Copolyester melt adhesive having improved flow characteristics containing di- and tri-benzoate modifier

Claim 1

An improved hot melt adhesive composition comprising a copolyester of terephthalic acid or derivatives thereof; adipic acid or derivatives thereof; ethylene glycol or derivatives thereof; and 1,4-butanediol or derivatives thereof, wherein the acid components and the diol components are present in a 1:1 molar ratio, said copolyester having a mole ratio of terephthalic acid to adipic acid within the range of about 60:40 to about 80:20, a mole ratio of ethylene glycol to 1,4-butanediol within the range of about 60:40 to about 80:20, a softening point within the range of about 80°-160° C., and an inherent viscosity of at least 0.5 as measured at 25° C. using 0.25 grams of copolyester per 100 ml. of a solvent consisting of 60 percent by weight phenol and 40 percent by weight tetrachloroethane, and a modifying amount of a compound selected from glyceryl tribenzoate, triethylene glycol dibenzoate, trimethylolethane tribenzoate, and neopentyl dibenzoate.