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Desmodur® prepolymer technology for high-performance cast PU elastomers

Cast polyurethane elastomers are used in a wide range of applications where elasticity, a long service life and excellent wear resistance are required. Desmodur® prepolymer technology from Covestro gives polyurethane elastomer manufacturers the freedom to meet all of their customers’ demanding application needs.

Prepolymer technology – Jean-Bernard Lassara – Charlène Maisonneuve –

Polyurethane elastomers are prepared from the reaction of diisocyanates, long-chain polyols and short-chain extenders. By varying each component, the properties of polyurethane elastomers can be tuned to meet the needs of specific applications.

These prepolymers consist of a reaction between diisocyanates:

  • Toluene diisocyanate (TDI)
  • Diphenylmethane diisocyanate (MDI)
  • Aliphatic and unconventional isocyanates

and polyether/polyester polyols such as:

  • Polypropylene glycol (PPG)
  • Polytetramethylene ether glycol (PTMEG)
  • Polyadipate
  • Polycaprolactone
  • Unconventional polyols

Cast polyurethane elastomers are formed when these prepolymers react with chain extenders followed by curing to generate three-dimensional structures.

The Desmodur® line of prepolymers includes:

  • Conventional TDI and MDI-terminated polyether and polyester-based prepolymers processed using hot casting methods
  • Mercury-free MDI systems
  • Prepolymers with low unreacted TDI content for reduced operator exposure to TDI
  • Quasi-MDI prepolymers with ether or ester backbones
  • Amine cross-linked MDI prepolymers with processing profiles comparable to TDI prepolymers
  • Prepolymers terminated with specialty diisocyanates
  • With its extensive expertise in polyurethane chemistry and broad portfolio of Desmodur® systems, Covestro can help polyurethane elastomer manufacturers find the best prepolymer technologies for all of their applications.

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