1. What is the Development of Water Soluble Polyester Resin?
The technology of water-soluble polyester resin was firstly developed by EASTMAN USA Company. And then it spread to the rest of the world. Nowadays, the main manufacturers lie in India and China. And Indian companies are more popular, like Zydex and Ran Chemical.

The founders of these two factories were studying in the USA and then worked there. In 1998, they came back to India and finished the development of this product in around 2001. Hubei Decon started the research and development of this resin in 2009. Till now our product is widely used in the domestic market.

Before polyester resin came out, the sizing chemical market was dominated by Acrylic binders. Japanese Company, MATSUMOTO, and GOO CHEMICAL were leading suppliers.

2. What is Recommended Solid Percentage in Water and Solid Pick-up Percentage on Yarn?
Solid % in water: it varies from 13% to 16% based on machine condition.
Pick-up % on yarn: it varies based on different conditions, like rubber roll, steel roll pressure, and squeeze roll pressure. But the dry pickup percentage must be 6% on solid bases.

3. Is Resin Solution Stable under Alkalic Conditions?
If the polyester resin is used for yarn sizing, its solution will not be stable under alkalic conditions. Because after the weaving process, the resin in the fabric will be removed mostly by the alkali. If it is stable, the residue will affect the dyeing, printing, and finishing process.
According to our experience, some customers tend to add some alkalic chemicals during the cooking process of compound sizing chemicals.  Alkali is used to improve the dissolving ability of resin.

4. Why is There Residue in the Cooking Tank?
For WSP-010, the residue percentage is from 0.3% to 1.5%. It is the lowest in winter and the highest in summer.

5. Is the resin anionic or nonionic?
Yes. Our water-soluble polyester resin is anionic and it should not be used with cationic. It is only compatible with anionic and nonionic compounds. For example, acrylic size is nonionic.