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
Patent
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.
Collins James A.
Juba Bernard T.
H. B. Fuller Company
Meshbesher Thomas M.
Thurlow Jeffery R.
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