Starting from natural amino acid, diphenol having a phenolic hydroxyl group was synthesized. Using the diphenole as comonomer, a biodegradable epoxy resin in which contain amide group.
By adopting the method, the diphenol monomers with a macromolecular structure can be polymerized with the binary acid monomer to obtain the highly heat-resistant and transparent polyester material.
通过上述方法可将具有巨大分子结构的二酚单体与二元酸单体聚合，得到高耐热且透明的聚酯材料。
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The invention relates to a hair dyeing method starting from a composition comprising at least one ortho-diphenol, one metal salt, hydrogen peroxide, (bi)carbonate and a basifying agent.