| 摘要 |
Improved hot melt adhesives comprise a blend of a polyamide and a polyetheramide. The polyamides have the following general structure <IMAGE> wherein A is a linear, branched or cyclic aliphatic hydrocarbon radical, which can be substituted with a halogen such as chlorine or bromine, when fire retardant products are desired, and wherein B is a linear or branched, saturated or unsaturated, aliphatic hydrocarbon radical, which can be substituted with halogen such as chlorine or bromine when fire retardant products are desired. The polyamides can also contain a residue of a saturated aliphatic hydrocarbon dicarboxylic acid. The value of x of the polymer formula is generally in the range of 5 to about 500, more usually in the range of about 20 to about 100. The polyetheramides have the following general structure: (PA-Y-PE)m wherein PA represents a polyamide segment and PE represents a polyether segment, m is an integer ranging from 5 to about 100, Y is a group selected from <IMAGE> The compositions of the invention can further include polyphenol compositions and pigments. The compositions are useful as hot melt adhesives or sealants. They retain their useful properties at very low temperatures, as low as -40 DEG C.
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