Introduction to the Characteristics and Uses of Polymerized Rosin Jun 20, 2024

① Name and Properties

  • English Name: Polymerized Rosin
  • Alternative English Names: Rosin, Polymerised
  • CAS Number: 65997-05-9
  • Physical Properties: Yellow-brown amorphous solid. Polymerized rosin is primarily composed of dimers, along with a mixture of rosin and rosin hydrocarbons. It is characterized by light color, high softening point, non-crystallinity, high acid value, low hot water-soluble content, good oil solubility, and light lead acetate discoloration. Dimers account for 20% to 50% and are relatively stable, resisting oxidation. It is soluble in organic solvents such as toluene, gasoline, petroleum ether, chloroform, and dichloroethane.

Target Values (Spec Limits)


PR 90 PR 115 PR 140 


Yellow Transparent Solid 

Color Gardner




Softening Point (R&B)°C

88-93 110-120 135-145

Acid Value, mgKOH/g

≤165 ≥145 ≥140

Density (20°C, abt., g/cm³)

1.08-1.1 1.08-1.1 1.08-1.1

② Chemical Formula or Molecular Formula and Structural Formula

  • Molecular Formula: C40H60O4 (Note: This is a simplified or representative molecular formula, as polymerized rosin is a mixture, so the specific structure may vary depending on the degree of polymerization.)

③ Physical and Chemical Properties and Quality Indicators

  • Softening Point: 90 to 120°C (This is the temperature range at which polymerized rosin begins to flow when heated.)
  • Acid Value: 150 mg KOH/g (This is a measure of the acidic component content in polymerized rosin, typically expressed as the milligrams of potassium hydroxide required to neutralize 1 gram of the sample.)
  • Other Quality Indicators: See the provided table.

④ Main Applications

  • As a Tackifying Resin: Used in hot-melt, pressure-sensitive, and solvent-based adhesives to enhance adhesion and provide reinforcement effects.
  • Improving Bonding Strength: Enhances the heat sensitivity of adhesive tapes and improves bonding strength.
  • Reducing Product Costs: Can partially replace other costlier resins, such as terpene resin and petroleum resin.
  • EVA Hot-Melt Adhesive: Provides optimal comprehensive performance when used in EVA hot-melt adhesives. The usage amount is typically optimized based on specific applications and desired properties, but 50% usage is often recommended, or 120 parts by mass for maximum peel strength.

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