Brominated diphenylalkane products and processes

  • US 5,457,248 A
  • Filed: 04/07/1994
  • Issued: 10/10/1995
  • Est. Priority Date: 04/07/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A process for improving the color of a solid, brominated diphenylalkane product having 1 to about 10 carbon atoms in its alkylene bridge and an average bromine number of about 6 or more, comprising:

  • contacting the brominated diphenylalkane product with an aromatic solvent at a temperature above about 175°

    C. to achieve dissolution of the brominated diphenylalkane product in the aromatic solvent;

    cooling the resulting solution to precipitate the brominated diphenylalkane product having an improved color; and

    recovering the brominated diphenylalkane product having a Yellowness Index (ASTM D 1925-70) less than 10.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×