Coextruded products with improved weatherability

Patent 4992322 Issued on February 12, 1991. Estimated Expiration Date:

June 23, 2008. 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.

Abstract Claims Description Full Text

Patent References

Copolyestercarbonates
Patent #: 4465820
Issued on: 08/14/1984
Inventor: Miller , et al.

Multilayered hollow polycarbonate containers
Patent #: 4513037
Issued on: 04/23/1985
Inventor: Collins

UV-Stabilized coated polyester-carbonate articles and process
Patent #: 4556606
Issued on: 12/03/1985
Inventor: Olson

Copolyester-carbonate composition
Patent #: 4559388
Issued on: 12/17/1985
Inventor: Liu , et al.

Laminate formed from a polyarylate sheet and a polycarbonate and/or polyester sheet
Patent #: 4643937
Issued on: 02/17/1987
Inventor: Dickinson , et al.

Method for making hollow multilayer multiple-wall synthetic resin panels
Patent #: 4707393
Issued on: 11/17/1987
Inventor: Vetter

Method of impregnating an ultraviolet radiation screener into the surface of polycarbonate article
Patent #: 4776913
Issued on: 10/11/1988
Inventor: Goossens , et al.

Flame resistant electrical insulating material Patent #: 4824723
Issued on: 04/25/1989
Inventor: Campbell , et al.

Inventors

Application

No. 210270 filed on 06/23/1988

US Classes:

428/215, Absolute thicknesses specified264/176.1, Shaping by extrusion428/412Of polycarbonate

Examiners

Primary: Sluby, P. C.

Attorney, Agent or Firm

Conard; Spencer D., Mufatti; William F.

Foreign Patent References

0121883 EP. 10/13/1984
3244953A1 DE. 06/13/1984
2019780 GB. 11/13/1979
2048167 GB. 12/13/1980

International Class

B32B 027/36

Abstract

A coextruded moisture resistant polycarbonate article has a relative thin moisture resistant, polyphthalate-carbonate layer adhered to a relatively thick aromatic polycarbonate corelayer. The coextruded article has the high degree of transparency of aromatic polycarbonates and the moisture resistance and haze resistance of polyphthalate-carbonate. Coextruded sheet and film of the present invention may be subsequently thermoformed without losses in the desirable properties thereof.