2-Isopropylthioxanthone CAS 5495-84-1

What is 2-Isopropylthioxanthone CAS 5495-84-1？

2-isopropyl thioxanthrone is solid in form, yellow in color, generally soluble and effective at low concentrations. Absorption wavelength 250 ~ 400nm. 2-isopropyl thioxanthrone is a highly effective UV curing initiator.

Specification

Application

2-isopropyl thioxanthone is an efficient free radical type II photoinitiator, which is suitable for light curing materials composed of unsaturated polyester and acrylic monomer, etc. It can be used in colorless or colored UV curing inks, wood furniture, decorative coatings, adhesives, automotive metal parts coatings, optical fiber manufacturing, print luminous materials, etc. 2-Isopropylthioxanthone acts as a sensitizer when used with a cationic photoinitiator, and can also be used as a photosensitizer to enhance the curing efficiency of photoinitiator 907.

Product Core Selling Points

1. Type II hydrogen-releasing photoinitiator, suitable for medium to long-wave UV light sources, with maximum absorption at 382nm, perfectly matching mercury lamps. It has outstanding curing efficiency in colored and thick-film UV systems and works better when used with amine-catalyzed initiators.
2. Low addition amount takes effect, with good penetration in pigment systems (screen printing ink, paint). It overcomes the problem of pigments blocking ultraviolet light and can fully cure thick coatings.
3. Excellent yellowing control of the system. Compared to similar sulfur heterocyclic ketones, the yellowing of the cured products is less. It is suitable for light-colored / transparent UV inks, wood finishings, electronic photomasking resins, and UV adhesives.
4. Purity is stable ≥ 99%, low volatile content, small odor of the finished product, strong batch consistency, reducing customer formulation fluctuations; soluble in acrylate monomers, some organic solvents, and has good compatibility with unsaturated polyester and acrylic systems.

Packaging

25kg/drum or according to customer requirements.

FAQ

Q: What is the recommended addition amount?
A: Based on the total weight of the resin, it is 0.5 – 3 wt%. For colored inks, it is recommended to be 1 – 2.5%. The final addition amount needs to be determined by the customer through formula testing based on the type of pigment, film thickness, and UV lamp power.

Q: Storage conditions and shelf life?
A: Store in a dark, cool, dry place in an airtight container to avoid light exposure. The original packaging has a shelf life of 24 months at room temperature. Exposure to light will cause the color to gradually darken. It is not recommended to store it open.

Q: Minimum order quantity, samples, and delivery time?
A: Regular samples are available; for bulk orders, the MOQ is 25kg. Regular inventory is delivered within 3 – 7 days. Large orders can be negotiated for production scheduling. Packaging: 20kg / cardboard box (aluminum foil inner bag).

Q: Will it migrate after curing?
A: Adding too much will have the risk of migration. It is recommended to control the addition amount and use the appropriate monomer. For low migration formulations, it is necessary to conduct tests with the resin system.

Q: Why is the product appearance slightly yellowish?
A: ITX is a light yellow crystalline powder and belongs to its natural color. Exposure to light will deepen the color. The depth of color does not indicate a decrease in purity. The purity indicator is determined by HPLC testing.

Q: Storage conditions and shelf life?
A: Store in a dark, cool, dry place in an airtight container to avoid light exposure. The original packaging has a shelf life of 24 months at room temperature. Exposure to light will cause the color to gradually darken. It is not recommended to store it open.