Capped poly(arylene ether) composition and method
View Patent ↗A method of preparing a capped poly(arylene ether) resin includes reacting a capping agent with a blend of two or more poly(arylene ether) resins having different intrinsic viscosities. Cured compositions prepared from these capped poly(arylene ether) resins exhibit improved balances of stiffness, toughness, and dielectric properties compared to compositions with two or more separately capped and isolated poly(arylene ether) resins.
1. A method of preparing a capped poly(arylene ether) resin, comprising:
reacting a capping agent with a blend of a first poly(arylene ether) resin and a second poly(arylene ether) resin; wherein the first poly(arylene ether) resin and the second poly(arylene ether) resin have intrinsic viscosities differing by at least 0.1 deciliters per gram, measured at 25° C. in chloroform; and wherein the capping agent is selected from the group consisting of acetic anhydride, propionic anhydride, isobutyric anhydride, acrylic anhydride, methacrylic anhydride, glycidyl acrylate, glycidyl methacrylate, acetyl chloride, benzoyl chloride, diphenyl carbonates, di(4-nitrophenyl)carbonate, acryloyl esters, methacryloyl esters, acetyl esters, phenylisocyanate, 3-isopropenyl-α,α-dimethylphenylisocyanate, cyanatobenzene, 2,2-bis(4-cyanatophenyl)propane, 3-(α-chloromethyl)styrene, 4-(α-chloromethyl)styrene, allyl bromide, and mixtures thereof.
2. The method of claim 1 , wherein the capped poly(arylene ether) resin has an intrinsic viscosity of about 0.15 to about 0.45 deciliters per gram.
3. The method of claim 1 , wherein the first poly(arylene ether) resin has an intrinsic viscosity of about 0.05 to less than 0.20 deciliters per gram.
4. The method of claim 1 , wherein the second poly(arylene ether) resin has an intrinsic viscosity of at least 0.20 to about 0.60 deciliters per gram.
5. The method of claim 1 , wherein the first and second poly(arylene ether) resins each consisting essentially of the polymerization product of at least one monohydric phenol having the structure
wherein R 1 and R 3 are each independently hydrogen, halogen, primary or secondary C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, C 1 -C 12 aminoalkyl, C 1 -C 12 hydroxyalkyl, phenyl, C 1 -C 12 haloalkyl, C 1 -C 12 hydrocarbyloxy, or C 2 -C 12 halohydrocarbyloxy wherein at least two carbon atoms separate the halogen and oxygen atoms; R 2 and R 4 are each independently halogen, primary or secondary C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, C 1 -C 12 aminoalkyl, C 1 -C 12 hydroxyalkyl, phenyl, C 1 -C 12 haloalkyl, C 1 -C 12 hydrocarbyloxy, or C 2 -C 12 halohydrocarbyloxy wherein at least two carbon atoms separate the halogen and oxygen atoms.
6. The method of claim 1 , wherein the capped poly(arylene ether) comprises at least one capping group having the structure
wherein R 6 is hydrogen or methyl, and R 7 and R 8 are hydrogen.
7. The method of claim 1 , wherein the capping agent is selected from acetic anhydride, methacrylic anhydride, acrylic anhydride, propionic anhydride, isobutyric anhydride, and combinations thereof.