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Wednesday, 18 September 2019
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Raw materials & technologies

Adhesives: Stable waterbased dispersion allows new application options

Monday, 13 October 2014

Evonik has expanded its product family of amorphous poly-alpha-olefins.

The dispersion based mainly on non-polar poly-alpha-olefins with a solid content of nearly 50%. Source: Maren Beßler/Pixelio

The dispersion based mainly on non-polar poly-alpha-olefins with a solid content of nearly 50%. Source: Maren Beßler/Pixelio

In addition to the currently available thermoplastic and reactive grades, it is now offering a newly developed stable aqueous dispersion. The new type is introduced to the market as "Vestoplast W-1750”. Based mainly on non-polar poly-alpha-olefins, and with a solid content of nearly 50% this dispersion rounds off the existing product range.

The dispersion combines low viscosity with high shear stability, ensuring good ease of formulation. The advantages are evident in carpet manufacturing. Its low application viscosity is conducive to good wetting of the substrate, which in turn leads to filament bonding, particularly after thermal activation. The use of the product, which can be applied by spraying or even by commonly used latex coating machines, results in carpets of equal performance but better recyclability.

In addition to its use in filament bonding, the product also works as a hot melt for carpet backing; production can therefore be based on a single adhesive, without the need for additional intermediate layers. Apart from its use in the manufacture of carpets, it shows good effects used as additive in PU dispersions with regard to water repellency and wetting behavior: the contact angle is nearly doubled, i.e. PU-dispersions achieve full hydrophobicity and surface energy is cut, so that wetting of also non-polar substrates is possible.

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