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US 5,424,016 AGranted
Method for providing accelerated release of a blowing agent from a plastic foam
AssigneeThe Dow Chemical Company
InventorPaul A. Kolosowski
Life of this patent
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Abstract
Disclosed is a method for providing accelerated release of a flammable blowing agent from a plastic foam. The method comprises (a) providing the plastic foam having the blowing agent and a permeability modifier therein and (b) perforating the foam at its surface to form a multiplicity of channels extending from the surface into the foam. The channels are in gaseous communication with the environment outside the foam structures and provide accelerated released of blowing agent.
Claims20
A method for providing accelerated release of a blowing agent from an extruded plastic foam, comprising:
- a) providing an extruded plastic foam having the blowing agent and a permeability modifier therein;
- b) perforating the foam at its surface to form a multiplicity of channels extending from the surface into the foam, the foam being perforated to form channels therein free of direction with respect to the longitudinal extension of the foam.
Dependencies are inferred from the claim text.