Name: Tall Oil Rosin Adhesive Grade TOR-WW
Brand: Coatingsink
SKU: tall-oil-rosin-adhesive
Availability: InStock

Question 1

What distinguishes WW-grade from WG-grade tall oil rosin for adhesive applications?

Accepted Answer

WW (water white) grade has a Gardner color ≤1 and unsaponifiable content ≤6%, making it suitable for light-colored adhesives and higher-purity ester gum synthesis. WG (window glass) grade carries Gardner color ≤2 and is acceptable in many rubber contact adhesive formulations where slight color is tolerable. WW grade also offers better oxidative stability, important for long-shelf-life hot-melt adhesives.

Question 2

Can TOR-WW be used directly as a tackifier in solvent-based contact adhesives without esterification?

Accepted Answer

Yes. TOR-WW dissolves readily in aromatic solvents (toluene, xylene) and aliphatic/ester blends, and is used directly at 20–40 phr in SBR- or neoprene-based contact adhesives. Its acid value of 165–175 mg KOH/g provides good initial tack and peel adhesion. For improved heat resistance and reduced crystallization tendency, esterification with glycerol or pentaerythritol is recommended.

Question 3

What is the standard esterification procedure for producing glycerol ester of rosin from TOR-WW?

Accepted Answer

Esterification is conducted at 260–280°C under a nitrogen blanket with a rosin-to-glycerol molar ratio of approximately 3:1. The reaction is considered complete when the acid value of the product drops below 15 mg KOH/g, typically after 4–8 hours. A small amount of zinc acetate (0.05–0.1% on rosin weight) is commonly used as catalyst to accelerate the reaction without significant color contribution.

Acid Value	165–175 mg KOH/g
Ash Content	≤ 0.03%
Color (Gardner)	≤ 1 (WW grade)
Softening Point (R&B)	72–80°C
Unsaponifiable Matter	≤ 6%

Tall Oil Rosin Adhesive Grade TOR-WW

Specifications

FAQ

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