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Evonik Unveils Biobased Polyester Polyols for Reactive Hotmelt Adhesives

Published on 2014-11-14. Author : SpecialChem

As the first company Evonik Industries launched a modular system of bio-based polyester polyols for reactive hotmelt adhesives, under the name DYNACOLL® Terra. These are the “green” alternatives to the petrochemical polyols, and also expand the property spectrum of the existing product range.

The DYNACOLL® Terra range includes nine medium-molecular-weight polyester polyols in which the content of renewable raw materials ranges from more than 30 to 100 percent. As in the case of the petrochemical based grades, this is a modular system consisting of amorphous, liquid, and crystalline grades; their spectrum of viscosities, melting points, and glass transition temperatures determine to a large extent the properties of the formulated PUR hotmelts such as open time, initial strength, and setting time. The bio-based formulations allow the production of reactive hotmelts with properties comparable to those of petrochemically based polyesters; in some cases the products can be even better.

In developing DYNACOLL® Terra, Evonik is underscoring its commitment to corporate responsibility and accelerating the trend in the chemical industry toward a greener future.

DYNACOLL® with inherent flame retardancy
A further development in the field of hotmelts concerns the requirements with regards to fire protection. In the past, adhesives formulators were faced with the challenge not just of developing reactive hotmelts with the required adhesive properties but also ensuring that they meet the increasing demands on fire protection in various applications. This is achieved by the addition of flame retardants, which, however, often adversely affects the adhesion properties.

Here, Evonik Industries has succeeded in developing a polyester polyol with inherent flame retardancy. The new prototype is a pasty polyester of medium molecular weight, which gives the reactive hotmelt a high degree of flexibility. In comparison to additive formulations, adhesives with the new DYNACOLL® grade have much better adhesion properties and improved chemical resistance. A corresponding patent application has already been filed.

About Evonik
Evonik, the creative industrial group from Germany, is one of the world leaders
in specialty chemicals. Profitable growth and a sustained increase in the value of the company form the heart of Evonik’s corporate strategy. Its activities focus on the key megatrends health, nutrition, resource efficiency and globalization. Evonik benefits specifically from its innovative prowess and integrated technology platforms.

Evonik is active in over 100 countries around the world. In fiscal 2013 more than 33,500 employees generated sales of around €12.7 billion and an operating profit (adjusted EBITDA) of about €2.0 billion.

Forward looking Statements
In so far as forecasts or expectations are expressed in this press release or where our statements concern the future, these forecasts, expectations or statements may involve known or unknown risks and uncertainties. Actual results or developments may vary, depending on changes in the operating environment. Neither Evonik Industries AG nor its group companies assume an obligation to update the forecasts, expectations or statements contained in this release.

Source: Evonik 

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