Processing

Please wait...

Settings

Settings

Goto Application

1. WO2020194076 - EPOXIDE MICROCAPSULES WITH PICKERING EMULSIFIERS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

We claim:

1. Particles of encapsulated first epoxy resin comprising

a) a core of first epoxy resin, within

b) a shell comprising an organic polymer, and

c) a layer of oil-in-water Pickering emulsifier particles borne on an outer surface of the shell.

2. The particles according to claim 1 comprising not more than 50 wt%, based on the weight of oil-in-water Pickering emulsifier particles, of an organic polymeric surfactant.

3. The particles according to claim 1 comprising not more than 10 wt%, based on the weight of oil-in-water Pickering emulsifier particles, of an organic polymeric surfactant.

4. The particles according to any of claims 1-3 having an average diameter of 0.1-1000 micrometers.

5. The particles according to any of claims 1-4 wherein the shell comprises an organic polymer selected from the group consisting of polyurea, polyurethane, polymethylene urea, cured epoxy resin, and combinations thereof.

6. The particles according to any of claims 1-4 wherein the shell comprises a polyurea polymer.

7. The particles according to any of claims 1-6 wherein the oil-in-water Pickering emulsifier particles comprise materials selected from the group consisting of silica, fumed silica, calcium carbonate, barium sulfate, clay, carbon black, iron oxide, carbon nanotubes, latex, block copolymer micelles, polystyrene, poly(methyl methacrylate), any of the preceding materials which additionally are surface-modified, and

combinations thereof.

8. The particles according to any of claims 1-6 wherein the oil-in-water Pickering emulsifier particles comprise fumed silica surface-modified with organic silanes or organic siloxanes.

9. The particles according to any of claims 1-7 wherein the oil-in-water Pickering emulsifier particles have an outer surface, wherein the outer surface exhibits a contact angle with water of 50-95°.

10. The particles according to any of claims 1-7 wherein the oil-in-water Pickering emulsifier particles have an outer surface, wherein the outer surface exhibits a contact angle with water of 60-90°.

11. The particles according to any of claims 1-10 wherein the oil-in-water Pickering emulsifier particles have an average diameter of 5-1000 nanometers.

12. The particles according to any of claims 1-11 which activate upon heating to a activation temperature, wherein the activation temperature is not more than 170 °C.

13. A composition comprising:

A) the particles according to any of claims 1-12, blended with

B) a first epoxy curative.

14. The composition according to claim 13 wherein the first epoxy curative is an adduct of a second epoxy curative and a second epoxy resin in a ratio of at least 2: 1 second epoxy curative to second epoxy resin.

15. An adhesive comprising

I) particles of encapsulated first epoxy resin comprising

a) a core of first epoxy resin, within

b) a shell comprising an organic polymer, and

c) a layer of oil-in-water Pickering emulsifier particles borne on an outer surface of the shell;

blended with

II) a first epoxy curative;

wherein the adhesive is a liquid at normal temperature and pressure (NTP); and wherein the adhesive is a one-part structural adhesive.