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Economic formulations: a new polymer has been unveiled which will result in good pressure sensitive adhesives and more economical formulations for tapes and labels.

Publication: European Adhesives & Sealants (Surrey, UK)
Publication Date: 01-SEP-04 		Format: Online - approximately 1602 words
Delivery: Immediate Online Access
Full Article Title: Economic formulations: a new polymer has been unveiled which will result in good pressure sensitive adhesives and more economical formulations for tapes and labels.(Tapes & Labels)

Article Excerpt
A new styrenic block copolymer (SBC) with a hybrid elastomer composition combining both isoprene and butadiene in the mid-block was unveiled by Kraton Polymers in 2004. The polymer is a completely new concept that will broaden the application field of SBCs in hot-melts, resulting in good pressure sensitive adhesive performances and more economical formulations for tapes, labels and non-wovens.

Until now, two families of non-hydrogenated SBC have been widely used in Hot Melt Adhesives (HMA):

* styrene--isoprene--styrene block copolymers (SIS) and

* styrene--butadiene--styrene block copolymers(SBS).

Both families have specific properties and are used in large volumes in their respective application fields. Further, with variable successes, SIS and SBS have also been combined in a single formulation for several reasons. For instance: to make economically attractive packaging tape and disposable non-woven adhesives; to improve the hot melt stability of adhesives; or to improve label converting (matrix stripping without adhesive threads).

PSA TAPES MARKET

The first member nf this new family of poly (styrene--block--isoprene/ butadiene--block--styrene)--called SIBS--has been designed primarily to serve the PSA tapes market.

The polymer, Kraton MD-6455 polymer, has a low polystyrene content (19%), a low molecular weight for low hot-melt viscosity, tailor made di-block content (30%) and an optimised isoprene/butadiene structure. This article highlights the beneficial and sometimes unexpected properties that the development of such novel chemistry brings to the Pressure Sensitive Adhesive (PSA) market.

PROPERTIES OF THE NEW SIBS BLOCK COPOLYMER

The hybrid elastomer...

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