1) 3-arm Branched PEG (SUNBRIGHT® GL3 Series)

3-arm activated branched PEGs, to which another PEG spacer is introduced to 2-arm activated branched PEGs,
show a higher reactivity with pharmaceutical substances. Patent No.:US8828373

2) 4-arm Branched PEG (SUNBRIGHT® GL4 Series)

4-arm activated branched PEGs can reduce the viscosity of the relevant aqueous solutions, by introducing a larger number of branching points even without altering the molecular weight. Patent No. : JP5515224, US8071712

Comparison Data of PEG-Solution Viscosity