Poly(arylene ether) compression molding
View Patent ↗A method for compression molding of poly(arylene ether) powder comprises introducing a powder comprising unheated poly(arylene ether) powder to compaction equipment comprising a compression mold and subjecting the powder in the compression mold to a pressure sufficient to produce an article having a density greater than the unheated poly(arylene ether) powder wherein the pressure is applied at a temperature less than the glass transition temperature of the poly(arylene ether) powder.
1. A method for compression molding of poly(arylene ether) powder, comprising:
introducing a powder consisting of unheated poly(arylene ether) powder and an optional component selected from the group consisting of a binder, a flame retardant, an additive, a modifying agent or a combination of two or more of the foregoing to compaction equipment comprising a compression mold; and
subjecting the powder in the compression mold to a pressure of 1 to 50 tons per square centimeter to produce an article having a density greater than the unheated poly(arylene ether) powder and a compressive strength of about 100 to about 3000 kilograms, wherein said pressure is applied at a temperature of 0 to 70° C. and said pressure is applied for 0.1 to 100 seconds
wherein the additive is selected from the group consisting of antioxidants, mold release agents, ultra violet absorbers, stabilizers, lubricants, plasticizers, pigments, dyes, colorants, antistatic agents, blowing agents, and mixtures thereof and the modifying agent comprises one or more polar groups.
2. The method of claim 1 wherein the temperature is 0 to about 60° C.
3. The method of claim 1 , wherein the poly(arylene ether) powder has an average particle size of about 50 to 1500 micrometers.
4. The method of claim 1 , wherein the poly(arylene ether) powder comprises about 15 to 60 volume percent of particles having a particle size less than about 100 micrometers, based on the total volume of poly(arylene ether).
5. The method of claim 1 wherein the poly(arylene ether) is processed to remove or reduce gas trapped between the particles.
6. The method of claim 1 , wherein the binder is crystalline and has a melt temperature less than the glass transition temperature of the poly(arylene ether) powder.
7. The method of claim 1 , wherein the binder is amorphous and has a glass transition temperature less than the glass transition temperature of the poly(arylene ether) powder.
8. The method of claim 1 , wherein the binder is a reactive binder.
9. The method of claim 1 , wherein the binder is a non-reactive binder.
10. The method of claim 1 , wherein the binder is present in an amount of about 0.01 to about 40 weight percent, based on the total weight of the mixture.
11. The method of claim 1 , wherein the compression mold is unheated upon introduction of the powder.
12. The method of claim 1 , wherein the compression mold is heated after introduction of the powder.
13. The method of claim 12 , wherein the compression mold is not heated during compressing.
14. The method of claim 1 , wherein the compression mold is heated prior to introduction of the powder.
15. The method of claim 14 , wherein the compression mold is heated after introduction of the powder.
16. The method of claim 14 , wherein the compression mold is not heated during the application of pressure.
17. The method of claim 1 , wherein the compression mold is a die of an extruder.
18. The method of claim 1 , wherein the article is a single phase compact.
19. The method of claim 1 , wherein the article is a multi phase compact.