Cavity filling with a hot melt adhesive composition

Details Cavity filling with a hot melt adhesive composition Cavity filling with a hot melt adhesive composition

1978-10-04

1980-07-22

Lawrence, Evan K.

Coating processes

Restoring or repairing

Metal article

260 37M, 260 37N, 260 40R, 427140, 427277, B23P 704

Patent

active

042140196

ABSTRACT:
A method of filling a cavity in a substrate which comprises applying excess adhesive composition as a hot melt into the cavity, spreading the adhesive composition to fill the cavity, cooling the adhesive composition and sanding the composition to provide a surface even with the surrounding substrate. The adhesive composition comprises a block copolymer, aluminum powder, glass fiber and hollow inorganic silicate microspheres. The block copolymer is selected from the group consisting of copolyesters, coplyamides, copoly(esteramides) and copoly(ether-esters) melting at a temperature above 150.degree. C. and having from about 30 to about 70 weight percent of hard segments and from about 70 to about 30 weight percent of soft segments. The weight ratio of block copolymer to aluminum powder, glass fiber and silicate microspheres is in the range of about 3:7 to about 3:2, the weight ratio of block copolymer to glass fiber is at least about 2:1, the weight ratio of glass fiber to aluminum powder is at least about 1:9 and wherein the volume percentage of silicate microspheres is less than about 10.

REFERENCES:
patent: 3650999 (1972-03-01), Martins et al.
patent: 4073973 (1978-02-01), Martins et al.
patent: 4097445 (1978-06-01), Martins et al.
patent: 4125571 (1978-11-01), Scott et al.
Q-Cel Microspheres Product Bulletin, QC-10, PQ Corporation.

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