Pressure sensitive tape for forming water-tight field joints in

Details Pressure sensitive tape for forming water-tight field joints in Pressure sensitive tape for forming water-tight field joints in

1997-12-22

2000-09-19

Wilson, Donald R.

Stock material or miscellaneous articles

Layer or component removable to expose adhesive

Sectional layer removable

428355AK, 428355BL, 428447, 428451, 524521, 524528, 525235, 525240, B32B 712, C08L 2316, C08L 2322, C08L 2328

Patent

active

061208698

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.

REFERENCES:
patent: 4742119 (1988-05-01), Close
patent: 4855172 (1989-08-01), Chiu
patent: 5234987 (1993-08-01), Hubbard et al.
patent: 5242727 (1993-09-01), Bridell et al.
patent: 5686179 (1997-11-01), Cotsakis et al.
patent: 5733621 (1998-03-01), Cotsakis et al.

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