Name: Saturated Polyester Resin SP-3025
Brand: Coatingsink
SKU: saturated-polyester-resin-sp3025
Availability: InStock

Question 1

What crosslinkers are used with saturated polyester resins in powder coatings?

Accepted Answer

SP-3025 with hydroxyl functionality is crosslinked with TGIC (triglycidyl isocyanurate) or HAA (hydroxyalkylamide) in epoxy-polyester hybrid powder coatings. For solvent-borne baking systems, hexamethoxymethyl melamine (HMMM) or blocked polyisocyanates are used. The choice depends on the required cure schedule and performance profile.

Question 2

Why is Tg important for powder coating polyester resins?

Accepted Answer

Tg of 55–65°C for the uncured solid resin ensures good storage stability (no sintering at ambient conditions) and proper melt flow during extrusion compounding. After curing, the network Tg typically rises to 80–110°C, providing hardness and chemical resistance. Low Tg powders (below 50°C) risk blocking in storage; high Tg powders may under-flow and give rough surfaces.

Tg	55–65°C
Acid Value	≤5 mgKOH/g
Hydroxyl Value	25–35 mgKOH/g
Softening Point	95–105°C
Melt Viscosity (160°C)	1500–3000 mPa·s

Saturated Polyester Resin SP-3025

Specifications

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