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AssigneeDainippon Ink and Chemicals, Inc.
InventorsJuheiji Kawabata, Toshinori Sugie, Fumihiro Kobata, Hitoshi Izutsu, Manabu Chiba
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A block copolymer composed of polyphenylene sulfide segments and aromatic sulfide sulfone polymer segments and having a logarithmic viscosity [.eta.], determined at 206.degree. C. for its solution in alpha-chloronaphthalene in a polymer concentration of 0.4 g/100 ml of solution and calculated in accordance with the equation [.eta.]=ln (relative viscosity)/polymer concentration, of 0.03 to 1.0. A resin composition comprising the block copolymer and polyphenylene sulfide and/or an aromatic sulfide sulfone polymer and optionally a filler. The block copolymer and the resin composition have improved mechanical strength and are suitable, for example, for encapsulation of electronic component parts.
A block copolymer composed of polyphenylene sulfide segments and aromatic sulfide sulfone polymer segments and having a logarithmic viscosity [.eta.] of 0.03 to 1.0, said logarithmic viscosity [.eta.] being determined at 206.degree. C. for its solution in alpha-chloronaphthalene in a polymer concentration of 0.4 g/100 ml of solution and calculated in accordance with the equation [.eta.]=ln (relative viscosity)/polymer concentration.
Dependencies are inferred from the claim text.