Irganox 1135 is a sterically hindered phenolic antioxidant specifically designed for use in the stabilization of polyols, polyurethanes, and other polymers. It is a 100% active, liquid product with the chemical name Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-C7-C9 branched alkyl esters and a CAS number of 125643-61-0. It has a molecular weight of 390 g/mol.
The primary application of Irganox 1135 is as an antioxidant in various polymers, including the stabilization of polyurethane flexible slabstock foams. It prevents the formation of peroxides in the polyol during storage, transport, and protects against scorching during foaming.
Features and benefits of Irganox 1135 include its excellent antioxidant performance, convenience as a pumpable liquid, low volatility, and excellent compatibility. These properties make it suitable for use in forced air cooling processes for polyurethane and in preventing fogging in automotive applications and staining of textiles. It can be added before, during, or after polymerization and is available in a colorless to slightly yellow liquid form.
Typical usage levels of Irganox 1135 range from 0.15% to 0.5%. It is easily emulsifiable and can be added to the process stream dissolved, dispersed, or as a pure liquid. Its performance can be further enhanced by using it in combination with other antioxidants, costabilizers, and light stabilizers.
Physical properties of Irganox 1135 include a melting range of less than -30°C, a flashpoint of 152°C, a vapor pressure of 1.5 E-3 Pa at 25°C, a viscosity of 220 mPa·s at 25°C, a relative density of 0.95 to 1.00 at 20°C, and solubility in various solvents.
Irganox 1135 exhibits low oral toxicity and does not present any abnormal problems in handling or general use. However, it is recommended to carry out investigations and tests to determine the suitability of the product for a particular purpose before use.
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