Methods for producing films using supercritical fluid

Details Methods for producing films using supercritical fluid Methods for producing films using supercritical fluid

2002-05-28

2004-06-15

Drodge, Joseph (Department: 1723)

Coating processes

Direct application of electrical, magnetic, wave, or...

Electrostatic charge, field, or force utilized

C210S634000, C239S003000, C264S012000, C427S180000, C427S331000, C427S336000, C427S377000, C427S421100

Reexamination Certificate

active

06749902

ABSTRACT:

FIELD
The present disclosure relates to methods for forming films on substrates.
BACKGROUND
There is a continuing need for efficient methods for producing films on substrates; particularly thin films made from polymeric materials. Formation of films from particles deposited on substrate surfaces can be accomplished by a variety of methods such as thermal sintering and chemical crosslinking or curing. In all of these methods, the glass transition temperature (T
g
) of the particles is an important factor during film formation. In prior art methods film formation typically occurs only at temperatures higher than the T
g
of the particles. The T
g
of some commercially available materials can be in the range of about 20° C. (e.g., poly(butyl methacrylate)) to an excess of about 200° C. (e.g., poly(bisphenol A terephthalate)). At such high temperatures, the amount of heat required for film formation can lead to the chemical decomposition of the particles, complicate control of the film formation process for achieving desirable film properties, consume energy, and damage or otherwise negatively alter a temperature-sensitive substrate.
SUMMARY OF THE DISCLOSURE
Disclosed herein are methods for forming a continuous film on a substrate surface that involve depositing particles onto a substrate surface and contacting the particle-deposited substrate surface with a supercritical fluid under conditions sufficient for forming a continuous film from the deposited particles. A further method for forming a film on a substrate surface involves depositing particles having a mean particle size of less than 1 micron onto a substrate surface and contacting the particle-deposited substrate surface with a supercritical fluid under conditions sufficient for forming a film from the deposited particles.
The methods can be performed by providing a pressure vessel that can contain a compressible fluid. A particle-deposited substrate is provided in the pressure vessel and the compressible fluid is maintained at a supercritical or sub-critical state sufficient for forming a film from the deposited particles.


REFERENCES:
patent: 4582731 (1986-04-01), Smith
patent: 4734227 (1988-03-01), Smith
patent: 4734451 (1988-03-01), Smith
patent: 4882107 (1989-11-01), Cavender et al.
patent: 5088443 (1992-02-01), Hastings et al.
patent: 5106650 (1992-04-01), Hoy et al.
patent: 5211342 (1993-05-01), Hoy et al.
patent: 5290603 (1994-03-01), Nielsen et al.
patent: 5639441 (1997-06-01), Sievers et al.
patent: 5708039 (1998-01-01), Daly et al.
patent: 5795626 (1998-08-01), Gabel et al.
patent: 5817373 (1998-10-01), Cathey et al.
patent: 5981474 (1999-11-01), Manning et al.
patent: 5981696 (1999-11-01), Saatweber et al.
patent: 5989638 (1999-11-01), Nielsen
patent: 6124226 (2000-09-01), Nielsen et al.
patent: 6475571 (2002-11-01), Echigo et al.
patent: 6509136 (2003-01-01), Goldfarb et al.
patent: 0 506 067 (1992-03-01), None
patent: WO 99/19085 (1999-04-01), None
patent: WO 01/24917 (2001-04-01), None
patent: WO 01/32951 (2001-05-01), None
patent: WO 01/83873 (2001-11-01), None
patent: WO 01/87368 (2001-11-01), None
patent: WO 01/94031 (2001-12-01), None
Mi et al., “A new study of glass transition of polymers by high pressure DSC,”Polymer39(16):3709 (1998).
Rindfleisch et al., “Solubility of Polymers and Copolymers in Supercritical CO2,”J. Phys. Chem. 100:15581-15587 (1996).
Smith et al., “Performance of Capillary Restrictors in Supercritical Fluid Chromatography,”Anal. Chem. 58:2057-2064 (1986).
Tuminello et al., “Dissolving Perfluoropolymers in Supercritical Carbon Dioxide,”Macromolecules28:1506-1510 (1995).
Zhong et al., “High-pressure DSC study of thermal transitions of a poly(ethylene terephthalate)/carbon dioxide system,”Polymer40:3829-3834 (1999).
Jung et al., “Particle design using supercritical fluids: Literature and patent survey,”Journal of Supercritical Fluids20:179-219 (2001).
Matson et al., “Rapid Expansion of Supercritical Fluid Solutions: Solute Formation of Powders, Thin Films, and Fibers,”Ind. Eng. Chem. Res. 26:2298-2306 (1987).

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