Name: SIS Block Copolymer for PSA and Hot-Melt SIS-1307
Brand: Coatingsink
SKU: sis-block-copolymer-adhesive
Availability: InStock

Question 1

How does styrene content in SIS affect PSA performance?

Accepted Answer

Styrene content controls the hard-domain volume fraction and thus cohesive strength. At 14–16% styrene (SIS-1307 grade), the polymer delivers high tack and aggressive peel on low-energy surfaces such as PE and PP films, making it ideal for packaging labels and tapes. Increasing styrene to 20–22% raises cohesive strength and reduces creep but lowers initial tack; lower styrene grades (<12%) are used in stretchable or elastic adhesive constructions.

Question 2

What is the role of diblock content in SIS-based pressure-sensitive adhesives?

Accepted Answer

The diblock (SI) fraction acts as a plasticizer within the SIS network, improving wettability and quick-stick on rough or low-energy substrates. SIS-1307 contains 15–20% diblock, which balances peel adhesion and shear resistance. Higher diblock fractions (>30%) increase aggressive tack but reduce shear hold time; select grades accordingly based on loop tack vs. SAFT (shear adhesion failure temperature) requirements.

Question 3

Which tackifier resin systems are compatible with SIS-1307?

Accepted Answer

SIS is compatible with aliphatic C5 hydrocarbon resins (Tg ~40–80°C) and aromatic-modified C9/C5 resins that selectively associate with the isoprene mid-block. Pure C9 aromatic resins are incompatible with the PI mid-block and primarily reinforce the polystyrene domains, raising modulus without improving tack. For hot-melt PSA, a blend of 80–120 phr C5 resin plus 20–40 phr naphthenic oil is a typical starting formulation.

Diblock Content	15–20%
Styrene Content	14–16%
Elongation at Break	>1,200%
Tensile Strength (pure polymer)	≥25 MPa
Solution Viscosity (25°C, 25% in toluene)	1,000–1,600 mPa·s

SIS Block Copolymer for PSA and Hot-Melt SIS-1307

Specifications

FAQ

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