Cationic Photoinitiators

 

Cationic photoinitiators react differently from free radical photoinitiators. Iodonium salt photoinitiators are the most widely used cationic photoinitiators because of their excellent photosensitivity and the fact that their solubility and other physical properties can be tailored for various applications. When these salts are irradiated with UV light, they undergo homolytic bond cleavage like Type I photoinitiators, and the free radicals formed react with proton donors to form super-strong protonic acids (also called Bronsted or Lewis acids) , and the resulting acid initiates polymerization.

 

TINTOLL is one of the leading photoinitiator suppliers, which is also one of the cornerstone businesses of TINTOLL. Our product portfolio covers free radical and cationic photoinitiators (photo-acid generators) as well as amine synergists. UV-curable materials are widely used in graphic arts, industrial coatings, adhesives, printed circuit boards, and 3D printing. TINTOLL provides application support, product development and custom solutions, and collaborates with customers to develop next-generation cationic photopolymerization.

 

Types of Cationic Photoinitiators

PowerCure™ PAG100

CAS No. 61856-13-8

Diphenyl(4-phenylthio)phenylsufonium Hexafluorophosphate.

 

PowerCure™ PAG101

CAS No. 68156-13-8 + 74227-35-3 + 108-32-7

Diphenyl(4-phenylthio)phenylsufonium Hexafluorophosphate; Bis(4-(diphenylsulfonio)phenyl)sulfide bis(hexafluorophosphate); Propylene carbonate.

 

PowerCure™ PAG110

CAS No. 591773-92-1

10-[1,1'-Bipheny]1-4-yl-2-(1-methylethyl)-9-oxo-9H-thioxanthenium hexafluorophosphate.

 

PowerCure™ PAG120

CAS No. 61358-25-6

Bis(4-tert-butylphenyl)iodonium hexafluorophosphate.

 

PowerCure™ PAG121

CAS No. 60565-88-0

Bis(4-methylphenyl)iodonium hexafluorophosphate.

 

PowerCure™ PAG122

CAS No. 344562-80-7

4-lsobutylphenyl-4'-methylphenyliodoniumhexafluorophosphate.

 

PowerCure™ PAG130

CAS No. 32760-80-8

Cyclopentadienyliron(ii) hexa-fluorophosphate.

 

PowerCure™ PAG123

CAS No. 184477-29-0

[4-(1-Methylethyl)phenyl](4- methylphenyl)iodonium, hexafluorophosphate.

 

PowerCure™ PAG200

CAS No. 71449-78-0

Diphenyl(4-phenylthio)phenylsufonium Hexafluoroantimonate.

 

PowerCure™ PAG201

CAS No. 71449-78-0 + 89452-37-9 + 108-32-7

Diphenyl(4-phenylthio)phenylsufonium Hexafluoroantimonate Bis(4-(diphenylsulfonio)phenyl)sulfide bis(hexafluoroantimonate) Propylene carbonate.

 

PowerCure™ PAG202

CAS No. 71449-78-0 + 89452-37-9

Mixed type triphenyl sulfonium hexafluoroantimonate salt.

 

PowerCure™ PAG230

CAS No. 100011-37-8

Cyclopentadienyliron(ii) hexa-fluoroantimonate.

 

PowerCure™ PAG225

CAS No. 71786-70-4

Bis(4-dodecylphenyl)iodonium hexaflurorantimonate.

 

PowerCure™ PAG226

CAS No. 121239-75-6

(4-Octyloxyphenyl)phenyliodoniumhexafluoroantimonate.

 

PowerCure™ PAG300

CAS No. 178233-72-2

(4-isopropylphenyl)(p-tolyl)iodoniumtetrakis(pentafluorophenyl)borate.

 

PowerCure™ PAG400

CAS No. 42573-57-9

2-[2-(4-Methoxyphenyl-2-yl)vinyl]-4,6-bis(trichloromethyl)1,3,5-triazine.

Classification of Cationic Photoinitiators

 

Cationic photoinitiators can be classified into two main categories based on the type of cations they generate during the photoinitiation process:

 

Onium Salts: These types of photoinitiators generate cations through the cleavage of onium salts. Onium salts contain elements like sulfur, phosphorus, or nitrogen and are known for their ability to generate strong cations. The main subcategories under onium salts include:

 

a. Iodonium Salts: These initiators release iodonium cations upon UV or visible light exposure. They are commonly used in UV-curing applications, including dental composites and coatings.

 

b. Sulfonium Salts: Sulfonium-based photoinitiators generate sulfonium cations. They find applications in various industries, such as adhesives, printing, and electronics.

 

c. Phosphonium Salts: Phosphonium initiators generate phosphonium cations and are used in UV curing for materials like coatings and inks.

 

Metallocene Complexes: In this category, cationic photoinitiators generate cations through the cleavage of metallocene complexes. These initiators are typically used in specific applications, and some common subcategories include:

 

a. Titanocene Complexes: Titanocene-based photoinitiators release titanocene cations. They are used in specialty applications like 3D printing and semiconductor manufacturing.

 

b. Chromium Complexes: Chromium-based initiators release chromium cations and are used in unique applications where their properties are beneficial.

 

TinToll chemical products, one of the leading specialty bulk chemical manufacturers and distributors in China, finds application across various industries, offering a range of specialized and advanced specialty chemicals solutions. From industrial processes requiring precision industrial speciality chemicals to the development of cutting-edge technologies, TinToll's specialty chemicals products play a pivotal role. Their applications span manufacturing, agriculture, pharmaceuticals, and many other sectors, contributing to advancements and efficiencies in diverse fields.