Page 40 - Plastics News September 2021

PRoDUCT NEwS

Low/Middle molecular weight Hydrogenated Styrenic Block Copolymer

Bear Wang (Marketing Supervisor, LCY GRIT Corp.)

percentage at 13%, and with 30%
diblock content, making it softer
and more elastic than conventional
HSBC grades. GP-9557D is a
high-flow polymer for adhesives,
coatings, sealants, film and polymer
impact modification.
• GP-9526D has a much higher
diblock content (70%) and provides
excellent flow in adhesive, sealant
and coating applications. It also
has better adhesive performance,
especially excellent wetting property.
It can be used for hygiene diaper
applications that require high speed
production at lower processing
temperatures.
Introduction LCY’s specialty HSBC grades have good
Hydrogenated Styrenic Block compatibility with additives. They are • GP-8501U is a 100% pure diblock
Copolymers (HSBC) provide excellent easily combined with other materials and SEP structure designed to provide
weather resistance and lower odor risks can be used in many applications. cohesion performance, special
compared to unsaturated SBS or SIS. • GP-9552 is a low molecular weight thixotropic characteristics to
Since HSBCs have good resistance to linear triblock polymer with an increase sag resistance and enhance
degradation under UV light exposure, intermediate level of styrene content. shear-thinning function to many
they have good color stability and can This provides balanced mechanical products such as fiber optical
withstand exposure to harsh outdoor properties, good compatibility with cable filling compounds, cosmetic
environments. PO, PP, PE, EVA and is often used thickeners, sealants, coatings and
energy damping.
HSBC are suitable for plastics in hygiene applications. It is also
modification for consumer and industrial widely used in coating and sealant • GP-9901 is a maleic anhydride
applications. Not only can they be used applications due to its high strength. grafted SEBS with increased polarity
in plastics modification, but they are • GP-9557D has a lower styrene for over-molding compounds and
also widely used in adhesives. These impact modifiers. The effective
block copolymers have good physical Polymer 9552 9557D 9526D 8501U 9901
properties and are compatible with HSBC type SEBS SEBS SEBS SEP SEBS-g-MAH
additives such as tackifiers and processing PSC (%) 30 13 30 37 30
oils. Diblock content (%) <1 30 70 100 <1
MFI in g/10min 5 20 >100 <2 >10
o
at 230 C,5kg
20% TSV at 25 C 440 1500 <100 2500 2000
o
15% TSV at 25 C -- -- -- 950 --
o
Tensile Strength (MPa)* 28 17 4 2 14.5
Elongation (%)* 500 700 300 <100 600
Hardness (Shore A) 77 50 70 64 75
Product form Powder Dense pellet Dense pellet Powder Dense pellet
*Mechanical properties marked * are measured by hot-pressed plastic sheet.

40 PLASTICS NEWS SEPTEMBER 2021 41 PLASTICS NEWS SEPTEMBER 2021