Name: Maleic Anhydride-Modified Rosin MAR-80
Brand: Coatingsink
SKU: maleic-anhydride-modified-rosin-mar80
Availability: InStock

Question 1

How is maleic anhydride modification beneficial for rosin in ink applications?

Accepted Answer

Maleic anhydride reacts with natural rosin via a Diels-Alder or ene reaction to form maleic-modified rosin (adduct). This increases the softening point, reduces crystallization tendency, improves compatibility with alkyd resins and solvents, and raises the acid value — beneficial for preparing water-dilutable or alkali-soluble varnishes for gravure and overprint ink applications.

Question 2

Can MAR-80 be dissolved in water or water-ammonia systems?

Accepted Answer

Yes. The high acid value (200–220 mgKOH/g) of MAR-80 enables solubility in dilute ammonia or amine solutions (pH 8–9), making it suitable for water-based overprint varnish and packaging ink formulations. Dissolving in hot isopropyl alcohol first, then diluting with ammonia water, is the recommended procedure for clear water-reducible solutions.

Ash	≤0.1%
Acid Value	200–220 mgKOH/g
Maleic Content	12–15%
Softening Point (R&B)	115–125°C
Color (Hazen, 50% in methanol)	≤100

Maleic Anhydride-Modified Rosin MAR-80

Specifications

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