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KURARITY™ – The transparent TPE

KURARITY™ is a series of acrylic block copolymers that are produced using Kuraray’s unique anionic living polymerization technology, which combines various (meth)acrylates into A-B or A-B-A type block copolymers. This controlled polymerization process enables KURARITY™ to remain exceptionally transparent and clean with minimal residual monomer or oligomer compared to conventional acrylic polymers that are produced using radical polymerization. KURARITY™ is also referred to as MAM (Methyl-methacrylate-Acrylate-Methyl-methacrylate), it consists of methyl methacrylate hard-blocks (PMMA-blocks) and an acrylic based soft-block (a PnBA-block or a P(nBA/2EHA)-block).

Due to its structure, KURARITY™ exhibits a variety of properties such as excellent transparency, weather resistance, self-adhesion and good compatibility with other polar materials. The acrylic-based block copolymer can be processed into a wide variety of applications, such as adhesives, coatings and sealants, 3D printing or light guides (especially in the mobility sector and home appliances). KURARITY™ can be used as an additive to modify polar plastics and is ready to use for injection and extrusion applications.

KURARITY™ in its pellet form


  • Self-adhesive
  • Functional group / acid-free
  • Excellent transparency
  • Extremely low residual monomers or oligomers
  • Less odor
  • Excellent weatherability
  • No hydrolysis degradation
  • High-gloss, comparable with PMMA
  • Excellent flexibility, without plasticizers
  • Excellent injection / extrusion moldability
  • Good compatibility with polar plastics
Plastic modification with KURARITY™


  • Alternative to TPU
  • High tack (without tackifier or plasticizer)
  • Low hardness without plasticizer
  • Residual-free adhesives
  • No yellowing
  • High adhesion to polar resin
KURARITY™ can be used as light guides.


  • Adhesives, coatings, sealants
  • Compounding
  • Polymer modification
  • Consumer goods
  • Mobility
  • Sporting goods & footwear
  • 3D printing

Grades of KURARITY™

Kuraray developed two families of KURARITY™ called LA-series and LK-series. LA-series utilizes a poly (n-butyl acrylate) mid-block while the LK-series utilizes a poly (n-butyl acrylate/2-ethylhexyl acrylate) mid-block. The grades are differentiated by low PMMA content to high PMMA content, from low molecular weight to high molecular weight and by their applications.

All grades of KURARITY™ show similar low temperature properties which result from Tg of poly (n-butyl acrylate) mid-block or poly (n-butyl acrylate/2-ethylhexyl acrylate) mid-block and heat resistance from Tg of PMMA.

When used as a modifier for various types of polar resins (PC, ABS, PBT, PC/ABS, PMMA, PVC, PLA), inks, coatings, adhesives and other compounds, KURARITY™ imparts special properties such as improved flow-ability, impact resistance, softness and polarity. This effect is different compared to general core-shell type impact modifiers.

LA-series has an n-butyl acrylate-based soft block.
LK-series has an n-butyl acrylate/2-ethylhexyl acrylate-based soft block.

Product Brochure

KURARITY™ – acrylic block copolymer

Technical insights

You can find more information about our products and applications in the R&D documentation.