Synthesis and Their Application to UV Curable Paints of New UV Absorbers with Blocked Hydroxyl Group
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概要
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In order to improve the weatherbility of UV curable paint without affecting the curing property, We focused more on the reaction mechanism of UV absorber and tried to design a new type UV absorber.<BR>Hydroxyl groups of UV absorbers were blocked by xanthenecarboxyl group or o-nitorobenzyl-ether. It was shown that these blocked UV absorbers exhibited little retarding effect on the UV curing rate. These blocking groups reproduced hydroxyl group under UV irradiation and deblocked UV absorber that showed the same absorption pattern as the original UV absorber. After accelerated weathering tests, however, the yellowing of the coatings was observed due to the residue of the blocking group. A possibility for the preparation of new UV absorbers that do not affect UV curing by blocking their hydroxyl groups with blocking agents of better weatherability was shown.
- Japan Society of Colour Materialの論文