Pentaerythritol Ester of Polymerized Rosin
Pentaerythritol Ester of Polymerized Rosin, a hard, amber colored, thermoplastic resin, is the pentaerythritol (PE) ester of partially dimerized rosin. Because of the higher softening point and stabilized nature of the modified rosin from which it is made, It has an appreciably higher softening point and greater resistance to oxidation than PE esters of regular rosin. It is used mainly in varnishes, inks, and adhesives, where its hardness, resistance to aging, solubility, and inherent adhesion are desirable properties.
Key Attributes
Excellent gloss,Excellent pigment wetting,Good solvency,High refractive index,High softening point,Low solution viscosities.
Typical Properties
| Product No. |
Acid (mgKOH/g) |
Softening Point ℃ | Gardner Colour | Solubity(1:1) |
| ASTM-D465 | R+B(ASTM-28) | (50% tol.Gardner 1963) | (with Benzene 1:1) | |
|
WPR 5120 |
≤20 |
110-120℃ |
3-5 |
clear |
|
WPR 5130 |
≤20 |
120-130℃ |
3-5 |
clear |
|
WPR 9130 |
≤10 |
125-135℃ |
9-10 |
clear |
Application/Uses
Asphalt Modification,Assembly,Bookbinding,Caulks and Sealants,Contact Adhesives,Footwear and Leather,Graphic Arts,Hot Melt Adhesives,Laminating,Packaging,Paint and Coatings,Pressure Sensitive Adhesives,Solventborne Adhesives,Tapes and Labels,Wax Modification,Wire and Cable.
Compatibility and Solubility
Compatible with natural rubber, SBR (styrene-butadiene), polychloroprene, drying oils, alkyd resins, shellac, low molecular weight polyethylene, paraffin and microcrystalline waxes. Soluble in aromatic, aliphatic and chlorinated hydrocarbons, esters, ketones, and higher molecular weight alcohols. Insoluble in methanol, ethanol, isopropanol and water.
Packaging
Packaged in aluminum-kraft-bags of 25 kg net, and supplied on shrink-wrapped pallets of 30 bags each.
Storage
Because of the extremely large surface area, flaked forms of resins are prone to gradual oxidation, some more so than others. This could result in darkening and /or could have an adverse effect on solubility in organic solvents. It is strongly recommended that strict control of inventory be observed at all times, taking care that the oldest material is used first. Recommended storage is in original packaging, dry, free from contamination, below 30°C.
Flaked forms of low to medium-softening point resins may fuse, block, or lump:
(1) during hot-weather months,
(2) if stored near steam pipes or other sources of heat, and
(3) upon prolonged storage and compression.