Name: SBS Block Copolymer for Hot-Melt and Contact Adhesives
Brand: Coatingsink
SKU: sbs-block-copolymer-hotmelt
Availability: InStock

Question 1

What is the recommended ratio of SBS to C5/C9 tackifier in a hot-melt formulation?

Accepted Answer

Typical formulations use 20–35% SBS with 30–45% C5 or C9 tackifier resin, balanced with plasticizer (mineral oil or liquid paraffin at 15–30%) and an antioxidant package. The final ratio depends on open time, set speed, and service temperature targets for the specific substrate.

Question 2

How does 30% styrene content affect performance compared to higher-styrene SBS grades?

Accepted Answer

A 30% styrene content delivers an optimal balance of cohesive strength and flexibility. Grades above 35% styrene increase hardness and heat resistance but reduce tack and low-temperature flexibility. 30% styrene is preferred for general-purpose hot-melt and solventborne contact adhesives requiring both peel strength and impact resistance.

Question 3

What antioxidant system prevents degradation during hot-melt processing?

Accepted Answer

A combination of a hindered phenol primary antioxidant (e.g., Irganox 1010 at 0.2–0.5%) and a phosphite secondary antioxidant (e.g., Irgafos 168 at 0.1–0.3%) protects against thermal oxidation during melt processing at 150–180°C. Without stabilization, SBS undergoes chain scission and crosslinking above 160°C, leading to viscosity drift and reduced bond strength.

Styrene Content	30%
Tensile Strength	22 MPa
Elongation at Break	>800%
Mooney Viscosity (ML1+4, 100°C)	50–65
Solution Viscosity (25% in toluene, 25°C)	2500–4000 mPa·s

SBS Block Copolymer for Hot-Melt and Contact Adhesives

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