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Kraton Uncovers SEBS Block Copolymer for Sealants & HMAs

Published on 2016-09-23. Author : SpecialChem

HOUSTON -- Kraton has introduced Kraton G1653 a styrene-ethylene-butylene-styrene (SEBS) block copolymer. With lower molecular weight than Kraton G1652 polymer, it still retains the high tensile strength and toughness of Kraton G1652 while offering significantly lower melt and solution viscosities. Kraton G1653 is suitable for food contact and medical applications.

New Developmental Polymer


Features and benefits

  • It has low solution viscosity. This low solution viscosity increases solid content and decreases VOC of solvent based products, yet maintains similar processability. For sealant applications, the increased solid content is expected to reduce shrinkage and costs associated with solvent. For coating applications, the increased solid level translates to potentially reduced coating layers and lower labor cost.
  • Kraton G1653 also can be dissolved in PCBTF at 20 percent solids, which may enable formulators to replace organic solvents with PCBTF to reduce VOCs associated with the final product.
  • The free flowing dense pellet form of Kraton G1653 is expected to improve storage, handling, and feeding of the polymer in comparison to SEBS polymers in powder form. 

Properties of Kraton G1653:

  • Does not block together during storage
  • Can be transferred using conventional pneumatic conveying equipment
  • Does not agglomerate when dissolving in solvents
  • The dense pellet form may enable improved production rates
  • Potential Market Applications:
  • Sealants
  • Pressure sensitive adhesives
  • Hot melt adhesives
  • TPE compound
  • Coating applications
  • Elastic compound
  • Medical compound
  • Color master batch
  • Additive concentrates
  • Oil gel
  • Polymer modification

Prakash Kolluri, Vice President Sales & Marketing Asia Pacific noted, "Kraton G1653 is another new Kratoninnovation polymer that was developed to meet the market trend toward lower viscosity, high flow, and lower processing temperature. We expect that Kraton G1653 will allow our customers to meet the tight VOC regulatory requirements without sacrificing performance and processability."

Kraton G1653 - Kraton MD1653

The product Kraton G1653 will be offered under the name Kraton MD1653 until fully commercialized.

Kraton G1653 offers significantly higher melt flow and lower solution viscosity than its conventional SEBS analogue. This allows formulators to develop high flow compounds with excellent properties without adding excessive oils. Compounds based on Kraton G1653 can also be extruded or molded at lower temperatures. For hot melt adhesives, the lower melt viscosity translates to lower processing temperatures, which is expected to reduce energy consumption and improve production rates.

Kraton G1653 has the same low rubber phase Tg (-48.5°C) as the conventional G1600 series polymers. This rubber Tg allows the polymer to remain flexible and elastic at low temperatures. G1653 can also be compounded with random copolypropylene and extruded into clear films with superior toughness for medical applications. Such films can be heat sealed and sterilized. It can also be used as an impact modifier for rigid polymers or as an interfacial compatibilizer for polymer alloys or blends.

Packaging and availability information

Kraton G1653 is produced at Kraton's Belpre plant. It is available immediately in commercial quantities. Please contact your Kraton representative or distributors for samples.

About Kraton Polymers

Kraton Performance Polymers, Inc. is one of the leading global producers of styrenic block copolymers, specialty polymers and high-value performance products derived from pine wood pulping co-products.Kraton's polymers are used in a wide range of applications, including adhesives, coatings, consumer and personal care products, sealants and lubricants, and medical, packaging, automotive, paving, roofing and footwear products. As the largest global provider in the pine chemicals industry, the company's pine-based specialty products are sold into adhesive, road and construction and tire markets, and it produces and sells a broad range of chemical intermediates into markets that include fuel additives, oilfield chemicals, coatings, metalworking fluids and lubricants, inks, flavors and fragrances and mining. Kraton offers its products to a diverse customer base in over 70 countries worldwide.

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Source: Kraton
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