Low-volatility and low-mobility benzoyl formate

Abstract

The invention provides compounds shown in structural formula I. In the formula, n represents 2-10. These compounds have extremely low volatility and mobility, and can be independently used as photoinitiators or be mixed with other photoinitiators for the photopolymerization process of unsaturated carbon-carbon double-bond compounds.

Description

technical field [0001] This application relates to low volatility and low mobility benzoyl formate, used alone as a photoinitiator or mixed with other photoinitiators to prepare photopolymerizable compositions containing unsaturated carbon-carbon double bond compounds. Background technique [0002] In patent documents such as US4038164, US4475999, EP132868A1 and GB1534320A1, benzoyl formate has been used as an independent photoinitiator in various compositions to play a role in photopolymerization. However, in the actual use of photopolymerization coatings, after people noticed the pollution problem of small molecular weight photoinitiators, the demand for photoinitiators with low volatility and low mobility increased with the expansion of the amount of coatings, such as Coatings requiring low odor and low migration are widely used in civil fields such as paper and flooring. Especially for food and drug packaging materials, there are more stringent testing standards to limit...

AI Technical Summary

Problems solved by technology

Such a preparation process is obviously more complicated, which increases the cost of the material and reduces the versatility of the material

WO9833761 discloses the dibenzoyl formate of ethylene glycol, dipolyethylene glycol, and triethylene glycol as a non-volatile photoinitiator. In fact, the molecular weight of ethylene glycol dibenzoyl formate is only 326. The molecular weight of diethylene glycol dibenzoylformate is 370, which is not very ideal in terms of thermal volatility, and can still perceive a relatively obvious odor. The measured thermogravimetric analysis shows that 200 ° C loss of 10%, 250 ℃ has 20% weight loss, 50% loss at 300 ℃, due to high thermal volatility, poor performance in terms of odor and mobility; If it is too short, the water solubility of the ether chain in the structure is relatively large, and it is easy to emulsify and lose water solubility during the manufacturing process, and the manufacturing cost is high; Finally, it is also easy to be soaked and migrated by water, resulting in high mobility, so it is not an excellent and practical photoinitiator

And when the unit alkylene long chain in polyglycol dibenzoylformate structure is too long, can reduce the hardness of cured film; The content of the functional group benzoylformyloxy group is reduced, thereby reducing its initiation efficiency, and the addition amount must be increased to ensure the curing rate, resulting in high cost of use, so the practicability is not strong

Images