ABSTRACT
Hot-melt
(HM) adhesives offer advantages over their contemporary water-based and
solvent-based adhesives like low volatile organic compounds (VOCs), 100% solid,
fast drying, setting etc. In recent years, to reduce their dependence on
dwindling petroleum resources and due to the enormous use of HM adhesives in
packaging areas that demand 100% recyclability, efforts have been devoted to
making these formulations completely bio-based, sustainable and biodegradable.
In this attempt, research and developments have been focused on using starch,
modified starch, soy protein, polylactides, polyamides, lignin and vegetable
oils as a partial/fully replacement to the petrochemical-based polymers. The huge
amount of research going on in the field of bio-based polymers has still not
reached its complete potential in the field of HM adhesives. In this review
paper, HM
adhesives based on sustainable raw materials namely starch, modified starch,
polyamides, poly (lactic acid), soy protein and lignin are discussed.