Name: C5/C9 Hydrocarbon Resin Blend (50:50)
Brand: Coatingsink
SKU: c5-c9-hydrocarbon-resin-blend
Availability: InStock

Question 1

What does a C5/C9 blend offer compared to pure C5 or pure C9 hydrocarbon resins?

Accepted Answer

Pure C5 aliphatic resins have good mineral oil compatibility, light color, and low cost but limited hardness. Pure C9 aromatic resins offer higher tack, better adhesion, and higher gloss but darker color and lower compatibility with aliphatic oils. A 50:50 C5/C9 blend strikes a practical balance: moderate tack and hardness from the C9 component, good oil compatibility and lighter color from the C5 fraction. This makes blends the most versatile ink vehicle resin for heatset offset applications.

Question 2

How does softening point affect ink performance in heatset web offset printing?

Accepted Answer

In heatset offset, the ink must set rapidly in an oven dryer at 120–180°C as the web passes through. A resin with a softening point of 100–110°C melts into the mineral oil vehicle under press temperature, then resolidifies and bonds to the paper as the oil is absorbed or evaporated during drying. Lower softening point resins set too slowly; higher softening point resins resist dissolution in the ink vehicle at mixing temperature. The 100–110°C range is optimized for standard heatset press conditions.

Acid Value	≤1 mgKOH/g
Bromine Number	<5 g Br/100g
Specific Gravity	0.97–1.01 (100% resin)
Softening Point (R&B)	100–110°C
Color (Hazen, 50% toluene)	≤100

C5/C9 Hydrocarbon Resin Blend (50:50)

Specifications

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