UV Additives

Co-initiators

Type II photoinitiators require a co-initiator, usually an alcohol or amine, functional groups that can readily have hydrogens abstracted, in addition to the photoinitiator. The absorption of UV light by a Type-II photoinitiator causes an excited electron state in the photoinitiator that will abstract a hydrogen from the co-initiator, and in the process, split a bonding pair of electrons.

Sensitization is the process of energy transfer between a sensitizer and an initiator.  This is commonly used in pigmented UV curing where the UV absorption of the pigment is much stronger than that of the initiator, thus inhibiting polymerization. A sensitizer is added that absorbs UV energy at wavelengths outside those absorbed by pigments and transfers it to the initiator.

When used without other coinitiators, hexaarylbisimidazoles require a chain transfer agent or hydrogen donor to efficiently initiate polymerization. Nitrogen compounds such as N-Phenylglycine as well as thiols (2 MBO, 2 MBT) are typically used as co-initiators with the HABI molecule.

Hampford Research specializes in the manufacture of high purity photoinitiators, co-inititiators and sensitizers for all photoactive applications. For more information, or to request samples please Click Here.

Product NameFunctionCAS NumberHRI Prod. #
Ethyl-4-dimethylamino benzoate (EDAB)Coinitiator, tertiary amine10287-53-3FP5170
N-Phenylglycine (NPG)Coinitiator, secondary amine103-01-5FP5360
N-Phenylglycine (NPG) LTMCoinitiator, secondary amine103-01-5FP5365

Dyes

Hampford Research is a leading provider of custom laser dyes, near infrared absorption dyes, dye intermediates, and blends for multiple dye applications. Our unique synthesis and purification methodology assures customers of consistent quality and performance.

For more information, or to request samples please Click Here.

Product NameFunctionCAS NumberHRI Prod. #
JAWHolographic dye, 490-500nm, sensitizer, sensitizing dye125594-50-5FP5200
SD-184Holographic dye, 530-540nm, sensitizer, sensitizing dye154482-35-6FP5432
TMISQ DYEHolographic dye, 630-640nm, sensitizer, sensitizing dye12243-46-8FP5490
IR 775 TosylateInfrared dye, 770-780nm, sensitizer, sensitizing dye205744-92-9FP5194
IR 813 TosylateInfrared dye, 810-820nm, sensitizer, sensitizing dye134127-48-3FP5192
9-PhenylacridinePhotoinitiator type II, sensitizer, sensitizing dye602-56-2FP5400
DibromochalconePhotoinitiator, sensitizer, sensitizing dye611-91-6FP5080
BFBKSensitizer, sensitizing dye, 410-420nm24293-93-4FP5059