Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1981-03-27
1982-09-07
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521132, 521137, C08G 1814
Patent
active
043484891
ABSTRACT:
A modified, flexible polyurethane foam product which incorporates a three-dimensional skeletal network of a thermoplastic additive whose dielectric loss index is greater than the loss index of polyurethane foam to impart to the product an acceptable dielectric heating response in a high-frequency electric field. The additive in particulate form is introduced into the polyurethane foam-forming reaction mixture, the additive having a gell point which is lower than the temperature level of the exothermic reaction which takes place when the mixture is caused to foam and expand. The additive is further characterized by a low order of viscosity whereby when rendered molten by the exothermic reaction, the particles are extruded by the expanding urethane mass to create tentacles that interlace the cellular urethane structure to form the skeletal network.
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Ebert Michael
Welsh Maurice J.
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