| 摘要 |
Disclosed is an aromatic copolymer comprising a plurality of aromatic copolymer chains, each comprising (A) recurring 2,6-diphenylphenol units and (B) phenolic comonomer units, each comonomer unit being independently selected from the group consisting of (i) an oxyphenylene monomer unit which is monosubstituted with a monovalent aromatic group or a halogen atom, (ii) an alpha-oxynaphthylene monomer unit, (iii) a beta-oxynaphthylene monomer unit, and (iv) an oxyphenylene monomer unit which is substituted with at least one aliphatic group, wherein the amounts of (A) and (B) are from 50 to 98% by weight and from 2 to 50% by weight, based on the weight of the aromatic copolymer, provided that, when (iv) is present as the comonomer unit, the amount of (iv) is 20% by weight or less, based on the weight of (B), and wherein the aromatic copolymer has a weight average molecular weight of from 1,000 to 3,000,000. A method for producing the aromatic copolymer is also disclosed. The aromatic copolymer of the present invention has excellent electrical characteristics (such as a low dielectric constant), an excellent heat resistance, excellent film-forming properties, low water absorption properties and an excellent adhesion to other materials, and can be advantageously used as a material for various electronic parts.
|
