EPDM flashing compositions

Details EPDM flashing compositions EPDM flashing compositions

1996-02-21

1998-09-08

Warzel, Mark L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

524476, 524484, 524487, 524495, 524525, 524528, 524571, C08L 2316

Patent

active

058046615

ABSTRACT:
An EPDM flashing composition comprises 100 parts by weight of an elastomeric polymer comprising from about 85 to 100 parts by weight of at least one ethylene-propylene-diene terpolymer having up to about 2 percent by weight crystallinity and from 0 to about 15 parts by weight of an ethylene-propylene-diene terpolymer having more than 2 percent by weight crystallinity; from about 40 to 120 parts by weight of a filler selected from the group consisting of reinforcing and non-reinforcing materials and mixtures thereof, per 100 parts of the polymer; from about 40 to 105 parts by weight of a processing material and mixtures thereof, per 100 parts of the polymer; and from about 0.5 to 6 parts by weight of a cure package, per 100 parts of the polymer, the cure package comprising from about 0.1 to 1.25 parts by weight sulfur and from 0.4 to 5 parts by weight of at least one sulfur vulcanizing accelerator and being devoid of hexasulfides and thioureas. The uncured EPDM flashing composition has a longer shelf-life than current uncured, calendered commercial EPDM flashing materials, and meets the flexibility, extensibility and green strength requirements and cure characteristics desired of comer flashing compositions. Preferably, the composition has a Mooney viscosity (ML/1+4 at 135 .degree. C.) of less than about 35 Mooney units and a green strength at break of less than 65 psi.

REFERENCES:
patent: 4461875 (1984-07-01), Crepeau
patent: 4514442 (1985-04-01), Crepeau
patent: 4666785 (1987-05-01), Crepeau
patent: 4732925 (1988-03-01), Davis
patent: 4778852 (1988-10-01), Futamura
patent: 5096743 (1992-03-01), Shoenbeck
patent: 5389715 (1995-02-01), Davis
patent: 5504136 (1996-04-01), Davis et al.

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