1. Application result shows that the said syntan is a good retanning agent for white leather tannage.

2. A new syntan product prepared with tar phenol and lignin sulfonic acid.

3. A new syntan product was prepared with tar phenol and lignin sulfonic acid.

4. In this paper applications and developing process of acrylic resin as retanning agent were discussed, and the synthesis and development of amphoteric acrylic polymer syntan were discussed.

5. The results of the main tanning experiments showed that LB type protein syntan only had a faint tanning property and was not suitable for main tanning process.

6. In addition, the separation method and the Characteristics of compositions and structure for the polycondensate (tannin) set up in this paper can be also used in other aromatic syntan.

7. This study on the tanning and retanning properties of LB type protein syntan respectively was synthesized by the collagen fiber hydrolysates with phenol sulphonate and aldehydes.

8. Moreover, the research methods of the interaction between the hydrophobically modified acrylic syntan and collagen were emphatically discussed.

9. A review on the performance and development of acrylic resin as retanning agent, and the synthesis and development of amphoteric acrylic polymer syntan were discussed in this paper.