In-depth Analysis of Easmer EOBPADA

Ethoxylated Bisphenol A Diacrylate (EOBPADA, CAS#64401-02-1) is a key difunctional acrylate monomer. Thanks to its outstanding integrated performance, it plays an indispensable role in UV (ultraviolet) curing systems. This report aims to systematically analyze its structural properties, performance features, application areas, and key specification differences, offering in-depth reference for R&D, production, and investment decisions in related fields.

Molecular Structure and Properties

Molecular Architecture

EOBPADA’s general molecular structure consists of a rigid central core, two flexible chains, and two reactive end groups. This “rigid-flexible balance” design is the basis of its multifunctionality.

General structure of EOBPADA, with the sum of X + Y representing the number of ethylene oxide (EO) repeating units.

Core Backbone – Bisphenol A (BPA) Group: The rigid "spine" of the molecule. The two benzene rings in the BPA structure provide excellent rigidity, high hardness, and heat resistance. After curing, it forms a polymer network with high glass transition temperature (Tg) and crosslink density, directly contributing to the coating’s scratch resistance, chemical durability, and gloss.

Flexible Segments – Ethoxylated (EO) Chains: The “flexible arms” connecting the rigid core to the reactive ends. The poly(ethylene oxide) chain (-CH₂CH₂O-)n adds key tunability. The EO chain’s flexibility improves the toughness and impact resistance of the cured film by absorbing and dispersing stress. More importantly, EO chains disrupt molecular rigidity and symmetry, increasing free volume between molecular chains, significantly reducing monomer viscosity and improving formulation flow and processability.

Comprehensive Impact of Structure on Core Properties

Hardness vs. Toughness Balance: The BPA backbone provides hardness, while EO chains contribute toughness. By adjusting EO chain length (degree of ethoxylation), one can balance high hardness/scratch resistance with flexibility/impact resistance to suit various applications.

Viscosity and Dilution Capability: Unmodified BPA-type epoxy acrylates are highly viscous and hard to handle. Introducing EO chains in EOBPADA reduces viscosity, allowing it to serve as both a base resin and reactive diluent in formulations, reducing or eliminating the need for volatile organic compounds (VOCs).

Curing Speed and Shrinkage: Highly reactive acrylate groups ensure fast curing. Meanwhile, flexible EO chains buffer volume shrinkage during polymerization—critical for high-precision applications like 3D printing and dental restorations.

Skin Irritation and Safety: Compared to small-molecule acrylates, ethoxylation increases molecular weight and flexibility, generally reducing skin irritation and improving handling safety.

Product Specifications

Easmer EOBPADA is not a single specification product; its performance is differentiated by the degree of EO addition (chain length). Currently available specifications include 2EO, 4EO, and 10EO versions, showing consistent trends in physical and application properties. Understanding these differences is crucial for formulation and material selection.

Application Fields

Due to its tunable properties and excellent overall performance, EOBPADA is widely used in many high-tech sectors as a key material for solving engineering challenges.

UV-Curable Coatings, Inks, and Varnishes

This is EOBPADA’s most traditional and extensive application, seen in wood furniture, automotive interiors, consumer electronics casings, and print overcoats.

Key Value: BPA’s high refractive index contributes gloss and fullness. Strong crosslinking delivers abrasion, scratch, and chemical resistance. As a 100% solids reactive monomer, it meets stringent global VOC regulations. By selecting or blending different EO-chain EOBPADA grades, formulators can tailor coating properties to various substrates (rigid plastics, flexible films) and environments.

Photocurable 3D Printing Resins (SLA/DLP)

In additive manufacturing, especially SLA, DLP, and LCD technologies, EOBPADA is a critical component in high-performance resins.

Key Value: Conventional acrylate resins face a “hard but brittle” vs. “tough but soft” dilemma. EOBPADA—particularly 4EO and 10EO versions—balances rigidity and toughness. Longer EO chains reduce polymerization shrinkage, improving dimensional accuracy and reducing warping. BPA's rigidity ensures post-cure dimensional stability and feature fidelity. Used in functional prototypes, durable parts, and dental molds.

Dental Restorative Materials

In biomedical applications, especially dentistry, EOBPADA is used in composite resins (for fillings), sealants, and adhesives due to its excellent performance and biocompatibility.

Key Value: Dental materials demand high mechanical strength (for chewing forces), low shrinkage (to prevent microleakage), biocompatibility, and color stability. EOBPADA (and its methacrylate analog Bis-EMA) meets these needs well. As a crosslinker, it forms durable polymer networks. Ethoxylation improves handling and safety, making it a potential Bis-GMA substitute for reduced viscosity and better performance.

Other High-Tech Material Fields

EOBPADA’s potential is expanding into more frontier areas:

Gel Electrolytes: In lithium-ion batteries and other energy storage devices, EOBPADA acts as a crosslinker in solid/semi-solid gel electrolytes. BPA structure enhances thermal/mechanical stability, while EO chains facilitate lithium-ion transport.

Electronic Encapsulation and Coatings: With good insulation, heat resistance, and low shrinkage, EOBPADA is used in conformal coatings and encapsulants for microelectronic components, offering chemical and physical protection.

Flexible Packaging Nanocoatings: As a precursor in nanocoatings for flexible films, EOBPADA provides barrier properties (e.g., oxygen/water resistance) and flexibility.

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