ROSIN ESTER PENTAERYTHRITOL

What is Pentaerythritol Ester of Gum Rosin?

Pentaerythritol-modified rosin commonly known as Pentaerythritol Ester of Rosin or Pentaerythritol Rosin Ester is a resin produced by esterifying rosin with pentaerythritol.

Pentaerythritol is a polyol containing four hydroxyl (-OH) groups. When it reacts with the resin acids present in rosin, it forms esters with larger and more stable molecular structures than the original rosin.

The purpose of this modification is to reduce the acidity of rosin while improving thermal resistance, stability, adhesion and compatibility with polymers.

Properties of Pentaerythritol Ester of Gum Rosin

Property	Characteristics
Adhesion	Good, particularly suitable for adhesive systems requiring high tack
Softening point	Generally higher than that of glycerol ester and unmodified rosin
Thermal resistance	Better than unesterified rosin
Acid value	Significantly lower than that of unmodified rosin
Oxidative stability	Improved, especially in hydrogenated or disproportionated rosin grades
Compatibility	Compatible with various rubbers and polymers such as EVA, SIS, SBS, NR, and certain polyolefins
Tackifying ability	Good, making it widely used as a tackifier
Color	Ranges from light yellow to amber depending on the raw materials and manufacturing process
Odor	Generally milder than unmodified rosin, depending on the product grade
Solubility	Soluble in many organic solvents; insoluble in water

Compared with Glycerol Rosin Ester, Pentaerythritol Rosin Ester generally has a higher softening point and better heat resistance make it more suitable for hot-melt adhesive formulations operating at elevated temperatures.

Applications of Pentaerythritol Ester of Gum Rosin

Its most important application is as a tackifying resin in the adhesive industry.

• Hot Melt Adhesives Used with EVA, SIS, SBS and other base polymers to increase tack and adhesion and to adjust the softening temperature.
• Pressure-Sensitive Adhesives Used in adhesive tapes, labels, decals and protective films.
• Packaging Adhesives Used for carton sealing, box bonding, bookbinding and food packaging when the resin grade complies with the relevant standards.
• Footwear Adhesives Used in certain rubber-based and hot-melt adhesive formulations.
• Rubber Compounds Used as a tackifier or property-modifying agent in certain rubber formulations.
• Paints and Coatings Certain rosin ester grades are used to improve adhesion, gloss and film-forming properties.
• Printing Inks May be used in certain ink systems as a binder or as a modifier for adhesion and gloss.
• Waxes and Coating Materials Used to adjust hardness, adhesion and softening temperature.

Technical Specifications

PRODUCT NAME	PRODUCT CODE	COLOR (GARDNER, 50% TOLUENE)	ACID VALUE (mg KOH/g)	SOFTENING POINT (°C, R&B)	COLOR STABILITY AT 180°C/8H (ΔE GARDNER)
PENTAERYTHRITOL ESTER OF ROSIN	PER100A	3–4	≤20	100 ± 3	<2
PENTAERYTHRITOL ESTER OF ROSIN	PER100B	4–5	≤20	100 ± 3	<2