Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1984-02-27
1986-08-26
Gallagher, John J.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
29592E, 156249, 156254, 1562731, 156292, 1563066, 1563096, 156311, 156344, 248 1, 248359, 264248, 307400, 428 76, 428212, 428900, B32B 3100, B32B 3120
Patent
active
046081097
ABSTRACT:
A method for producing stable, layered electrets includes the steps of placing a thin sheet of glassy polymer or copolymer of high molecular weight, such as polyethylene terephthalate, between two, somewhat larger in planform, sheets of polyvinyl chloride and/or polyvinyl acetate formulation, to form a sandwich structure which is then compressed and heated to approximately 300.degree. F. At this temperature the exterior polyvinyl chloride or copolymer sheets are polarized and displaced under pressure over the interior sheet to charge the interfaces of the exterior and interior sheets. The heat, furthermore, bonds the peripheral edges of the larger exterior sheets to each other thus forming a hermetically closed container within which the charged interfaces will reside. Alternatively, two or more sheets of electret (polymer) material may be pressed and heated against each other to a point where plastic deformation occurs but below melting. At this point surface charges on each sheet induce internal charges or polarization which is then fixed by rapid cooling.
REFERENCES:
patent: 4275112 (1981-06-01), Savage
patent: 4440591 (1984-04-01), Pook
Bak-Boychuk I. Michael
Gallagher John J.
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