Laminate of biaxially oriented polystyrene film and polystyrene foam
Patent 4011357 Issued on March 8, 1977. Estimated Expiration Date: 
March 8, 1994. 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.
March 8, 1994. 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 3234065 3481818 3619344 3649437 3791916 InventorAssigneeApplicationNo. 05/615947 filed on 09/23/1975US Classes:428/215, Absolute thicknesses specified428/318.6, Of about the same composition as, and adjacent to, the void-containing component428/319.9, Hydrocarbon polymer428/515, Next to second addition polymer from unsaturated monomers428/910PRODUCT WITH MOLECULAR ORIENTATIONExaminersPrimary: Van Balen, William J.Attorney, Agent or FirmAbstractA method for the production of laminates comprising oriented thermoplastic film heat bonded to a thermoplastic foam which comprises extrusion of a thermoplastic foam containing a blowing agent which has a plasticizing action upon the foam material and while the extruded foam still contains residual blowing agent, heat welding an oriented thermoplastic film to the foam. Disorientation of the oriented film in accord with the present method is eliminated by virtue of the lower heat bonding temperatures necessary to achieve an effective weld by virtue of the presence of the blowing agent-plasticizer material remaining in the foam. | |
