Continuous process for the production of polystyrene foamed articles
Patent 4426065 Issued on January 17, 1984. Estimated Expiration Date: 
December 15, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 15, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3789095 3879507 3928182 InventorsAssigneeApplicationNo. 06/330823 filed on 12/15/1981US Classes:264/45.9, Including extrusion264/321, Sponge-like or foamed work264/53Liquid to gas phase changeExaminersPrimary: Anderson, PhilipAttorney, Agent or FirmInternational ClassesB29C 51/00 (20060101)C08J 9/00 (20060101) Foreign Application Priority Data1980-12-27 JPAbstractThis invention relates to a process for producing economically shaped article of polystyrene foam with a small wall thickness and sufficient strength by a continuous simple operation including a short forming cycle in which the sheet of polystyrene foam having a bulk density of 0.15 to 0.7 g/cm3, a thickness of 0.3 to 1.0 mm, 5 to 20 cell membranes widthwise of the sheet and a draw ratio of up to 1.25 and containing 0.03 to 0.3 mole/kg of the residual gas of the blowing agent is formed by an extruder and utilized to produce the shaped article. | |
