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Uv Absorber Bp-4

  • Product Name: Uv Absorber Bp-4
  • CasNo: 4065-45-6
  • Purity:
  • Appearance: white to yellowish powder

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CasNo: 4065-45-6

Molecular Formula: C14H12O6S

Appearance: white to yellowish powder

Best Quality Reputable Factory Supply Uv Absorber Bp-4 4065-45-6 with Cheap Price

  • Molecular Formula:C14H12O6S
  • Molecular Weight:308.312
  • Appearance/Colour:white to yellowish powder 
  • Vapor Pressure:0Pa at 25℃ 
  • Melting Point:170 °C 
  • Refractive Index:1.5300 (estimate) 
  • Boiling Point:0°C 
  • PKA:-0.70±0.50(Predicted) 
  • Flash Point:0°C 
  • PSA:109.28000 
  • Density:1.449 g/cm3 
  • LogP:2.95930 

2-Hydroxy-4-methoxybenzophenone-5-sulfonic acid(Cas 4065-45-6) Usage

Manufacturing Process

663 g of dichloroethane and 74.6 g 2-hydroxy-4-methoxybenzophenone were charged into a 3-neck flask equipped with stirrer, thermometer, reflux condenser and dropping funnel and a heating mantle. The solution was heated to the reflux temperature (85°C to 86°C) and was dehydrated by distilling off 66.5 g 1,2-dichloroethane. While maintaining at reflux, 30 g chlorosulfonic acid was added slowly over a period of about two hours. The rate of addition was regulated by the speed of evolution of the HCl. After all the chlorosulfonic acid was added, the charge was still maintained at reflux for an additional 15 minutes to remove traces of HCl. It was then cooled to 5°C and filtered. The filter cake was washed with 500 g cold 1,2-dichloroethane and dried. 98 g of product were obtained.

Flammability and Explosibility


Contact allergens

BZP-4 is widely used in cosmetics, particularly shampoos and hair products. Cross-reactivity is rarely expected in patients photoallergic to ketoprofen.

Brand name

Sungard (Bayer).

General Description

Sulisobenzone is a broad spectrum organic UV filter in sunscreen formulations, known to absorb deleterious UV light.


4065-45-6 Relevant articles

Preparation method of sun-screening agent 2-hydroxy-4-methoxy-5-sulfo benzophenone


Paragraph 0052; 0054-0055, (2021/02/06)

The invention provides a preparation met...

Method for synthesizing BP-4 using microreactor


Paragraph 0031-0036, (2020/01/25)

The invention discloses a method for syn...

Synthesis process for 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid


Paragraph 0011, (2016/11/28)

The invention discloses a synthesis proc...

Cosmetic compositions


, (2014/07/08)

Suggested is a cosmetic compositions com...

4065-45-6 Upstream products

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4065-45-6 Downstream products

  • 19337-04-3


  • 121715-18-2

    5-benzoyl-4-hydroxy-2-methoxy-benzenesulfonyl chloride

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  • 1243203-31-7


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