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Hayakawa Rubber Co., Ltd.

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Hayabeads

Hayabeads

“Hayabeads” functional particles are used as cell gap spacers for LCD panels by a number of LCD manufacturers within Japan and overseas. Their use however is not limited to only LCD panels, they are being deployed in an ever-growing range of applications including various sensors which require detailed thickness control, touch panels, conductive spacer base materials, and more.

■Suspension polymerization high precision classification products

Monodispersed particles which are given a sharp particle size distribution through wet-classification of particles produced through suspension polymerization.

Classification nearly completely removes large and fine particles which greatly differ from the average particle size.

  • Can be produced as uniform particles with an extremely sharp particle size distribution of Cv. value*2% to 5% at a range of 4 μm to 15 μm.
  • Because they are crosslinked acrylic particles, they possess extremely good heat resistance and almost no change in physical properties due to heat.
  • They also have excellent chemical resistance, making them insoluble in most solvents.
  • Extremely low impurity concentration of 1 ppm or less provides outstanding reliability.
  • Excellent dispersion in water and alcohol resulting in no secondary or tertiary clusters.
  • Extremely high crosslinked density provides the hardest as resin particles, which in turn gives the particles outstanding recovery properties. (L-11)
  • Average particle size can be adjusted in 0.05 μm increments.
  • Has no melting point, and carbonizes at temperatures of 400°C and over.
Material Acrylic resin
Product name LCD cell spacers: Hayabeads L-11
Coloring/surface treatment spacers: Hayabeads L-34
Applications

LCD cell spacers 

Touch panel seal spacers 

Gap material for various precision applications, etc.

■Seed polymerization high precision classification products

Crosslinked particles which are given extremely sharp particle diameter distribution and uniform average particle diameter using seed polymerization technologies. Uniform particles can be produced with a variety of different characteristics by absorbing and polymerizing a variety of monomers with uniform seeds formed in solution.

Our company has made it possible to design and produce particles with higher precision by combining the classification technologies we have cultivated over many years.

  • Can be produced as uniform particles with an extremely sharp particle size distribution of Cv. value 4% or lower at a range of 2 μm to 50 μm.
  • Particles with a variety of strengths, hardnesses, recovery properties, and other physical properties can be design through different combinations of monomers and production methods.
  • Combining with wet classification nearly completely removes large and fine particles.
  • Surface treatments can also be carried out to add color, adhesives, functional groups, and more.
Material Acrylic resin, styrene resin, other
Product name LCD cell spacers: Hayabeads 3DS
Acrylic/styrene crosslinked particles: Hayabeads SD Series
Applications

LCD cell spacers 

Conductive particle base materials 

Gap material for various precision applications, etc.

Hayabeads L-11 characteristics

Properties Unit Measurement value Measurement method Notes
Specific gravity 1.33 JIS K7112C Actual measurement value
Compression strength (6.0 μm) kgf/mm2 106 Shimadzu Corporation microcompression testing machine Actual measurement value
10% modulus of elasticity (6.0 μm) gf/mm2 66 Shimadzu Corporation microcompression testing machine Actual measurement value
Recoverability (6.0 μm 1 g load) % 92 Shimadzu Corporation microcompression testing machine Actual measurement value
Refraction index 1.5 Na-D-ray Reference value
Transparency % 90 1 mm plate Reference value
Critical surface tension dyn/cm2 40 Plate contact angle measurement 1 mm plate Reference value
Coefficient of linear expansion /℃ 5×10-5 15-55℃ 1 mm plate Reference value
Specific resistance Ωcm 3×1015 JIS K6911 1 mm plate Reference value
Surface resistance Ω 1×1015 JIS K6911 1 mm plate Reference value
Dielectric tangent 0.02 JIS K6911(1000Hz) 1 mm plate Reference value
Water content % 1 110℃ × 1hr Actual measurement value

*Because the product is a powder and cannot be measured, a plate was made using the same materials for measurement. For this reason, the values may differ for the actual product, so the values here are provided as reference values only.