Name: Rosin-Modified Phenolic Resin RMPF-130
Brand: Coatingsink
SKU: rosin-modified-phenolic-rmpf130
Availability: InStock

Question 1

Why are rosin-modified phenolic resins preferred in offset printing inks?

Accepted Answer

RMPF resins provide the ideal combination of fast ink setting (due to high Tg and compatibility with mineral oil separation in paper), tack development, and gloss for sheet-fed and heatset web offset inks. Their compatibility with linseed oil varnish and mineral oils makes them the cornerstone binder for conventional lithographic ink systems.

Question 2

How is RMPF-130 distinguished from petroleum hydrocarbon resins in inks?

Accepted Answer

RMPF-130 is derived from natural rosin (colophony) modified with formaldehyde-condensed phenols, then esterified with polyols (glycerol, pentaerythritol). It offers better oil compatibility and higher acid value than pure hydrocarbon resins. Hydrocarbon resins are cheaper but may lack the rheological and tack profile needed for high-quality offset inks.

Ash	≤0.1%
Acid Value	≤20 mgKOH/g
Solubility	toluene, xylene, linseed oil
Softening Point (R&B)	135–145°C
Color (50% in toluene, Gardner)	≤8

Rosin-Modified Phenolic Resin RMPF-130

Specifications

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