IK-20B Ionic Photoacid Generator, Photo-Cationic Polymerization Initiator, Iodonium

Sulfonium Series

CPI®-100 / 200series UV
UV light / i-line

CPI-100P(liquid)
CPI-110P(powder)
CPI-100B(40)(liquid)
CPI-110B(powder)
CPI-101A(liquid)
CPI-200K(liquid)
CPI-210S(powder)
cation
(light-absorbing site)

CPI®-300series
i-line

CPI-310FG(powder)
CPI-310B(powder)
cation
(light-absorbing site)

VC-1 VC-2 Series (development product)
i-line

VC-1FG(powder)
cation
(light-absorbing site)

CPI®-400series
g-line / h-line/ i-line

CPI-410S(powder)
CPI-410B(powder)
cation
(light-absorbing site)

ES-1 (development product)
ES-2 (development product)
g-line / h-line/ i-line

ES-1B(powder)
ES-2B(powder)
cation
(light-absorbing site)

Photoacid Generator(Iodonium)
IK Series

IK-1(powder)
IK-1FG(powder)
cation
(light-absorbing site)

IK-20B(powder)
cation
(light-absorbing site)

Nonionic Photoacid Generator

NAseries
(development product)
i-line compatible

NA-CS1(powder)
Aryl amide skeleton with
a light-absorbing moiety

Thermal acid generator

Thermal acid generator(Overview and Function Map)

TA Series(Sulfonium Salt Type)

TA-100(powder)
TA-100FG(powder)
cation

IKseries(Iodonium Salt Type)

IK-1(powder)
IK-1FG(powder)
cation

AAseries(Ammonium Salt-Type)

AA-01(powder)
cation

IK-20B(powder)
cation

Thermal Base Generators

DBU Salt Thermal Base Generators

DBU Salt

U-CAT SA 1(liquid)
U-CAT SA 102(liquid～solid)
U-CAT SA 603(solid)
U-CAT SA 810(solid)
U-CAT SA 506(liquid～solid)

Ammonium Salts

U-CAT 18X(liquid～solid)

IK-20BIonic Photoacid Generator, Photo-Cationic Polymerization Initiator, Iodonium

Characteristics and Applications

IK-20B is an iodonium salt type photoacid generator. Combined with a sensitizer, it can handle longer wavelengths.
Its anionic structure is borate, and it exhibits high cationic polymerization.
It also has excellent low outgassing during polymerization and low metal corrosion of the cured material.
It can also be used as a high-temperature type thermal acid generator.
IK-20B is a non-solvent type powder product.

Differences from sulfonium salt types

Compared to the sulfonium salt type, the iodonium salt type has relatively poor storage stability when blended with cationic polymerizable resins, but a large sensitizer effect can be expected when used in combination with a sensitizer.
Recommended sensitizers

Anthracene-based sensitizers such as butoxyanthracene (DBA) and thioxanthone-based sensitizers such as isopropylthioxanthone (IPTX) are expected to provide significant sensitization.
Polymerization initiation temperature

When blended with bisphenol A glycidyl ether, polymerization starts at 210°C.
Characteristics of the generated acid [HB(C6F5)4]

It has high acid strength and reactivity equivalent to HSbF6. It is also resistant to hydrolysis and does not generate hydrofluoric acid, thus preventing corrosion of surrounding metal parts.
Recommended amount of additive

Depending on the application and film thickness, add about 0.5 to 1 wt% to the resin.

Product

Structure	Anion	CAS RN®	M.W.	Appearance	color	High sensivity for i-line	Low coloration	gh ray high sensitivity	High solubility	High Activity（Strong acid）	Solution product	non-PFAS	Low corrosiveness	Packing	Stage
	B(C₆F₅)₄	198641-40-6	1072	Powder	White ～Light yellow					✔		✔	✔	0.5kgBottle	Pilot

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In recent years, there has been a worldwide tightening of regulations on per- and polyfluoroalkyl substances (PFAS), and we are focusing on the development of PFAS-free products to ensure that our customers can use them with peace of mind. Please also make use of our existing lineup of PFAS-free products.

*PFAS: OECD definition published in2021