Abstract in simplified Chinese:本发明系关于一种用于在一表面上沉积一所欲材料薄膜之方法,其包含:(i)在低于所欲材料固体颗粒之玻璃转移温度之平均流温度下,提供一悬浮于至少一种载体气体中之所欲材料之连续非晶形固体颗粒流,该等固体颗粒之体积加权平均粒径小于500nm,(ii)将(i)中提供之流通过一加热区,并在该加热区内将该流加热以将该平均流温度提高至高于所欲材料之固体颗粒之玻璃转移温度,其中该所欲材料并未因为对该所欲材料加热而发生实质的化学转换,(iii)将该加热流自该加热区通过至少一分布通路排出,其速度大体等于其在步骤(ii)中加入该加热区之速度,其中该载体气体在通过加热区及分布通路时不经历热力相之改变,及(iv)将一处于低于该加热流温度之温度下之接收表面曝露于该加热流之排出流,并使所欲材料颗粒沉积以在该接收表面形成一所欲材料之薄均匀层。
Abstract:
Deposition of a thin film on a surface comprising: (i) providing a continuous stream of amorphous solid particles of desired material suspended in at least one carrier gas at an average stream temperature below the Tg of the particles, (ii) passing the stream into a heating zone to elevate the average stream temperature to above the Tg of the particles, wherein no substantial chemical transformation of the material occurs due to heating, (iii) exhausting the heated stream through at least one distributing passage, at a rate substantially equal to its rate of addition to the heating zone, wherein the carrier gas does not undergo a thermodynamic phase change upon passage through heating zone and distribution passage, and (iv) exposing a receiver surface that is at a temperature below that of the heated stream to the exhausted flow of the heated stream, and depositing particles of the desired material.
Abstract:
A method of disbursing fine particles in a spray including the steps of providing a liquid carrier having a critical point and fine particles of at least one material. The fine particles are dispersed in the liquid carrier. A supercritical carrier containing dispersed particles is created by driving the liquid carrier containing dispersed fine particles above the critical point. The pressure of the supercritical carrier containing dispersed particles is reduced thereby forming a vapor carrier containing dispersed particles therein. The vapor carrier containing disbursed fine particles is then discharged.
Abstract:
A process for the patterning of a desired substance on a surface includes: (i) charging a vessel (12) with a compressed fluid; (ii) introducing into the vessel a first feed stream comprising a solvent and the desired substance and a second feed stream comprising the compressed fluid, wherein the desired substance is less soluble in the compressed fluid relative to its solubility in the solvent and the solvent is soluble in the compressed fluid, wherein the first feed stream is dispersed in the compressed fluid, allowing extraction of the solvent into the compressed fluid and precipitation of particles of the desired substance; (iii) exhausting components from the vessel (12) through a restrictive passage (16) including a discharge device (13) that produces a shaped beam of particles of the desired substance at a point beyond an outlet of the discharge device (13); and (iv) exposing a receiver surface (14) to the shaped beam of particles.
Abstract:
A method and apparatus for applying a coating or paint such as a low-solids adhesion promoter onto a substrate such as a plastic part using an electrostatic process and a supercritical fluid such as CO2 is disclosed. Also disclosed is a spray gun that is desinged to have minimized coating leakages for use in connection with such a method. In one embodiment of the present invention, a paint spraying gun includes a gasket that seals the constituent parts of the gun that form a fluid flow path defined therein so that substantially no combustion or atomization of the fluid flowing therethrough occurs prior to exit from the guns spray tip. In this embodiment, the gun housing is designed to substantially reduce leaking of paint composition into the gun. It should be understood that the abstract of the disclosure is not intended to be and should not be found to be limiting to the scope of the claims contained in this application or in any patent issuing therefrom.
Abstract:
A method of protecting a civil infrastructure substrate from the damaging effects of pollution, noxious fumes, weather, and the like. The method comprises (a) providing a composition carbon dioxide and a fluorocarbon such as a fluoropolyether (preferably a perfluoropolyether) or a fluorocarbon elastomer, optionally having at least one anchoring group such as an amide covalently joined thereto, and (b) applying that composition to the civil infrastructure substrate to form a protective coating thereon. The applying step is preferably carried out by spraying. Compositions useful for carrying out the process of the invention are also disclosed.
Abstract:
The precursor coating compositions contain water and at least one organic solvent and are particularly suitable for being admixed with at least one supercritical fluid used as a viscosity reduction diluent and this resultant liquid mixture of supercritical fluid and precursor coating composition is sprayed onto a substrate to be coated. Processes for spraying this precursor mixture are also disclosed.
Abstract:
The present invention relates to precursor adhesive coating compositions which optionally contain water, which are particularly suitable for being admixed with at least one supercritical fluid used as a viscosity reduction diluent and then spraying this resultant liquid mixture of supercritical fluid and precursor adhesive coating composition onto a substrate to be coated. Processes for spraying these precursor adhesive coating compositions are also disclosed.