Dry State Coating Process
AssigneeDanisco A/S
InventorsSebastian Gouin, Kathryn Louise Tse, Carsten Bjørn Hansen
Life of this patent
Estimating the term…
Abstract
The present invention relates to a dry state process for coating a substrate, said process comprising the steps of: (A) forming a mixture comprising: (i) particles of a coating material; and (ii) particles of a substrate; wherein the substrate, or at least a portion thereof; and/or the coating material, or at least a portion thereof; is capable of undergoing a glass transition; and (B) sintering the mixture formed in step (A) at a temperature greater or equal to the glass transition temperature of the substrate, or portion thereof, or the coating material, or portion thereof, that is capable of undergoing a glass transition, so as to form a coated substrate.
Claims52
A dry state process for coating a substrate, said process comprising the steps of:
- (A) forming a mixture comprising:
- (i) particles of a coating material;
- and
- (ii) particles of a substrate;
- wherein
- the substrate, or at least a portion thereof;
- and/or
- the coating material, or at least a portion thereof;
- is capable of undergoing a glass transition;
- and
- (B) sintering the mixture formed in step (A) at a temperature greater or equal to the glass transition temperature of the substrate, or portion thereof, or the coating material, or portion thereof, that is capable of undergoing a glass transition, so as to form a coated substrate.
A process according to any preceding claim wherein the mixture is fluidised.
A process according to any preceding claim which is carried out in the absence of mechanical, impact, friction or compression forces.
A process according to any preceding claim wherein the coating material, or at least a portion thereof, is capable of undergoing a glass transition.
A process according to any preceding claim wherein the substrate, or at least a portion thereof, is capable of undergoing a glass transition.
A process according to any preceding claim wherein the coating material, or at least a portion thereof, and the substrate, or at least a portion thereof, are capable of undergoing a glass transition.
A process according to any preceding claim wherein the average particle size of the substrate is at least an order of magnitude greater than the average particle size of the coating material.
A process according to any preceding claim wherein the average particle size of the substrate is one to two orders of magnitude greater in size than the average particle size of the coating material.
A process according to any preceding claim wherein the average particle size of the substrate is more than two orders of magnitude greater in size than the average particle size of the coating material.
A method according to any preceding claim wherein the ratio of substrate to coating material is from about 85 to 95% to about 5 to about 15%.
A process according to any preceding claim wherein the ratio of substrate to coating material is about 90% to about 10%.
A process according to any preceding claim wherein the coating material has a particle size distribution having a Span value of less than about 1.2, where Span is calculated as (D90-D10)/D50.
A process according to any preceding claim wherein the substrate has a particle size distribution having a Span value of less than about 1.2, where Span is calculated as (D90-D10)/D50.
A process according to any preceding claim wherein the coating material comprises a polymeric coating material.
A process according to any preceding claim wherein the coating material comprises a cellulose polymer, or derivative thereof.
A process according to any preceding claim wherein cellulose polymer, or derivative thereof, is selected from hydroxypropylmethylcellulose (HPMC), hydroxypropylcellulose (HPC), methylcellulose (MC) and sodium carboxymethylcellulose (NaCMC).
A process according to any preceding claim wherein the coating material flier comprises a hydrophobic agent.
A process according to any preceding claim wherein the coating material, or at least a portion thereof, is capable of undergoing a glass transition, and the substrate is any solid particle.
A process according to any preceding claim wherein the average particle size (d32) of the substrate is from about 100 to about 1000 μm.
A process according to any preceding claim wherein, the average particle size (d32) of the substrate is from about 300 to about 500 μm.
A process according to any preceding claim wherein the average particle. size (d32) of the coating material is from about 5 to about 150 μm.
A process according to any preceding claim wherein the average particle size (d32) of the coating material is from about 100 to about 150 μm.
A dry state process for coating a substrate substantially as described herein, with reference to any one of the accompanying Examples.
A coated substrate substantially as described herein, with reference to any one of the accompanying Examples.
Dependencies are inferred from the claim text.