Name: Alpha-Pinene Terpene Resin Tackifier APT-90
Brand: Coatingsink
SKU: alpha-pinene-terpene-tackifier
Availability: InStock

Question 1

How does alpha-pinene terpene resin compare to beta-pinene resin in pressure-sensitive adhesive performance?

Accepted Answer

Alpha-pinene resins generally exhibit a higher glass transition temperature (Tg) at equivalent softening point and a narrower molecular weight distribution compared to beta-pinene resins. APT-90 offers faster tack build and superior compatibility with EVA-based hot-melts. Beta-pinene resins typically deliver higher 180° peel strength in SIS/SBS systems. Selection depends on the elastomer base and the target balance between tack, peel, and shear resistance.

Question 2

What loading level of APT-90 is recommended in SIS-based pressure-sensitive adhesives?

Accepted Answer

Typical loading is 80–120 phr with linear SIS (30–35% styrene content). At 100 phr, APT-90 delivers approximately 12–18 N/25 mm 180° peel on stainless steel (PSTC-101) and good loop tack. Loadings above 130 phr increase quick-stick but reduce shear holding power; adjust based on the block copolymer's styrene content and whether a radial or linear architecture is used.

Question 3

Is APT-90 compatible with EVA hot-melt adhesives used in packaging and bookbinding?

Accepted Answer

Yes. APT-90 is fully compatible with EVA copolymers in the 18–40% vinyl acetate range and is used at 50–150 phr in case-sealing, tray-forming, and bookbinding hot-melt formulations. Its near-zero acid value (≤1 mg KOH/g) avoids interference with moisture-cure PUR systems, and its light Gardner color (≤2 in 50% toluene solution) preserves aesthetics in light-colored or clear adhesive products.

Acid Value	≤ 1 mg KOH/g
Ash Content	≤ 0.1%
Softening Point (R&B)	88–92°C
Color (Gardner, 50% toluene)	≤ 2
Viscosity (50% toluene, 25°C)	60–120 mPa·s

Alpha-Pinene Terpene Resin Tackifier APT-90

Specifications

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