of absorbing magnetically coupled radio frequency energy, wherein said thin, continuous, magnetic film is in direct contact with said surface of said non-magnetic particle, said susceptors disposed in(b) a matrix non-reflective of radio frequency energy, said matrix capable of being heated when said composition is subjected to magnetically coupled radio frequency energy.
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Abstract
A composition comprising: (1) a susceptor of magnetically coupled radio frequency energy comprising a non-magnetic particulate substrate, e.g., an electrically insulative material in particulate form, bearing a thin magnetic coating, e.g., a magnetic inorganic film, and (2) a matrix that is substantially non-reflective of radio frequency energy, e.g., silicone rubber, which matrix can be heated upon the composition'"'"'s being subjected to magnetically coupled radio frequency energy. It has been discovered that thin magnetic coatings on non-magnetic particles provide energy transfer with induction heaters equal to or better than many commonly used solid susceptor particles. It has also been discovered that the temperature of the composition of this invention can be regulated so as not to exceed a predetermined temperature.
110 Citations
33 Claims
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1. A composition comprising:
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(a) a plurality of susceptors having the capability of absorbing magnetically coupled radio frequency energy, each of said susceptors comprising a non-magnetic particle having a surface bearing a thin, continuous, magnetic film capable of absorbing magnetically coupled radio frequency energy, wherein said thin, continuous, magnetic film is in direct contact with said surface of said non-magnetic particle, said susceptors disposed in (b) a matrix non-reflective of radio frequency energy, said matrix capable of being heated when said composition is subjected to magnetically coupled radio frequency energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of preparing a hot-melt adhesive capable of being heated by magnetically coupled radio frequency energy comprising the steps of:
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(a) providing non-magnetic particles, each of which has a surface; (b) depositing a thin, continuous, magnetic film on the surface of each of said non-magnetic particles; and (c) incorporating said non-magnetic particles bearing said magnetic film into a hot-melt adhesive matrix.
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30. A method of preparing a hot-melt adhesive capable of being heated by magnetically coupled radio frequency energy comprising the steps of:
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(a) providing a non-magnetic, hot-melt adhesive particle having a surface; and (b) applying a thin, continuous, magnetic film to the surface of said adhesive particle.
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31. A composition comprising:
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(a) a plurality of susceptors having the capability of absorbing magnetically coupled radio frequency energy, each of said susceptors comprising a non-magnetic particle having a surface bearing a thin, continuous, magnetic film capable of absorbing magnetically coupled radio frequency energy, wherein said thin, continuous, magnetic film is in direct contact with said surface of said non-magnetic particle, said susceptors disposed in (b) a matrix non-reflective of radio frequency energy, wherein said composition is capable of being heated when exposed to magnetically coupled radio frequency energy provided by an induction heater set at a frequency ranging from 5 to 8 MHz, said heater having a coil characterized by 5 turns of 1/4-inch outer diameter copper tubing, an inner coil diameter of 1.25 in., and a coil length of 1.75 in.
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32. A composition comprising a plurality of susceptors having the capability of absorbing magnetically coupled radio frequency energy, each of said susceptors comprising a non-magnetic particle being granular, acicular, a plate or a flake in shape and having a surface bearing a thin, continuous, magnetic film capable of absorbing magnetically coupled radio frequency energy, wherein said thin, continuous magnetic film is in direct contact with said surface of said non-magnetic particle, said susceptors disposed in a matrix non-reflective of radio frequency energy, said matrix capable of being heated when said composition is subjected to magnetically coupled radio frequency energy.
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33. A composition comprising a plurality of susceptors having the capability of absorbing magnetically coupled radio frequency energy, each of said susceptors comprising a non-magnetic particle having a surface bearing a thin, continuous, magnetic film capable of absorbing magnetically coupled radio frequency energy, wherein said thin, continuous magnetic film is in direct contact with said surface of said non-magnetic particle, said susceptors disposed in a matrix non-reflective of radio frequency energy, said matrix being polymeric or wax, and capable of being heated when said composition is subjected to magnetically coupled radio frequency energy.
Specification