Sublimation transfer paper coating typically contains a variety of chemicals, including:

1. Polymer resins: These are used to provide adhesion and cohesion to the coating. They help to bind the ink to the paper and prevent it from smudging or rubbing off.

2. Dye sublimation ink: This is the ink that is used to transfer the image onto the substrate. It typically contains a combination of dyes and solvents that are designed to sublimate, or turn into a gas, when exposed to heat.

3. Co-solvents: These are added to the coating to help dissolve the dye sublimation ink and improve its flow properties. They also help to reduce the viscosity of the ink, making it easier to apply to the paper.

4. Surface active agents: These are used to improve the wetting and spreading properties of the coating, allowing the ink to be evenly distributed across the paper surface.

5. Fillers: These are used to increase the opacity of the coating and improve its printability. Common fillers include calcium carbonate, titanium dioxide, and kaolin clay.

6. Additives: These are used to improve the performance of the coating in various ways. For example, UV absorbers can be added to improve the coating's resistance to fading when exposed to sunlight. Antioxidants can be added to improve the coating's stability over time.

The exact composition of the coating can vary depending on the manufacturer and the specific application for which the transfer paper is intended.