The Polyethylenimines (Lupasol^®) from BASF are branched spherical polymeric amines. Due to their high charge density they adsorb tightly on negatively charged surfaces. This mode of action can be applied to a huge variety of materials, such as cellulose, polyesters, polyolefines, polyamides, and metals, and provides visible advantages to the user.

Lupasol^® is the ideal adhesion promoter between different types of plastics or between plastics and polar substrates, such as polyolefine films and paper.
Lupasol^® improves dye acceptance, paintability, and barrier properties
In lamination inks, Lupasol^® acts as a tie-bond for the plastic film placed over the substrate.

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Lupasol^®