Inductively curable composition

Patent metadata

Field	Value
Publication number	US-10011699-B2
Application number	US-201515324738-A
Country	US
Kind code	B2
Filing date	Aug 18, 2015
Priority date	Aug 29, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

An inductively curable thermoset compositions comprising a thermoset resin and, dispersed therein, susceptor particles and surface modified silica particles is described.

First claim

The invention claimed is:

1. An inductively curable composition comprising:
a) a thermoset resin;
b) ferromagnetic susceptor particles having an average particle size of less than 500 nanometers;
c) surface-modified inorganic nanoparticles;
wherein the ferromagnetic susceptor particles b) are present in amounts of 0.1 to 50 parts by weight; and
wherein the surface-modified inorganic nanoparticles are present in amounts of 1 to 150 parts by weight, relative to 100 parts by weight of the thermoset resin, and wherein the ferromagnetic susceptor particles are surface-modified by an agent of the formula A-Z-B dispersants wherein A is derived from a non-ionic surface active agent, B is an organic acid group which anchors the dispersing agent to the ferromagnetic susceptor particles, and Z is a connecting group linking A to B wherein Z comprises at least one carbon atom.

2. The inductively curable composition of claim 1 comprising 1 to 25 parts by weight of the ferromagnetic susceptor particles.

3. The inductively curable composition of claim 1 wherein the ferromagnetic susceptor particles are less than 250 nm average diameter.

4. The inductively curable composition of claim 1 wherein the ferromagnetic susceptor particles are 100 to 250 nm average diameter.

5. The inductively curable composition of claim 1 wherein the ferromagnetic susceptor particles are Fe 3 O 4 particles.

6. The inductively curable composition of claim 1 wherein the thermoset resin is selected from the group consisting of epoxy resins, vinyl ester resins, maleimide resins, and polycyanate ester resins.

7. The inductively curable composition of claim 1 further comprising reinforcing fibers.

8. The inductively curable composition of claim 7 comprising 10 to about 80 volume percent of reinforcing fibers.

9. The inductively curable composition of claim 1 wherein the surface modified inorganic nanoparticles are surface modified silica nanoparticles.

10. The inductively curable composition of claim 9 wherein the surface modified silica nanoparticles are modified by silane with alkyl, phenyl, amine or epoxy groups.

11. The inductively curable composition of claim 1 wherein the surface modified inorganic nanoparticles are surface modified calcium carbonate nanoparticles.

12. The inductively curable composition of claim 11 wherein the calcium carbonate nanoparticles are modified by a surface modifier with sulfate, phosphate, or carboxylate groups.

13. The inductively curable composition of claim 1 wherein the surface modified nanoparticles are used in amounts of 1 to 50 parts by weight, relative to 100 parts by weight of thermoset resin.

Assignees

• 3M Innovative Properties Co

Inventors

• Wu Jung-Sheng
• Zu Lijun
• Parkar Zeba

Classifications

• C08K7/02

  Fibres or whiskers · CPC title

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08J2363/02

  Polyglycidyl ethers of bis-phenols · CPC title

• C08J3/247

  Heating methods · CPC title

• C08K2201/011

  Nanostructured additives · CPC title