Coated bonding tapes having improved peel strength combined with

Details Coated bonding tapes having improved peel strength combined with Coated bonding tapes having improved peel strength combined with

1982-06-29

1984-04-03

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Adhesive outermost layer

428 31, 428323, 428331, 428492, 428519, 428913, C09J 702, B60R 1300

Patent

active

044408293

ABSTRACT:
A coated bonding tape having improved peel strength combined with low temperature flexibility is disclosed in which a layer of impact-resistant material constituted 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 thickness reduction at a pressure below 800 psi. 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.

REFERENCES:
patent: 3896245 (1975-07-01), Seto et al.
patent: 4061805 (1977-12-01), Thompson et al.

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