| Titre : |
In the heat of the night : The chemists have done it again. With some clever manipulation, PSAs can be processed at temperatures as high as 190°C, creating market opportunities |
| Type de document : |
texte imprimé |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 11-13 |
| Langues : |
Anglais (eng) |
| Catégories : |
Adhésifs sensibles à la pression
Caoutchouc styrène-butadiène
Copolymère styrène isoprène styrène
Copolymère styrène-éthylène-butadiène
Hautes températures
Stabilité thermique
|
| Index. décimale : |
668.3 Adhésifs et produits semblables |
| Résumé : |
Achieving effective high-temperature performance and durability from adhesives formulations is a common challenge facing the tape and label industry, particulraly for industrial and outdoor applications whiere extreme heat sensitivity requirements during product use are critical.
A new development in styrenic block copolymer (SBC) technology is breaking new ground in high-temperature performance for pressure sensitive adhesives (PSAs) by allowing safe processing at temperatures up to 190°C and consistent performance at temperatures as high as 120°C.
This is good news for automotive tapes, electronic data processing labels and similar applications that are required to survive the demands of high-temperature processing and retain their performance for long periods despite exposure to sun or other heat-related environments during use.
SBCs were pioneered more than 40 years ago by Kraton Polymers scientists, and are widely used in adhesives, sealants and coatings because of their performance characteristics and processing capabilities as high solids content solutions or as solvent-free hot melts.
These polymers have been particularly successful in tape and label applications where their high tack and cohesion properties enable adhesion to difficult substrates such as corrugated carboard and polyolefin surfaces, such as used in nappies (diapers).
Developments in SBC technology for pressure-sensitive adhesives based on styrene-isoprene-styrene (SIS) and styrene-butadiene-styrene (SBS) have gone some way towards achieving successful performance at elevated temperatures.
However, degradation in adhesive performance still occurs at very high temperatures - over 90°C - because of the lower thermo-oxidative resistance of the unsaturated bonds in the rubber midblock. |
| Note de contenu : |
- Features of SBCs
- Simple changes
- Formulating with SEBS
- Performance trials
- SEBS versus SIS formulations
- Optimising SEBS formulationS
- Variations with polymer content
- Temperature stability
- Table 1 : Comparison of PSA properties between SIS and SEBS formulations
- Table 2 : Comparison of PSA properties between SEBS formulations
- Table 3 : PSA properties with hydrogenated aromatic hydrocarbon resins |
| Permalink : |
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in ADHESIVE TECHNOLOGY > Vol. 19, N° 3 (06/2002) . - p. 11-13
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In the heat of the night in ADHESIVE TECHNOLOGY, Vol. 19, N° 3 (06/2002)
