Title:
PEN-PET-PEN POLYMERIC FILM
Document Type and Number:
WIPO Patent Application WO2001096107
Kind Code:
A3
Abstract:
A polymeric film comprising a first layer which comprises (a) a mixture comprising 50-99.9% by weight polyethylene terephthalate (PET) and 0.1-50% by weight of polyethylene naphthalate (PEN) or (b) a copolymer comprising 50 - 99.9% by weight ethylene terephthalate units and 0.1 - 50% by weight ethylene naphthalate units, based on the total weight of the first layer, further comprising a second layer comprising PEN and a third layer comprising PEN, and further comprising a first intermediate layer and a second intermediate layer, wherein each of said intermediate layers comprises (a) a mixture comprising 50-99.9% by weight polyethylene terephthalate (PET) and 0.1-50% by weight polyethylene naphthalate (PEN) or (b) a copolymer comprising 50 - 99.9% by weight ethylene terephthalate units and 0.1 - 50% by weight ethylene naphthalate units, based on the total weight of the layer, and wherein the first intermediate layer is interposed between the first and second layers and the second intermediate layer is interposed between the first and third layers. The invention further relates to a method of producing such a polymeric film. The polymeric film can be used as insulation in an electric motor or generator and in a magnetic medium or in packaging material.
Inventors:
NAYLOR CHRISTOPHER CHARLES
OLEK ANTON RICHARD
OLEK ANTON RICHARD
Application Number:
PCT/US2001/018951
Publication Date:
July 04, 2002
Filing Date:
June 13, 2001
Export Citation:
Assignee:
DUPONT TEIJIN FILMS US LTD PAR (US)
International Classes:
B32B27/36; C08L67/02; (IPC1-7): B32B27/36; C08L67/02
Other References:
DATABASE WPI Section Ch Week 199122, Derwent World Patents Index; Class A23, AN 1991-160618, XP002160364
PATENT ABSTRACTS OF JAPAN vol. 018, no. 037 (M - 1545) 20 January 1994 (1994-01-20)
DATABASE WPI Section Ch Week 199435, Derwent World Patents Index; Class A23, AN 1994-282970, XP002160365
DATABASE WPI Section Ch Week 198809, Derwent World Patents Index; Class A23, AN 1988-060962, XP002160366
DATABASE WPI Section Ch Week 199905, Derwent World Patents Index; Class A85, AN 1999-053069, XP002160367
DATABASE WPI Section Ch Week 198906, Derwent World Patents Index; Class A23, AN 1989-041530, XP002160368
PATENT ABSTRACTS OF JAPAN vol. 018, no. 037 (M - 1545) 20 January 1994 (1994-01-20)
DATABASE WPI Section Ch Week 199435, Derwent World Patents Index; Class A23, AN 1994-282970, XP002160365
DATABASE WPI Section Ch Week 198809, Derwent World Patents Index; Class A23, AN 1988-060962, XP002160366
DATABASE WPI Section Ch Week 199905, Derwent World Patents Index; Class A85, AN 1999-053069, XP002160367
DATABASE WPI Section Ch Week 198906, Derwent World Patents Index; Class A23, AN 1989-041530, XP002160368
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