# US 5,710,203 A · Electronic coating compositions

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- Number: US 5,710,203 A
- Document ID: US5710203A
- Status: Granted
- Kind: A
- Application number: 08/334,988
- Filed: 1994-11-07
- Granted: 1998-01-20
- Earliest claimed: 1993-03-08
- Assignees: Dow Corning Corporation
- Inventors: Robert Charles Camilletti; Loren Andrew Haluska; Keith Winton Michael
- Web page: https://patentgrep.com/patent/US5710203A

## CPC

- C04B 41/87: Ceramics
- C03C 17/007: {containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase}
- C03C 17/009: {Mixtures of organic and inorganic materials, e.g. ormosils and ormocers}
- C03C 17/3411: {with at least two coatings of inorganic materials (C03C17/36, C03C17/42 take precedence)}
- C03C 17/3417: {all coatings being oxide coatings}
- C03C 17/3435: {comprising a nitride, oxynitride, boronitride or carbonitride}
- C03C 17/3441: {comprising carbon, a carbide or oxycarbide}
- C04B 41/009: {characterised by the material treated}
- C04B 41/5035: {Silica}
- C09D 183/04: Polysiloxanes
- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- C09K 11/08: containing inorganic luminescent materials
- C14C 11/00: Surface finishing of leather
- C23C 18/1208: {Oxides, e.g. ceramics}
- C23C 18/1212: {Zeolites, glasses}
- C23C 18/122: {Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes}
- C23C 18/1225: {Deposition of multilayers of inorganic material}
- C23C 18/127: {Preformed particles}
- C23C 18/1279: {performed under reactive atmosphere, e.g. oxidising or reducing atmospheres}
- H10W 42/00: Arrangements for protection of devices (arrangements for thermal protection H10W40/00)
- H10W 42/40: protecting against tampering, e.g. unauthorised inspection or reverse engineering
- C03C 2217/45: Inorganic continuous phases
- C03C 2217/465: having a specific shape
- C03C 2217/47: consisting of a specific material
- C03C 2217/475: Inorganic materials
- C03C 2217/479: Metals
- C04B 2111/00844: {for electronic applications}
- C04B 2111/80: Optical properties, e.g. transparency or reflexibility
- C04B 2111/94: Electrically conducting materials
- H10D 89/00: Aspects of integrated devices not covered by groups H10D84/00 - H10D88/00
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C14C: CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING (bleaching of leather or furs D06L; dyeing of leather or furs D06P)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES

## Abstract

Disclosed are compositions which can be used to form tamper-proof coatings on electronic devices. These compositions contain a silica precursor resin and a filler which reacts in an oxidizing atmosphere to liberate heat. Such compositions form coatings which, when oxidized by techniques such as plasma etching, wet etching, or cross-sectioning, liberate heat which causes destruction of the underlying substrate and, thus, inhibits further examination.

## Claims

### Claim 1

A coating composition comprising a silica precursor resin and a filler diluted in a solvent, wherein the filler is a metal which reacts in an oxidizing atmosphere to liberate heat selected from the group consisting of magnesium, iron, silicon, tin and zinc.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the silica precursor resin is selected from the group consisting of hydrogen silsesquioxane resin and hydrolyzed or partially hydrolyzed R.sub.n Si(OR).sub.4-n, wherein R is an aliphatic, alicyclic or aromatic substituent of 1-20 carbon atoms and n is 0-3.

### Claim 3 (depends on 1)

The composition of claim 1 also containing a modifying ceramic oxide precursor comprising a compound containing an element selected from the group consisting of titanium, zirconium, aluminum, tantalum, vanadium, niobium, boron and phosphorous wherein the compound contains at least one hydrolyzable substituent selected from the group consisting of alkoxy or acyloxy and the compound is present in an amount such that the coating contains 0.1 to 30 percent by weight modifying ceramic oxide.

### Claim 4 (depends on 2)

The composition of claim 2 also containing a platinum, rhodium or copper catalyst in an amount of between about 5 and about 1000 ppm platinum, rhodium or copper based on the weight of hydrogen silsesquioxane resin.

### Claim 5 (depends on 1)

The composition of claim 1 also containing a material which modifies the surface of the filler.

### Claim 6 (depends on 1)

The composition of claim 1 also containing a suspending agent.

### Claim 7 (depends on 1)

The composition of claim 1 wherein the filler is in a form selected from the group consisting of powders, particles, and flakes.

### Claim 8 (depends on 1)

The composition of claim 1 wherein the filler is present in the coating composition in an amount in the range of about 5 to about 80 weight percent.