Abstract: The present invention relates to a coumarin (keto) oxime ester compound of formula (I), wherein n and R1, R2, R3, R4, R5, R6, and R7 are as defined in the specification. The compound has strong ultraviolet absorption in the range of 300 to 450 nm. After absorbing light energy, it can quickly transfer energy and continuously initiate polymerization. It has obvious advantages in terms of photosensitivity and pattern integrity, and is very suitable for radiation curing by UV-LED light source. In addition, the compound of formula (I) also has good thermal stability. The present invention also relates to a method for preparing the compound of formula (I) and use of the compound. The compound is suitable as a photoinitiator in a UV-LED light curing system and is suitable for the radiation wavelength of UV-LED light curing.

Abstract: The present invention relates to a polymer of formula (I), wherein Ra-Rd, Ra0-Rd0, Ra1-Rd1, Ra2-Rd2, n, n0, n1 and n2 are as defined in the specification. When used as a film-forming resin for a photoresist, the polymer has such advantages as good ultraviolet light transmittance, high viscosity to form a thick film, fast photospeed, and high resolution. The present invention further relates to a process for the preparation of a polymer of formula (I), a use of a polymer of formula (I) as a film-forming resin in a photoresist, and a photoresist comprising a polymer of formula (I) as a film-forming resin.

Abstract: The present invention relates to a coumarin (keto) oxime ester compound of formula (I), wherein n and R1, R2, R3, R4, R5, R6, and R7 are as defined in the specification. The compound has strong ultraviolet absorption in the range of 300 to 450 nm. After absorbing light energy, it can quickly transfer energy and continuously initiate polymerization. It has obvious advantages in terms of photosensitivity and pattern integrity, and is very suitable for radiation curing by UV-LED light source. In addition, the compound of formula (I) also has good thermal stability. The present invention also relates to a method for preparing the compound of formula (I) and use of the compound. The compound is suitable as a photoinitiator in a UV-LED light curing system and is suitable for the radiation wavelength of UV-LED light curing.