Evonik

Dynasylan 6490

Reactive vinyl siloxane oligomer, methoxy functional

Dynasylan 6490 is a vinyl silane concentrate (oligomeric siloxane) containing vinyl and methoxy groups.

Dynasylan 6490 is an excellent compatibiliser between inorganic fillers (e.g. kaolin, MDH, ATH) and organic polymers (e.g. EPDM, EVA, PE).

Key Features

The high boiling point of Dynasylan 6490, together with its high flash point, gives it outstanding advantages with respect to safety and handling during processing. From an environmental viewpoint it should be noted that the amount of released hydrolysis methanol (VOC) is significantly reduced compared to monomeric vinyl silanes.

Recommended Applications

A major field of application for mineral-filled compounds is the cable industry. EPDM and EVA can be processed into highly filled cable compounds through the adhesion promoting and hydrophobising effect of Dynasylan 6490.

The EPDM and EVA polymers with Dynasylan 6490 are for the halogen-free, non-toxic, environmentally-friendly flame retardant cable compounds (HFFR) based on ATH and MDH.

In addition, Dynasylan 6490 can be used in many other applications such as filler and pigment coating, dispersions etc. typical property improvements obtained by using Dynasylan 6490 in filled polymers are:

  • Improved filler dispersion
  • Good processability significantly
  • Reduced water-uptake
  • Excellent balance between tensile strength and elongation at break at a high level
  • Improved chemical resistance
  • Strongly reduced tendency to stress cracking
  • Higher impact strength
  • Higher abrasion resistance