Toughened, curable epoxy compositions for high temperature applications

Patent metadata

Field	Value
Publication number	US-9701811-B2
Application number	US-201314423947-A
Country	US
Kind code	B2
Filing date	Oct 10, 2013
Priority date	Oct 17, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A composition comprising: (a) an epoxy resin composition comprising: (i) a first epoxy component comprising an epoxy resin having at least one oxazolidone ring structure; and (ii) a second epoxy component selected from the group consisting of a liquid epoxy resin, a divinylarene dioxide, and combinations thereof; (b) a core-shell rubber comprising a rubber particle core and a shell layer, and (c) a hardener, is disclosed.

First claim

The invention claimed is:

1. A composition consisting of:
(a) an epoxy resin composition comprising:
(i) a first epoxy component comprising an epoxy resin having at least one oxazolidone ring structure; and
(ii) a second epoxy component selected from the group consisting of a liquid epoxy resin, a divinylarene dioxide, and combinations thereof;

(b) a core-shell rubber comprising a rubber particle core and a shell layer, and
(c) a hardener.

2. A composition in accordance with claim 1 , wherein the first epoxy component is a reaction product of I) an epoxy resin and II) a polyisocyanate.

3. A composition in accordance with claim 2 , wherein the polyisocyanate is methylene diphenyl diisocyanate.

4. A composition in accordance with claim 1 wherein the epoxy resin composition (a) is present in an amount in the range of from 40 weight percent to 93 weight percent, the core-shell rubber (b) is present in an amount in the range of from 2 weight percent to 25 weight percent, and the hardener (c) is present in an amount in the range of from 5 weight percent to 58 weight percent, based on the total weight of the composition.

5. A composition in accordance with claim 1 , wherein the core shell rubber has a core selected from the group consisting of a butadiene core, a silicone core, a butadiene-styrene copolymer core, and combinations thereof.

6. A composition in accordance with claim 1 , wherein the core shell rubber has a shell selected from the group consisting of a methyl methacrylate shell, a styrene shell, and combinations thereof.

7. A composition in accordance with claim 1 , wherein the liquid epoxy resin is selected from the group consisting of bisphenol A, bisphenol F, cycloaliphatic epoxies, biphenol epoxy resins, N,N-Diglycidyl-4 glycidyloxyaniline, 4,4′-methylenebis(N,N-diglycidylaniline), and pentaerythritol tetraglycidyl ether.

8. A composition in accordance with claim 1 , wherein the divinylarene dioxide is divinylbenzene dioxide.

9. A process for preparing the composition of claim 1 comprising:
(a) dispersing the core shell rubber into a liquid epoxy resin to form a dispersion; and
(b) contacting the dispersion with an isocyanate to form an oxazolidone ring-containing solid epoxy resin.

10. A process in accordance with claim 9 wherein the contacting in step b) is performed in a reaction zone under reaction conditions.

11. A process in accordance with claim 9 comprising dispersing the core shell rubber into the isocyanate modified, oxazolidone ring-containing solid epoxy resin in a mixing apparatus.

12. A prepreg made from the composition of claim 1 .

13. A coating made from the composition of claim 1 .

14. A composite made from the composition of claim 1 .

15. An electrical laminate made from the composition of claim 1 .

16. An electronic adhesive made from the composition of claim 1 .

Assignees

• Blue Cube Ip Llc

Inventors

• Liang Yi L
• Banda Lameck
• Xie Rui

Classifications

• C08K5/41

  Compounds containing sulfur bound to oxygen · CPC title

• C08L63/00

  Compositions of epoxy resins; Compositions of derivatives of epoxy resins · CPC title

• C08K5/1539 Primary

  Cyclic anhydrides · CPC title

• C08L51/04

  grafted on to rubbers · CPC title