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Bayer Polymers extends its range of raw materials for reactive hot melts

Published on 2003-09-26. Author : SpecialChem

 

Polyurethane hot melts have for years been among the fastest growing segments in the widely diversified range of polyurethane-based adhesives. There are good reasons for this; polyurethane hot melts are formulated without solvent and combine the positive properties of standard hot melts with the advantages of thermosetting adhesives. At typical processing temperatures, the adhesives have very good wetting properties and the subsequent reaction with atmospheric moisture produces high-strength bonds with excellent long-term service properties. Bayer Polymers, a division of Bayer AG, will showcase two new polyester-based raw materials and one new polyurethane additive at Feica 2003 in Lisbon, Portugal, from September 17 -; 19, 2003. These materials allow the use of polyurethane hot melts in applications in which short cycle times and high initial strength are specified.

The fast crystallizing polymer, Desmophen® XP 2527, was developed with the aim of achieving a significant increase in productivity. Its high rate of crystallization above 50 °C allows the formulation of adhesives with particularly short cycle times. The new amorphous polyester, Desmophen® XP 2462, on the other hand, is noted for its constant rise in viscosity throughout the entire application process -; attributable to its glass transition temperature of 30 °C. This enables a genuine fine-tuning of the entire bonding process, with the possibility to adapt the initial strength, open time and rheological characteristics to the specific requirements over a relatively broad range.

Both products are important additions to Bayer Polymers' comprehensive line of MDI monomer products and polyether and polyester resins, which cover a broad range of applications.

Another useful product is Desmomelt® XP 2531, a polyurethane additive for improving initial strength on substrates containing a plasticizer. It is a low molecular weight, crystallizing polyester polyurethane which can easily be dissolved in the polyol formulation before the prepolymerization stage.

source:Leverkusen


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