Articles of manufacture comprising nanocellulose elements
The present invention provides formulations comprising a suspension of nanocellulose (NC) elements and a drying/dispersal additive selected from the group consisting of temperature-responsive polymers, small molecule additives in volatile systems, and blocking agents and methods of preparing such formulations, and further provides NC-containing materials, composite materials and useful articles of manufacture made therefrom.
1. A method of producing an article of manufacture comprising a redispersible, dried nanocellulose (NC)-containing matrix with nanocellulose elements (NCEs) embedded therein and an active agent, wherein the active agent is a household product or a laundry product, the method comprising:
drying a liquid formulation to form the redispersible, dried NC-containing matrix, wherein the liquid formulation comprises a suspension of the nanocellulose elements (NCEs) in a liquid medium and a drying/dispersal additive, wherein the drying/dispersal additive is a lower critical solution temperature (LCST) polymer or a short-chain oligomer derived from the LCST polymer, and wherein the drying/dispersal additive disrupts hydrogen bonding between the nanocellulose elements during the drying;
wherein the redispersibility of the dried NC-containing matrix is greater than that of a dried control matrix prepared by drying a control suspension of the nanocellulose elements in the liquid medium, wherein the control suspension lacks the drying/dispersal additive, and
wherein the redispersible, dried NC-containing matrix comprises interstices and wherein the active agent is within the interstices of the matrix, or wherein the active agent is dispersed on the surface of the matrix, or
wherein the matrix encloses the active agent.
2. The method of claim 1 , wherein the drying/dispersal additive is a lower critical solution temperature (LCST) polymer.
3. The method of claim 1 , wherein the active agent is within the interstices of the matrix.
4. The method of claim 1 , wherein the active agent is dispersed on the surface of the matrix.
5. The method of claim 1 , wherein the matrix is shaped as at least one dried sheet.
6. The method of claim 5 , wherein the at least one dried sheet is a plurality of dried sheets in a layered arrangement.
7. The method of claim 6 , wherein the active agent is dispersed on the surface of one or more of the dried sheets in the layered arrangement.
8. The method of claim 1 , wherein the active agent is the laundry product, and the laundry product is selected from the group consisting of bleaches, laundry detergents, enzymes, fabric softeners, static reducers, and fragrances.
9. The method of claim 1 , wherein the active agent is selected from the group consisting of laundry detergents, enzymes, and bleaches.
10. The method of claim 1 , wherein the active agent is selected from the group consisting of fabric softeners, static reducers, and fragrances, and wherein the active agent is applied as a waxy layer to the matrix, wherein the waxy layer is capable of melting in a hot dryer to release the active agent from the waxy layer.
11. The method of claim 1 , wherein the matrix that encloses the active agent is formed as a sheet.
12. The method of claim 2 , wherein the LCST polymer is selected from the group consisting of methyl cellulose, hydroxylethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, ethylhydroxyethyl cellulose, polyvinylcaprolactam, poly(methyl vinyl ether), poly(N-isopropylacrylamide), poly(N,N-diethylacrylamide), poly(ethylene oxide) and poly(propylene oxide) block copolymer, and elastin poly(pentapeptide).