Polymer dispersed cellulose nanocrystals
OwnerThomas O'Lenickinventor
Life of this patent
Estimating the term…
Abstract
The present invention relates to a dispersion of cellulosic nanocrystals (CNCs) that is capable of reflecting/scattering UV radiation. A very specific class of polyesters have found to be effective in making reflective dispersions that can range over a very wide range of radiation, including IR and UV. The resulting dispersion, when applied to the skin or surface, can provide protection from the UV rays of the sun.
Claims10
A cellulose nanocrystal dispersion comprising:
- a. 0.1 to 12% wt/wt of cellulose nanocrystals selected from the group consisting of cellulose nanocrystals functionalized with the following;
- sodium sulfate half ester, carboxylated, imidazolium salts;
- hexyl imidazolium salts, methyl imidazolium salts, imidazolium salts, imidazolium chloride, phosphonium salts, ammonium salts, cellulose nano-fibers and plant based cellulose, cellulose nano-fibers, and plant based cellulose nanocrystals and mixtures thereof:
- and
- b. 88.0-99.9% by weight of a polyester made by the reaction of:
- 1. Guerbet alcohol having the following structure:
- y is an integer ranging from 3-15;
- x is an integer ranging from 5-17;
- 2. 1,3 propanediol having the following structure:
- 3. a diacid selected from the group consisting of:
- and a hydrogenated dimer acid having the following structure:
- and
- mixtures thereof,
- wherein the resulting dispersion reflects/scatters 240-400 nm light.
A process for protecting skin from UV radiation which comprises contacting skin with an effective UV reflecting or scattering dispersion of polymer dispersed cellulose nanocrystals prepared by mixing:
- a. a cellulose nanocrystal selected from the group consisting of cellulose nanocrystals functionalized with the following:
- sodium sulfate half ester, carboxylated, imidazolium salts, hexyl imidazolium salts, methyl imidazolium salts, imidizolum chloride, phosphonium salts, ammonium salts, cellulose nano-fibers and plant based cellulose nano-crystals and mixtures thereof;
- and
- b. a polyester made by the reaction of:
- 1. a Guerbet alcohol having the following structure:
- wherein:
- y is an integer ranging from 3-15;
- x is an integer ranging from 5-17;
- and mixtures thereof;
- and
- 2. a propane diol having the following structure:
- 3. a diacid selected from the group consisting of:
- and a hydrogenated dimer acid having the following structure:
- and mixtures thereof.
Dependencies are inferred from the claim text.