Kraton Polymers: Chemical crosslink for SBC

A new crosslinking technology for styrene block copolymers which imparts higher temperature resistance has been developed by Kraton Polymers. SBCs produced by Kraton are ultraviolet or electron beam cured to give a crosslinked structure, but this is physical and not chemical and so is reversible - when the polymer is heated above 90 degC it begins to soften.
The new technology uses aluminium acetylacetonate as a crosslinking agent, reinforcing the physical crosslinking and increasing the softening point to about 150 degC.
Chemical crosslinking now opens potential for Kraton SBC applications under the bonnet, and also adds resistance to solvents and PVC plasticisers, enabling them to be used in adhesives on PVC film labels.

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