Free Radical Photoinitiators - Type I

 Free radical photoinitiators react differently when exposed to UV light. Depending on their reactivity, they are classified as Norrish photoinitiator type 1 and 2.

 

Norish type i photoinitiator are typically compounds containing a benzoyl group which, when exposed to UV light, cleaves to produce two highly reactive free radicals, at least one of which reacts with the monomer to initiate polymerization. Type I photoinitiators are irreversibly incorporated into the polymer matrix.

 

Norrish Type II photoinitiators require hydrogen donors to react when exposed to UV light, and the most common of these hydrogen donors are amines (amine synergists). Upon UV irradiation, the Type II photoinitiator abstracts a hydrogen atom from the synergist used to form two very reactive alkylamino radicals, which subsequently initiate polymerization. Type II photoinitiators are generally not incorporated during the reaction, but synergists are incorporated.

 

TINTOLL is one of the photoinitiator manufacturers, which is also one of the cornerstone businesses of TINTOLL. Our product portfolio covers free radical and cationic photoinitiators (photo-acid generators) including photoinitiator type 1 and 2, 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 photoinitiators.

 

Types of Free Radical Photoinitiators - Type I

PowerCure™ 1173

CAS No. 7473-98-5

2-hydroxy-2-methyl-1-phenylpropanone.

PowerCure™ 184

CAS No. 947-19-3

1-Hydroxy-cyclohexyl-phenyl-ketone.

PowerCure™ 127

CAS No. 474510-57-1

2-hydroxy-1-(4-(4-(2-hydroxy-2-methylpropionyl)benzyl)phenyl)- 2-methylpropan-1-one.

PowerCure™ 2959

CAS No. 106797-53-9

1-[4-(2-hydroxyethoxyl)-phenyl]-2-hydroxy-methylpropanone.

PowerCure™ 369

CAS No. 119313-12-1

2-benzyl-2-(dimethylamino)-4’-morpholinobutyrophenone.

PowerCure™ 379

CAS No. 119344-86-4

2-dimethylamino-2-(4-methyl-benzyl)-1-(4-morpholin-4-yl-phenyl)-butan-1-one.

PowerCure™ 907

CAS No. 71868-10-5

2-Methyl-1-[4-(methylthio)phenyl]-2- (4-morpholinyl)-1-propanone.

PowerCure™ 651

CAS No. 24650-42-8

2,2-dimethoxy-2-phenylacetophenone.

PowerCure™ TPO

CAS No. 75980-60-8

2,4,6-trimethylbenzoyl-diphenyl phosphine oxide.

PowerCure™ TPO-L

CAS No. 84434-11-7

Ethyl(2,4,6-trimethylbenzoyl)-phenyl phosphinate.

PowerCure™ 819

CAS No. 162881-26-7

Bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide.

PowerCure™ ONE

CAS No. 163702-01-0

Difunctional alpha-hydroxy ketone photoinitiator.

PowerCure™ 150

CAS No. 163702-01-0

Oligomeric alpha hydroxy ketone 100%.

PowerCure™ 151

CAS No. 163702-01-0 + 7473-98-5

Oligomeric alpha hydroxy ketone (70% wt) and 2-hydroxy-2-methylpropiophenone (30% wt).

PowerCure™ 152

CAS No. 163702-01-0 + 42978-66-5

Oligomeric alpha hydroxy ketone (75% wt) and tripropylene glycol diacrylate (25% wt).

PowerCure™ BCIM

CAS No. 7189-82-4

2,2'-Bis(2-chlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole.

PowerCure™ DEAP

CAS No. 6175-45-7

2,2-Diethoxy-1-phenylethanone.

PowerCure™ 1314

CAS No. 253585-83-0

1-[4-(Phenylthio)phenyl]-1,2-octanedione 2-(O-benzoyloxime).

PowerCure™ 160

CAS No. 71868-15-0

Difunctional alpha hydroxy ketone type I photoinitiator 2-Hydroxy-1-[4-[4-(2-hydroxy-2-methylpropionyl)phenoxy]phenyl]-2-methylpropanone.

PowerCure™ 1000

CAS No. 947-19-3 + 7473-98-5

20% PowerCure 184 and 80% PowerCure 1173.

PowerCure™ 4265

CAS No. 75980-60-8 + 7473-98-5

50% PowerCure TPO and 50% PowerCure 1173.

PowerCure™ 2022

CAS No. 7473-98-5 + 84434-11-7 + 162881-26-7

Blend of Omnirad 1173 + Omnirad TPO-L + Omnirad 819.

PowerCure™ 2100

CAS No. 162881-26-7 + 84434-11-7

Blend of Omnirad 819 + Omnirad TPO-L.

PowerCure™ TMO

CAS No. 270586-78-2

(2,4,6-Trimethylbenzoyl)- bis(4-methylphenyl)phosphinyl oxide.

 

What is a Type I Photoinitiator?

The two most common types of photoinitiators are free radicals and cationic.

 

Type I photoinitiators are a type of photoinitiator that absorb light and split into two primary radicals.

 

These photoinitiators are aromatic carbonyl organic compounds that undergo a homolytic or heterolytic bond cleavage after light excitation. The radicals then initiate the polymerization.

 

Typical type I photoinitiators include: Alpha hydroxy ketones and phosphine oxides.

 

Type II photoinitiators, also known as photosensitizing photoinitiators or co-initiators, extract hydrogen from the co-initiator to generate secondary radicals.

 

Typical type II photoinitiators include: Benzophenones, Thioxanthones.

 


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