Sealant system for burial vault and method of application

Details Sealant system for burial vault and method of application Sealant system for burial vault and method of application

1975-04-28

1976-09-28

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

52135, 52141, 260 27R, 260 336PQ, 264256, 264268, B32B 1312, E04H 1300

Patent

active

039832066

ABSTRACT:
The disclosed heterogeneous hot-melt sealant system is particularly well suited to sealing the typical tongue-and-groove joint between the base and cover of a burial vault. The hot-melt system comprises a plurality of layers, each layer being a distinct phase which resists chemical or morphological penetration (e.g. paraffin oil migration) from the adjacent layer. The layers are typically applied to the groove in the cover for the vault by individual casting or pouring of each of a plurality of hot-melt compositions in the molten state. Each hot-melt composition comprises an essentially amorphous polypropylene, a hydrocarbon resin (e.g. synthetic terpene resin), and a hydrocarbon (e.g. paraffin) oil. The first (bottom) poured hot-melt contains more polypropylene and less oil and terpene resin than the second (upper) pour. The plurality of layers co-operate to provide a variety of properties including fast sealing (even at low temperatures) and low temperature flexibility (primarily contributed by the upper pour) and good long-term hydrostatic pressure resistance (primarily provided by the bottom pour).

REFERENCES:
patent: 2018941 (1935-10-01), Begun et al.
patent: 2027483 (1936-01-01), Keller
patent: 2265876 (1941-12-01), Sleichter
patent: 3787545 (1974-01-01), Chandler et al.

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