UV absorber UV-3638 Molecular formula: C22H12N2O4 CAS NO：18600-59-4 Chemical name: 2,2 '- (1,4-phenylene) bis-4H-3,1-benzoxazin-4-one

Features and Applications/Product Characteristics

UV-3638 is a benzoxazinone ultraviolet absorber that can absorb 280-400 nanometers of ultraviolet light with a peak absorption of 349 nanometers. The absorption range covers UVA UVB， The absorption efficiency is several times that of ordinary ultraviolet absorbers, and the thermal weight loss temperature is as high as 371 degrees Celsius. It has the characteristics of high temperature resistance, extraction resistance, low volatility, low migration, wide absorption range, high absorption efficiency, and also has the properties of blocking short wave blue light and delaying physical loss. Suitable for PET under high temperature processing PBT、PC、PA， Specially suitable for transparent PET films, sheets, and boards, as well as transparent PC films, sheets, and boards. The general dosage is 0.1-0.5%.

Appearance: Off white powder

Molecular weight: 368.3

Content: ≥ 99%

Melting point: 310-315 ℃

Boiling point: 522.8 ° C

Density @ 20 ℃: 1.41g/cm3

Ash content: ≤ 0.1%

Volatile matter ≤ 0.3%

Transmittance of 460 nm ≥ 96%, 500 nm≥99%

Packaging specifications: 25kg cardboard box and drum

Suitable for: sunscreen, personal care products, sun exposure, baby sun care, sun protection decorative cosmetics, broad-spectrum UV filters. In terms of other aspects. Provided them with good light stabilization effect. The dosage is 0.2% -0.5%.