# US 12,110,373 B2 · Non-hazardous water-based polyurethane dispersion

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- Number: US 12,110,373 B2
- Document ID: US12110373B2
- Status: Granted
- Kind: B2
- Application number: 17/082,143
- Filed: 2020-10-28
- Published: 2021-02-25
- Granted: 2024-10-08
- Earliest claimed: 2015-12-22
- Assignees: Sika Technology AG
- Applicants: Sika Technology AG
- Inventors: Craig Evans; Neil Carter; Ian Martin
- Web page: https://patentgrep.com/patent/US12110373B2

## CPC

- C08J 7/043: Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50)
- B05D 1/00: Processes for applying liquids or other fluent materials (B05D5/00, B05D7/00 take precedence)
- C08G 18/0823: {containing carboxylate salt groups or groups forming them}
- C08G 18/0847: {in the presence of solvents for the polymers}
- C08G 18/0866: {the dispersing or dispersed phase being an aqueous medium}
- C08G 18/10: Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G 18/12: using two or more compounds having active hydrogen in the first polymerisation step
- C08G 18/246: {containing also tin-carbon bonds}
- C08G 18/3228: {acyclic}
- C08G 18/348: {Hydroxycarboxylic acids}
- C08G 18/44: Polycarbonates
- C08G 18/758: {containing two or more cycloaliphatic rings}
- C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)}
- C08J 7/046: Forming abrasion-resistant coatings; Forming surface-hardening coatings
- C09D 175/04: Polyurethanes
- C09D 175/12: from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group
- B05D 2401/20: Aqueous dispersion or solution
- B05D 2503/00: Polyurethanes
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- 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)

## Abstract

Water-based polyurethane dispersion methodology relating to a chain-extended polyurethane, characterized in that the polyurethane dispersion includes 2, 5, 7, 10-tetraoxaundecane. The water-based polyurethane dispersion is suitable as a non-hazardous water-based coating composition for coatings with a particularly good adhesion on plastic or rubber substrates. The solvent 2, 5, 7, 10-tetraoxaundecane contained therein imparts good film coalescing, good adhesive properties and high strength of the polyurethane dispersion.

## Claims

### Claim 1

A method comprising:
introducing a coalescent comprising 2,5,7,10-tetraoxaundecane into a water-based polyurethane dispersion such that the 2,5,7,10-tetraoxaundecane is present in the water-based polyurethane dispersion in an amount of 10% to 40% by weight based on the total weight of a chain-extended polyurethane in the water-based polyurethane dispersion;
applying the water-based polyurethane dispersion to a surface of a plastic substrate or a rubber substrate to coat the plastic substrate or the rubber substrate such that a thickness of the coating is in the range of 50 microns to 3 mm, wherein the water-based polyurethane dispersion is applied to the plastic substrate or the rubber substrate at a temperature below 30° C.; and
forming a film at a temperature below 30° C. on the plastic substrate or the rubber substrate by evaporation of water of the applied water-based polyurethane dispersion,
wherein the water-based polyurethane dispersion is a rigid polyurethane dispersion, and
wherein the rigid polyurethane dispersion is based on an isocyanate-terminated polyurethane prepolymer that is a reaction product of: (i) a polyester polyol and/or a polycarbonate polyol, (ii) dimethylol propionic acid (DMPA), and (iii) bis(4-isocyanatocyclohexyl) methane, and is chain extended by a polyamine.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the plastic substrate or the rubber substrate is a substrate selected from the group consisting of a PVC substrate and polycarbonate substrate.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the plastic substrate or the rubber substrate is selected from PVC substrates that are in the form of a plate, a sheet, a fibre, a cable or a textile.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the plastic substrate or the rubber substrate is selected from polycarbonate substrates that are in the form of a plate, a sheet, a fibre, a cable or a textile.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the film has an ultimate tensile strength of about 25.2 MPa.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the film is a rigid, elastic film.