Polyphenylene ether compositions with improved die lip buildup performance
View Patent ↗A process for reducing lip buildup during an extrusion of a polyphenylene ether composition comprises adding a linear low density polyethylene compound to the composition, wherein the amount of linear low density polyethylene compound is less than or equal to about 10 percent by weight based on the amount of polyphenylene ether compound in the composition.
1. A method for reducing die lip buildup during extrusion of a polyphenylene ether composition, the method comprising:
extruding a composition comprising a polyphenylene ether resin and a linear low density polyethylene in an amount greater than or equal to about 1 to less than or equal to about 10 parts by weight for every 100 parts by weight of the polyphenylene ether resin to obtain an extrudate of the polyphenylene ether resin composition, wherein lip build up is reduced relative to polyphenylene ether compositions free of the linear low density polyethylene.
2. The method as claimed in claim 1 wherein the polyphenylene ether has an intrinsic viscosity of about 0.33 deciliters/gram to about 0.46 deciliters/gram as measured in chloroform at 25° C.
3. The method as claimed in claim 1 , wherein the linear low density polyethylene has a melt flow index less than about 40 grams per 10 minutes as measured in accordance with ASTM D-1238.
4. The method as claimed in claim 1 , wherein the composition further comprises a high impact polystyrene compound.
5. The method as claimed in claim 1 , wherein the composition further comprises effective amounts of at least one additive selected from the group consisting of flame retardants, drip retardants, dyes, pigments, flow enhancers, impact modifiers, colorants, reinforcing agents, fillers, glass fibers, stabilizers, antistatic agents, plasticizers, and lubricants.
6. The method as claimed in claim 1 , wherein the linear low density polyethylene has a melting point of about 100° C. to about 136° C.
7. The method as claimed in claim 1 , wherein the polyphenylene ether resins comprises a formula:
wherein each Q 1 or Q 2 is independently hydrogen, halogen, C1 to C7 primary or secondary alkyl, aryl, halohydrocarbon groups having at least two carbons between the halogen atoms and the phenyl nucleus, aminoalkyl, hydrocarbonoxy or halohydrocarbonoxy wherein at least two carbon atoms separate the halogen and oxygen atoms and at least two carbon atoms separate the halogen atoms and the phenyl nucleus.
8. The method as claimed in claim 1 , wherein the composition further comprises a vinyl aromatic resin, a polyamide, a polyarylene sulfide, a polyphthalamide, a polyetheramide, or a polyester.
9. A method for reducing die lip buildup during extrusion of a polyphenylene ether composition, the method comprising:
extruding a composition comprising a polyphenylene ether resin, a linear low density polyethylene in an amount greater than or equal to about 1 to less than or equal to about 10 parts by weight for every 100 parts by weight of the polyphenylene ether resin in the composition and a high impact polystyrene compound in an amount of about 1 to about 40 parts by weight of the composition to obtain an extrudate of the polyphenylene ether resin composition, wherein lip build up is reduced relative to polyphenylene ether compositions free of the linear low density polyethylene.
10. The method as claimed in claim 9 , wherein the composition further comprises a vinyl aromatic resin, a polyamide, a polyarylene sulfide, a polyphthalamide, a polyetheramide, or a polyester.
11. The method as claimed in claim 9 , wherein the linear low density polyethylene has a density of about 0.88 to about 0.96 grams per cubic centimeter.
12. The method as claimed in claim 9 , wherein the linear low density polyethylene has a melt flow index less than about 40 grams per 10 minutes as measured in accordance with ASTM D-1238.
13. The method as claimed in claim 9 , wherein the composition further comprises a high impact polystyrene compound.
14. The method as claimed in claim 9 , wherein the composition further comprises effective amounts of at least one additive selected from the group consisting of flame retardants, drip retardants, dyes, pigments, flow enhancers, impact modifiers, colorants, reinforcing agents, fillers, glass fibers, stabilizers, antistatic agents, plasticizers, and lubricants.
15. The method as claimed in claim 9 , wherein the polyphenylene ether has an intrinsic viscosity of about 0.33 deciliters/gram to about 0.46 deciliters/gram as measured in chloroform at 25° C.
16. The method as claimed in claim 9 , wherein the linear low density polyethylene has a melting point of about 100° C. to about 136° C.