APAO hot melt adhesives containing a low molecular weight, functionalized, isotactic polypropylene
Adding a low molecular weight (or alternatively, high melt flow rate), functionalized, isotactic polypropylene (iPP) to a hot melt adhesive (HMA), composition containing a propylene-butene-1, and/or a propylene-ethylene amorphous poly alpha olefin (APAO) copolymer, in addition to other co-adjuvants (such as a tackifier or a plasticizer), results in an APAO-based HMA that shows improved tensile strength and bonding properties, over an HMA that contains only the propylene-butene-1 and/or the propylene-ethylene APAO copolymer (with or without a tackifier and/or a plasticizer).
1. A hot-melt adhesive comprising:
at least one propylene-butene-1 (APB) amorphous poly alpha olefin (APAO) copolymer;
at least one low molecular weight (MW), functionalized, isotactic polypropylene (iPP); and
a propylene-ethylene (APE) amorphous poly alpha olefin (APAO) copolymer.
2. The hot-melt adhesive recited in claim 1 further comprising:
a tackifier.
3. The hot-melt adhesive recited in claim 1 further comprising:
a plasticizer.
4. The hot-melt adhesive recited in claim 1 wherein the isotactic polypropylene (iPP) is a maleated iPP.