# US 7,611,668 B2 · Marker paint

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- Number: US 7,611,668 B2
- Document ID: US7611668B2
- Status: Granted
- Kind: B2
- Application number: 12/213,844
- Filed: 2008-06-25
- Published: 2008-10-30
- Granted: 2009-11-03
- Earliest claimed: 2003-02-14
- Assignees: ROLLS-ROYCE plc
- Inventors: Hugh M. L. Watson; Elaine C. Hodgkinson
- Web page: https://patentgrep.com/patent/US7611668B2

## CPC

- C09D 5/26: Thermosensitive paints
- F01D 17/085: {to temperature}
- F01D 21/12: responsive to temperature
- G01K 3/04: in respect of time
- G01K 11/12: using changes in colour, translucency or reflectance
- G01K 13/08: in rotary movement
- F01D 5/288: {Protective coatings for blades}
- F05D 2260/80: Diagnostics
- F05D 2300/437: Silicon polymers
- F05D 2300/44: Resins
- 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)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A marker paint comprises 42 wt % to 52 wt % pigment, 31 wt % to 37 wt % acrylic resin and 17 wt % to 21 wt % silicone resin excluding solvent. The pigment comprises cobalt titanium oxide, titanium nickel antimony oxide, cobalt aluminum oxide or cadmium sulphide selenium to give a green, yellow, blue or red color respectively. The marker paint is used in conjunction with an irreversible temperature indicating paint to determine if there is any debris and/or dirt on the irreversible temperature indicating paint to affect the accuracy of the temperature measurement of the irreversible temperature indicating paint.

## Claims

### Claim 1

A marker paint comprising a pigment, a binder and a solvent, the pigment comprising cobalt titanium oxide, titanium nickel antimony oxide, cobalt aluminium oxide or cadmium sulphide selenium, wherein
the marker paint comprises 42wt % to 52wt % pigment and the binder comprises 31wt % to 37wt % acrylic resin and 17wt % to 21wt % silicone resin,
the marker paint is capable of withstanding temperatures up to at least 1100° C, and
the marker paint does not change color.

### Claim 2 (depends on 1)

A marker paint as claimed in claim 1 comprising 45 wt % to 49 wt % pigment, 32.5 wt % to 35.5 wt % acrylic resin and 18 wt % to 20 wt % silicone resin, excluding solvent.

### Claim 3 (depends on 1)

A marker paint as claimed in claim 1 comprising 47 wt % pigment, 34 wt % acrylic resin and 19 wt % silicone resin, excluding solvent.

### Claim 4 (depends on 1)

A marker paint as claimed in claim 1, wherein the acrylic resin comprises polybutyl methacrylate.

### Claim 5 (depends on 1)

A marker paint as claimed in claim 1 wherein the solvent comprises a mixture of propylene glycol ethers.

### Claim 6 (depends on 5)

A marker paint as claimed in claim 5 wherein the solvent comprises a mixture of 80% 1-methoxy-2-propanol and 20% dipropylene glycol monomethyl ether.

### Claim 7 (depends on 1)

A marker paint as claimed in claim 1, wherein the marker paint is a green marker paint and the pigment comprises cobalt titanium oxide.

### Claim 8 (depends on 1)

A marker paint as claimed in claim 1, wherein the marker paint is a yellow marker paint and the pigment comprises titanium nickel antimony oxide.

### Claim 9 (depends on 1)

A paint as claimed in claim 1, wherein the marker paint is a blue marker paint and the pigment comprises cobalt aluminum oxide.

### Claim 10 (depends on 1)

A marker paint as claimed in claim 1, wherein the marker paint is a red marker paint and the pigment comprises cadmium sulphide selenium.