Polyester/substantially amorphous polyolefin hot-melt adhesive blends

Claim 1

An adhesive composition capable of being used as a hot melt adhesive comprising a blend of about 1 to 20 percent by weight of at least one substantially amorphous polyolefin and at least one polyester having a heat of fusion of about 1 to about 12 calories per gram, a melting point within the range of about 80° C. to 225° C., and an inherent viscosity of at least 0.5 as measured at 25° C., using 0.50 gram of polyester per 100 ml. of a solvent consisting of 60 percent by volume phenol and 40 percent by volume tetrachloroethane, wherein said substantially amorphous polyolefin is a member of the group selected from substantially amorphous homopolymers of 1-olefins containing 3 to 5 carbon atoms, substantially amorphous copolymers prepared from ethylene and 1-olefins containing 3 to 5 carbon atoms, substantially amorphous copolymers prepared from propylene and 1-butene, substantially amorphous copolymers prepared from amorphous propylene and a higher 1-olefin containing less than 65 mole percent of at least one higher 1-olefin of the group consisting of 1-hexene, 1-heptene, 1-octene, 1-nonene and 1-decene, and substantially amorphous copolymers prepared from 1-butene and a higher 1-olefin containing less than 65 mole percent of at least one higher 1-olefin of the group consisting of 1-hexene, 1-heptene, 1-octene, 1-nonene and 1-decene.