Overview
Bis(2-(methacryloyloxy)ethyl) phosphate (CAS 32435-46-4 ) is a bifunctional phosphate monomer combining a reactive methacrylate group with a pendant phosphate moiety. It is recognized in procurement as bis(methacryloyloxyethyl) hydrogen phosphate.
The phosphate functionality delivers flame retardancy and surface adhesion promotion directly within a polymerizable matrix. This eliminates the need for separate additive packages in many industrial formulations.
In UV- and thermally-cured coatings, it acts as a reactive flame-retardant monomer that becomes chemically bound into the polymer network. This prevents plasticizer-style migration losses over time in the finished product.
Adhesive and sealant formulators use it to improve bonding to metal and mineral substrates. The phosphate group coordinates with surface oxides to enhance adhesion without the requirement of a separate primer layer.
In printing inks and packaging coatings, it supports substrate wetting and anchorage on difficult surfaces. This is particularly effective for applications involving aluminum foil and various treated films.
Polymer compounders incorporate it as a co-monomer to introduce inherent flame retardancy into acrylic systems. These materials are frequently targeted at demanding electronics and construction applications.
The product is supplied as a liquid, typically with an inhibitor added to prevent premature polymerization during storage. Technical grade is the standard commercial offering for most industrial users.
Purity specifications are commonly confirmed by acid value and phosphorus content assays. Packaging ranges from small quantities for R&D sampling to bulk drum supply for large-scale industrial formulation.
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Physical Properties
| Boiling Point | 221 °C(lit.) |
| Density | 1.28 g/mL at 25 °C(lit.) |
| Flash Point | >230 °F |
| Refractive Index | n 20/D 1.47(lit.) |
Safety & Handling
Warning GHS07 Hazard Statements H315 Causes skin irritation H319 Causes serious eye irritation H335 May cause respiratory irritation H412 Harmful to aquatic life with long lasting effects Precautionary Statements P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29199000 |
| Storage Class | 10 - Combustible liquids |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 32435-46-4
- EC Number
- 251-040-2
- Mol. Weight
- 322.25
- HS Code
- 29199000
- Category
- Polymers & Resins