C - Chemistry – Metallurgy – 09 – J
Patent
C - Chemistry, Metallurgy
09
J
117/25
C09J 7/02 (2006.01)
Patent
CA 1204346
-13- COATED BONDING TAPES HAVING IMPROVED PEEL STRENGTH COMBINED WITH LOW TEMPERATURE FLEXIBILITY ABSTRACT A coated bonding tape having improved peel strength combined with low temperature flexibility is disclosed in which a layer of impact-resistant material constitu- ted by a milled layer of pigmented and plasticized elastomer is coated with a pressure-sensitive adhesive coating and in which the elastomer layer consists essentially of butyl rubbers, pigment and sufficient plasticizer for the elastomer to provide a half thick- ness reduction at a pressure below 800psi. At least about 45% of the butyl rubber is cross-linked, at least about 20% of the butyl rubber is noncross-linked and has an average molecular weight of at least about 250,000, and at least about 60% of the pigment is of reinforcing character, the proportion of plasticizer providing a tape body having a strength of at least about 30 psi before plastic flow begins, and the pressure-sensitive adhesive coating is selected to provide a bond to the tape body which is strong enough to force the bonding tape to fail cohesively when peeled from a substrate.
427279
Adams Jeffery D.
Gerace Michael J.
Fetherstonhaugh & Co.
Protective Treatments Inc.
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