Question

Carriers are organic compounds that accelerate the disperse dyeing process when added in the bath. Examples of water insoluble carriers are:
A. Trichlorobenzene
B. Diphenol
C. Benzoic Acid
D. O-phenylphenol
Choose the correct answer from the options given below:

• A. A, B and D only
• B. A, B and C only
• C. A, B, C and D only
• D. B, C and D only

Hint:

Carriers help disperse dyes penetrate polyester. Chlorobenzenes and phenols are classic insoluble carriers.

Answer 1

The Correct Option is A

Step 1: Role of carriers in dyeing.
Carriers are added in disperse dyeing (especially polyester dyeing) to help dyes penetrate tightly packed fiber structures.
They swell the fiber, reduce glass transition temperature, and increase dye diffusion.
Step 2: Types of carriers.
- Water-soluble carriers (like phenols, aromatic amines).
- Water-insoluble carriers (chlorinated aromatics, certain phenols).
Step 3: Evaluate each option.
- (A) Trichlorobenzene: Yes, water insoluble carrier.
- (B) Diphenol: Yes, used as a carrier.
- (C) Benzoic Acid: No, it is water soluble, not a carrier.
- (D) O-phenylphenol: Yes, a phenolic compound used as insoluble carrier.
Step 4: Conclusion.
Thus, A, B, and D are water insoluble carriers.