Improving Tack, Elongation & Peel in Hot Melt Styrene Block Copolymer Adhesives
SpecialChem |
Andrew Extance
- Mar 7, 2012
Sometimes, innovations emerge that force existing guidelines for formulating adhesives to be rethought. The principles, abilities and limitations of using styrene block copolymers (SBCs) in hot melt adhesives are well-known. But could it be possible that thinking beyond standard block copolymer architectures can provide additional capabilities to those delivered by traditional polymers and additives? SBC hot-melt adhesives rely on these copolymers' structure of rubbery mid-blocks connected by hard polystyrene end blocks that untangle and melt at raised temperatures
Study confirms understanding of PSA debonding process - Mar 07, 2012
posted by Werner Hoermann, R&D - Applied/ Formulation/ Product development at W.R. Grace
The tapered transition from the elastic to the plastic part of the SBC softens the impact on the bond line when the midblock is stretched to its limit, thus slowly building up the stress on the adhesion, so the results are not that surprising.
I am looking forward to formulating with these new SBC's.
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