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Abstract

Hot melt adhesive compositions comprising a block copolymer, particulate mineral reinforcing agent, glass fiber and hollow inorganic silicate microspheres. The block copolymer is selected from the group consisting of copolyesters, copolyamides, copoly(esteramides) and copoly(ether-esters) melting at a temperature above about 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 particulate inorganic reinforcing agent, 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 3:4, the weight ratio of particulate mineral to glass fiber is in the range of about 1:3 to about 9:1 and the volume percentage of hollow inorganic silicate microspheres is less than about 12. The compositions are particularly useful for filling voids and cavities in substrates.

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First Claim