4-Hydroxybutylacrylat - 4-Hydroxybutylacrylat
|other names|| |
|Sum formula||C 7 H 12 O 3|
|Brief description|| |
colorless and odorless liquid 
|External identifiers / databases|
|Molar mass||144.2 g · mol −1|
|Physical state|| |
|boiling point|| |
|Refractive index|| |
1,452 (20 °C)
|As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C|
In 4-hydroxybutyl acrylate (4-HBA, 1,4-butanediol monoacrylate) is an ester of acrylic acid . It contains both a hydroxyl group and an unsaturated double bond . It is generally used as a monomer for different classes of binders . 
Extraction and presentation
When reacting with isocyanates , hydroxybutyl acrylate has the highest reactivity of the common hydroxyl group-containing acrylate monomers. This is based on the one hand on the electron-donating effect of the hydrocarbon chains and on the other hand on the better availability for the reaction. This means that a hydroxyl group on a long hydrocarbon chain has a much better mobility and can thus meet an isocyanate group more easily. It is more reactive than 2-hydroxypropyl acrylate and 2-hydroxyethyl acrylate . 
Hydroxybutyl acrylate can be incorporated into binders such as polyacrylates via free-radical or ionic polymerization . Since hydroxybutyl acrylate has a free hydroxyl group, it can be used to incorporate hydroxyl groups into resins. These groups are then available for curing reactions with isocyanates or urea resins . 
- Data sheet 4-Hydroxybutyl acrylate from Sigma-Aldrich , accessed on June 14, 2018 ( PDF ).
- Roland Baumstark, Reinhold Schwalm and Manfred Schwartz: Acrylate resins . Vincentz Network, Hannover 2014, ISBN 978-3-86630-820-6 .
- Ulrich Poth: Synthetic binders for coating systems . Vincentz Network, Hannover 2016, ISBN 978-3-86630-611-0 .