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Polyimide/THV/PTFE Laminated Tape

IP.com Disclosure Number: IPCOM000245949D
Publication Date: 2016-Apr-19
Document File: 1 page(s) / 12K

Publishing Venue

The IP.com Prior Art Database

Abstract

Polyimide (PI) is an important insulation material for wire and cable due to its thermal and dielectric properties. PI/Polytetrafluoroethylene (PTFE) is one kind of composite material combination in which the PTFE serves as a bonding material to seal the overlaps of the layers of PI tape. The investigators found that tetrafluoroethylene-hexafluoropropylene-vinyldiene fluoride terpolymer (THV) could be added to a PI/PTFE laminate by pre-coating a THV dispersion on unsintered PTFE tape and then laminating the pre-coated tape with a PI tape under heat and pressure. The laminate structure gives the advantages of easy preparation, good coverage of PTFE, uniform thickness, and good adhesion strength.

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Polyimide/THV/PTFE Laminated Tape

Polyimide (PI) is an important insulation material for wire and cable due to its thermal and dielectric properties. PI/Polytetrafluoroethylene (PTFE) is one kind of composite material combination in which the PTFE serves as a bonding material to seal the overlaps of the layers of PI tape.

The investigators found that tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer (THV) could be added to a PI/PTFE laminate by pre-coating a THV dispersion on unsintered PTFE tape and then laminating the pre-coated tape with a PI tape under heat and pressure. The laminate structure gives the advantages of easy preparation, good coverage of PTFE, uniform thickness, and good adhesion strength.

A four-layer sandwich structure was made with following the layers: PI/THV/PTFE/THV.

The structure was laminated under heat and pressure from the following materials:

PI: film, thickness = 50 µm
PTFE: unsintered tape, thickness = 20 µm, specific gravity = 0.269
THV: a 10% solution in acetone of fluoroplastic agglomerate, available under the trade designation "3MTM DyneonTM Fluoroplastic Agglomerate THV 221AZ" from 3M Company, St. Paul, MN, applied to PTFE tape by dipping the tape in the solution and drying.

Results are provided in the table below for adhesion between PI and PTFE layers in laminates subjected to heat treatments at 290C and 350C.

Results: Adhesion between PI and PTFE layers in laminate

Sample

Specific gravity Adhesion...