GB2148747A - Liquid film transfer process - Google Patents

Liquid film transfer process Download PDF

Info

Publication number
GB2148747A
GB2148747A GB08329433A GB8329433A GB2148747A GB 2148747 A GB2148747 A GB 2148747A GB 08329433 A GB08329433 A GB 08329433A GB 8329433 A GB8329433 A GB 8329433A GB 2148747 A GB2148747 A GB 2148747A
Authority
GB
United Kingdom
Prior art keywords
absorbent material
film
liquid
circuit
uniform
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08329433A
Other versions
GB2148747B (en
GB8329433D0 (en
Inventor
Ronald Carl Stern
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB08329433A priority Critical patent/GB2148747B/en
Publication of GB8329433D0 publication Critical patent/GB8329433D0/en
Publication of GB2148747A publication Critical patent/GB2148747A/en
Application granted granted Critical
Publication of GB2148747B publication Critical patent/GB2148747B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/16—Coating processes; Apparatus therefor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A surface coating is applied to a substrate by dispersing the coating material in liquid form on an absorbent material, placing the absorbent material in contact with the substrate and applying pressure to exude the liquid on to the substrate to provide a uniform surface coating. The process is used to provide protective coatings on film circuits. The absorbent material may be a filter paper to which the coating material is applied using a roller. Pressure is applied by rolling.

Description

SPECIFICATION Liquid film transfer process This invention relates to methods of applying thin polymeric films onto a substrate and in particular to a liquid film transfer process for applying such films.
Conventionally polymeric films that are formed from a solution of the polymer or for the corresponding liquid monomer. The liquid material is applied to a substrate which is then rotated so that the centrapetal force spreads the material into a thin film of substantially uniform thickness. Other methods of application of a film include spraying and roller coating.
These methods give satisfactory results on a uniform flat surface but are in general unsuited to the coating of non-uniform surfaces. Typical of such non-uniform surfaces is an array of discrete semiconductor other devices mounted on a substate carrier. Such a structure cannot be coated uniformly by the spinning technique. Also, spray and roller coating have been found to provide very uneven coatings due to build-up of the coating material at the device edges.
The object of the present invention is to minimise or to overcome these disadvantages.
According to one aspect of the invention there is provided a method of applying a liquid film to a substrate surface, the method including placing on the surace a flexible absorbent material containing a quantity of the liquid, and applying pressure to the absorbent material so as to exude a uniform layer of the liquid on to said substrate surface.
According to another aspect of the invention there is provided a method of providing a film circuit with a uniform protective plastics film, the method including placing on the circuit a flexible absorbent material containing a quantity of the plastics dissolved in a solvent, applying pressure to the absorbent material so as to exude a surface layer of the solution or to the circuit, and evaporating the solvent to leave a uniform surface fibre of the plastics material.
We have found that this transfer coating technique provides a uniform surface film on a relatively uneven surface.
To effect coating of a surface a quantity of the liquid coating material is applied to a flexible absorbent material, typically a filter paper, and is spread to give a visually uniform appearance. This spreading of the material may be effected by the use of a roller. The absorbent material is then placed face down on the surface of a substrate to be coated and pressure is applied, e.g. by rolling, to exude a quantity of the liquid from the absorbent material on to the surface thus providing a substantially uniform surface film. The absorbent material is then removed and the surface coating is allowed to flow evenly and to dry to a uniform surface film which adheres to the surface and follows the surface contours.
The thickness of the applied film depends primarily on the viscosity of the polymer solution and very little on the amount applied to the absorbent material. For a proprietary photoresist solution, e.g. the type AZ 1350 which is supplied by Shipley with a viscosity of 7.5 cp, the thickness of the dried film is 1.2 i 0.1 microns, and does not vary by more than i 0.1 microns across a 75 mm diameter substrate. This single-parameter dependence makes this technique superior in terms of thickness reproducibility and control to the other application techniques.
Another feature of the transfer technique is that further applications add quantitatively to the thickness of the dried film; hence a double application with an air dry in between gives a film of double thickness. This control is not possible with the resit spinning technique for example since the surplus liquid from the second application always takes with it an unpredictable dissolved amount of the first coating.
The technique may be employed in a variety of applications but it is particularly advantageous for the passivation coating of film circuits a uniform surface layer.

Claims (10)

1. A method of applying a liquid film to a substrate surface the method including placing on the surface a flexible absorbent material containing a quantity of the liquid, and applying pressure to the absorbent material so as to exude a uniform layer of the liquid on to said substrate surface.
2. A method as claimed in claim 1, wherein the substrate comprises a film circuit.
3. A method as claimed in claim 1, wherein the liquid comprises a solution of a polymer.
4. A method of providing a film circuit with a uniform protective plastics film, the method including placing on the circuit a flexible absorbent material containing a quantity of the plastics dissolved in a solvent, applying pressure to the absorbent material so as to exude a surface layer of the solution on to the circuit, and evaporating the solvent to leave a uniform sufrace layer of the plastics material.
5. A method as claimed in claim 4, wherein the polymer is a photoresist material.
6. A method as claimed in claim 4 or 5, wherein the layer thickness is from 1.1 to 1.3 microns.
7. A method as claimed in claim 4 or 5 wherein the layer comprises a multilayer film.
8. A method as claimed in claim 1, wherein the absorbent material comprises a paper.
9. A method of coating a substrate surface substantially as described herein.
10. Afilm circuit coated by a method as claimed in any one of claims 1 to 9.
GB08329433A 1983-11-03 1983-11-03 Liquid film transfer process Expired GB2148747B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08329433A GB2148747B (en) 1983-11-03 1983-11-03 Liquid film transfer process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08329433A GB2148747B (en) 1983-11-03 1983-11-03 Liquid film transfer process

Publications (3)

Publication Number Publication Date
GB8329433D0 GB8329433D0 (en) 1983-12-07
GB2148747A true GB2148747A (en) 1985-06-05
GB2148747B GB2148747B (en) 1986-10-15

Family

ID=10551201

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08329433A Expired GB2148747B (en) 1983-11-03 1983-11-03 Liquid film transfer process

Country Status (1)

Country Link
GB (1) GB2148747B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB320477A (en) * 1928-09-03 1929-10-17 John Wilfred Haughton Improvements relating to moistening or dampening of fabrics, yarns, and like materials
GB1096308A (en) * 1965-06-07 1967-12-29 Eastman Kodak Co Photographic film processing apparatus
GB1475051A (en) * 1975-02-05 1977-06-01 Ici Ltd Coating processes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB320477A (en) * 1928-09-03 1929-10-17 John Wilfred Haughton Improvements relating to moistening or dampening of fabrics, yarns, and like materials
GB1096308A (en) * 1965-06-07 1967-12-29 Eastman Kodak Co Photographic film processing apparatus
GB1475051A (en) * 1975-02-05 1977-06-01 Ici Ltd Coating processes

Also Published As

Publication number Publication date
GB2148747B (en) 1986-10-15
GB8329433D0 (en) 1983-12-07

Similar Documents

Publication Publication Date Title
US4781941A (en) Method of matting pre-sensitized plates
EP2220917B1 (en) Methods for manufacturing electronic devices by tip printing and scrape coating
US5773083A (en) Method for coating a substrate with a coating solution
KR910005028B1 (en) Coating equipment by roll
GB2148747A (en) Liquid film transfer process
US11254158B2 (en) Blanket manufacturing apparatus and blanket manufacturing method
JPS5541865A (en) Formation of woven pattern
JPS61150332A (en) Method of applying semiconductor resist
KR101188422B1 (en) Pattern forming method and apparatus by surface tension and viscosity of coating substances
JPH06502279A (en) How to paint plates with ridges, especially printed circuit boards
KR970012799A (en) Films and coatings with anisotropic conductive paths
JPS6311939B2 (en)
EP0336367A2 (en) Double-side simultaneous coating equipment
JPS58183283A (en) Method for printing thin film
JPS5799370A (en) Coating method for inorganic sheet material having rugged pattern
JPH05138105A (en) Coating method and device
JPH0440254A (en) Apparatus for manufacturing re-release sheet
JP2001276696A (en) Roll coater
JPH0831675B2 (en) Solder-resist coating method for printed wiring board
JPH0344824B2 (en)
JPS61238050A (en) Coating method
JPS59203665A (en) Roll coating method and apparatus therefor
JPH04125641A (en) Exposing film used for production of printed circuit board
JPS5771662A (en) Solventless laminator coater
JPH05185020A (en) Film forming method by spinner

Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee