# US 5,348,799 A · Antistatic coatings comprising chitosan acid salt and metal oxide particles

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- Number: US 5,348,799 A
- Document ID: US5348799A
- Status: Granted
- Kind: A
- Application number: 07/753,863
- Filed: 1991-09-03
- Granted: 1994-09-20
- Earliest claimed: 1991-09-03
- Assignees: Minnesota Mining and Manufacturing Company
- Inventors: David R. Boston
- Web page: https://patentgrep.com/patent/US5348799A

## CPC

- G03C 1/89: Macromolecular substances therefor
- C09D 105/08: Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
- C09K 3/16: Anti-static materials
- G03C 1/853: {Inorganic compounds, e.g. metals}
- Y10T 428/25: Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T 428/256: Heavy metal or aluminum or compound thereof
- Y10T 428/259: Silicic material
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A reduction of static buildup on surfaces can be accomplished by providing a coating which is the dried and reacted product of an aqueous composition of chitosan salt and inorganic metal oxide sol. A stable, static reducing coating on polymeric substrates is particularly useful in photographic media.

## Claims

### Claim 1

An organic polymeric substrate having an antistatic protective coating thereon, said coating comprising an optically transparent layer of chitosan acid salt and anionic inorganic metal oxide colloidal particles.

### Claim 2 (depends on 1)

The substrate of claim 1 wherein said organic polymeric substrate is polyethylenetetephthalate in the form of a sheet or film and said antistatic coating has a thickness of from 25-2000 nm.

### Claim 3 (depends on 2)

The substrate having an antistatic coating thereon according to claim 2 wherein said chitosan acid salt has been alkylated.

### Claim 4 (depends on 3)

The substrate of claim 3 wherein said chitosan acid salt has been methylated or ethylated.

### Claim 5 (depends on 4)

The substrate having an antistatic coating thereon according to claim 4 wherein said inorganic metal oxide colloidal particles comprise silica, titania, stannic oxide or mixtures thereof.

### Claim 6 (depends on 3)

The substrate having an antistatic coating thereon according to claim 3 wherein said inorganic metal oxide colloidal particles comprise silica, titania, stannic oxide or mixtures thereof.

### Claim 7 (depends on 2)

The substrate having an antistatic coating thereon according to claim 2 wherein said inorganic metal oxide colloidal particles comprise silica, titania, stannic oxide or mixtures thereof.

### Claim 8 (depends on 1)

The substrate having an antistatic coating thereon according to claim 1 wherein said inorganic metal oxide colloidal particles comprise silica, titania, stannic oxide or mixtures thereof.

### Claim 9

An organic polymeric film having on at least one surface thereof an optically transparent antistatic protection layer of 50 to 1200 nm thickness comprising 1 to 65% by weight solids in said layer of a chitosan acid salt and 99 to 35% by weight solids in said layer of anionic inorganic metal oxide colloidal particles.

### Claim 10 (depends on 9)

The film of claim 9 wherein both sides of said film have said antistatic protection layer thereon.