Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1984-11-05
1987-06-02
Czaja, Donald E.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156242, 156252, 156256, 1563096, 264156, 264273, 428139, 428922, B32B 0310, B32B 3120, B29C 4320
Patent
active
046700757
ABSTRACT:
A method of making an electrically-conductive floor covering presses a polymeric bottom layer into apertures in a top layer having a higher flow viscosity than the bottom layer, the pressure also bonding the layers together. The bottom layer contains from about 3% to about 80% by weight carbon black or graphite for electrical conduction; the top layer contains not more than about 0.5% thereof. The apertures in the top layer are at least 1 mm in diameter and regularly or irregularly spaced from the next adjacent aperture from about 2 mm to about 40 mm, the area of the apertures not exceeding 40% per unit area of the top layer. The dark color of the bottom layer resulting from its carbon black or graphite content therefore need not significantly affect the appearance of the top layer, but provides electrical conductivity through the apertures.
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Graab Gerhard
Heckel Klaus
Kuhl Hans-Michael
Czaja Donald E.
Firma Carl Freudenberg
Hoch Ramon R.
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