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The optical brighteners can be classified on the basis of chemical structures.

1. Stilbene derivative: More than 80% of the optical brighteners are the derivative of stilbene usually the derivative of 4,4' - di amino stilbene - 2-2' disulfonic acid (Na - salt) are used.
Examples:
1) Blankophor
It is used for whitening of cotton.


2) Tinopal BV

3) Blankophor WT


2. Coumarine derivative

Examples: -- 1) 7 - amino, 4 – methyl coumarin benzaldehyde bisulphite derivative
It is used for whitening of polyster.


3. Heterolytic Vinylene derivative: —
Examples: --- Uvitex RS
Used as brightning agent for cotton and have good fastness to Cl2

4. Naphthalimide derivatives: —
They are used as brightening agent for polyster, polyamide, synthetic fiber and plastic material. The general formula for these dyes is X= -R, - Ar Y= -OR', - NHCOCH:

5. Pyrazine and pyrazoline derivatives: —
They are used for synthetic and wool. BMX=-COOR, --SOH, Y = H, CI
X

6. Pyrene derivatives: —
The brightening agent for synthetic fibre Where X=- NHR, - HR2

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