C - Chemistry – Metallurgy – 09 – J
Patent
C - Chemistry, Metallurgy
09
J
117/26, 18/783
C09J 7/02 (2006.01) B29C 47/06 (2006.01)
Patent
CA 1339399
The present invention relates to reinforced pressure-sensitive adhesive tapes, and to a method and apparatus for making these tapes. Reinforced tapes, also known as filament tapes, generally comprise a backing having adhered to one major surface thereof a plurality of yarns, which comprise a multiplicity of glass or synthetic polymeric filaments, by means of an adhesive. Alternatively, the yarns can be replaced by individual filaments. Typically, a layer of pressure-sensitive adhesive is then applied over the yarn- or filament-bearing surface of the tape. Although filament tapes are extremely useful, the cost of making them is high because of the high cost of filaments and the high cost of processing. In order to reduce the cost of making filament-reinforced tapes, some manufacturers have resorted to reducing the number of filaments adhered to the backing. However, this expedient reduces the tear strength of the tape. The present invention provides a tape comprising a backing bearing on at least one major surface thereof a plurality of ribs disposed substantially longitudinally thereon, and further bearing on at least one major surface thereof a layer of adhesive. The ribs are joined to the backing such that the contact angle between the ribs and the surface of the backing ranges from about 10° to about 160°. At least 50% of the cross-section of the ribs must project from the rib-bearing surface of the tape. It is preferred that the adhesive be a pressure-sensitive adhesive. The tape of this invention can be prepared by means of coextrusion techniques.
597787
Gordier Robert L.
Leseman Ronald P.
Smart & Biggar
The Minnesota Mining & Manufacturing Company
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