Description

Rosin, Polymd. CAS NO 65997-05-9 is a chemically modified resin derived from natural rosin through a polymerization process, resulting in a product with enhanced thermal stability and resistance to oxidation. This modification is critical for applications requiring durable, long-lasting performance under demanding conditions. It serves as a vital raw material for manufacturers in the adhesives, printing inks, coatings, and rubber industries seeking to improve product longevity and performance.

Application

• Hot-Melt Adhesives (HMAs): A key tackifier and modifier, providing excellent adhesion, thermal stability, and cohesive strength for packaging, woodworking, and product assembly.
• Pressure-Sensitive Adhesives (PSAs): Enhances tack, peel, and shear resistance in tapes, labels, and graphic films.
• Printing Inks: Used as a resinous vehicle to improve gloss, rub resistance, and drying properties in gravure and flexographic inks.
• Industrial Coatings: Acts as a modifying resin to enhance film hardness, water resistance, and adhesion to various substrates.
• Rubber Compounding: Functions as a processing aid and tackifier, improving the compound's workability and the final product's grip and resilience.
• Solder Flux: Serves as a core component in rosin-based fluxes, promoting solder wetting and flow while leaving a protective film.
• Sealants and Caulks: Imparts flexibility, adhesion, and durability to formulations used in construction and automotive applications.

Basic Information

Product Name	Rosin, Polymd.
CAS No.	65997-05-9
Molecular Formula	Complex mixture; primarily based on polymerized abietic-type resin acids (C20H30O2)n
Molecular Weight	Variable (Polymer)
Synonyms	Polymerized Rosin; Rosin Polymer; Dimerized Rosin; Stabilized Rosin; Hydrogenated Rosin Polymer; Disproportionated Rosin; Modified Gum Rosin; Ester Gum (related); Rosin Ester (related); Colophony Polymer
EINECS	266-042-9

Quality Control

Our Polymerized Rosin is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure consistent performance, including assessments of acid value, softening point, color, and oxidative stability. Certificates of Analysis (COA) documenting these specifications are available for every shipment. We adhere to relevant industrial standards and can support compliance requirements for specific applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C / 59-77°F). This product is easily oxidized; prolonged storage under an inert atmosphere (e.g., nitrogen) is recommended for optimal long-term stability. Keep away from strong oxidizing agents and heat sources.

Specification

Item	Specification
Appearance	Pale yellow to amber solid
Acid Value (mg KOH/g)	150 - 170
Softening Point (Ring & Ball, °C)	75 - 95
Color (Gardner)	≤ 8
Saponification Value	155 - 175
Ash Content	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.