Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1990-06-14
1992-01-21
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 463, 264 464, 264 48, 264 50, 264565, 264569, 264173, 2642093, 2642102, 264321, 264211, 425 4C, B29C 4790
Patent
active
050826085
ABSTRACT:
The method of making polystyrene foam for foam products which includes utilizing atmospheric gases as the blowing agents or preferably mixing one or more of these gases and a blending agent which is non-volatile at the extrusion temperatures, introducing the mixture to a molten thermoplastic polystyrene resin containing nucleating agents such as sodium bicarbonate and citric acid and extruding the thermoplastic in the form of a foam. The resultant foam has substantially no residual blowing agent, is dimensionally stable at ambient temperatures and when used with a non-volatile blending agent can be made with small amounts of blowing agent permitting cooling of the melt without high loading on the extruder. The foam may be coextruded with one or more layers of thermoplastic films so that the resultant product is adpated for use for plates, cups, food containers or packaging and for labells for containers such as glass and plastic containers and for labels that are shrunk in place on a container.
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Blackwelder Maurice W.
Karabedian James A.
Owens-Illinois Plastic Products Inc.
Thurlow Jeffery
Vargot Mathieu
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