Cosmetic Hydroxyl Compound via Staged Esterification

The patent segments the esterification process into two distinct stages: first reacting triglycerin with isostearic acid to form triglycerin isostearate, then reacting this intermediate with dimer acid. This segmentation prevents the formation of highly viscous polymers that would occur in a single-step reaction, maintaining homogeneous mixing and compatibility with oily bases while still achieving the desired emollient and moisturizing properties.

The patent performs a preliminary esterification reaction between triglycerin and isostearic acid before introducing dimer acid. This preliminary action creates an intermediate product (triglycerin isostearate) with appropriate viscosity and reactivity, preventing the direct formation of high-molecular-weight polymers and ensuring homogeneous composition throughout the final cosmetic product.

The patent segments the oligomerization process by controlling the reaction to form only mono- and di-ester intermediates in the first stage, rather than allowing uncontrolled formation of high-molecular-weight polymers. This segmentation of the molecular weight distribution ensures consistent viscosity and texture while maintaining homogeneous mixing and reproducible manufacturing results.

The patent changes the molecular weight parameter by controlling the esterification degree through staged reactions and appropriate molar ratios. This produces an oligomeric ester with moderate molecular weight that provides sufficient viscosity and texture for cosmetic applications while avoiding the excessive polymerization that would compromise homogeneous mixing and manufacturing reproducibility.