Pressure sensitive tape for forming water-tight field joints in rubber membranes
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United States of America Patent
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Mar 31, 1998
Issued Date -
N/A
app pub date -
Mar 20, 1997
filing date -
Nov 9, 1994
priority date (Note) -
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Abstract
An adhesive roofing tape is based on a combination of brominated butyl rubber and EPDM. A non-diene block terpolymer is interspersed in the cross-linked polymer network. A plasticizer and tackifier are included to provide resiliency and permanent tack. An important aspect of the invention is to use a high molecular weight polyisobutylene plasticizer and a peroxide curing system. Rapid crosslinking without concomitant rapid degradation of the brominated butyl rubber occurs and some limited degradation of the plasticizer contributes to surface tack. A method of making the adhesive roofing tape is also provided.
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