Coating processes – With stretching or tensioning – Running lengths
Patent
1984-03-05
1985-04-23
Thomas, Alexander S.
Coating processes
With stretching or tensioning
Running lengths
4272071, 2642884, 2642902, 156229, B32B 3116
Patent
active
045130280
ABSTRACT:
An adhesive tape comprises a base sheet of a polypropylene resin, an adhesive layer formed on one side of the base sheet and a roughened surface layer formed on the other side of the base sheet and composed of a polypropylene resin containing fine inorganic filler particles, in which the roughened surface layer has a thickness of not more than the maximum particle diameter of said fine inorganic filler particles and is substantially free from voids or cracks, and the total percent light transmittance of the tape is at least 90%. Such an adhesive tape is produced by a process which comprises forming an adhesive layer on one side of a base sheet of a polypropylene resin and a surface layer of a polypropylene resin having a melting point lower than that of the polypropylene resin of the base sheet and containing fine inorganic filler particles, on the other side of the base sheet to obtain an unstretched laminated sheet, and then stretching the laminated sheet at a temperature of at least the melting point of the polypropylene resin of the surface layer to bring the thickness of the surface layer to be not more than the maximum particle diameter of said fine inorganic filler particles.
REFERENCES:
patent: 4447485 (1984-05-01), Aritake
Mitsubishi Plastics Industries Limited
Thomas Alexander S.
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