Appeal No. 1996-1372
Application No. 08/003,659
According to Shibuya, polyolefins (e.g., polypropylene) are inexpensive, have excellent molding
properties, toughness, resistance to water, organic solvents and chemicals, and low specific viscosity
but have insufficient heat resistance; whereas, polyphenylene ether resins have excellent heat resistance
but unsatisfactory molding properties and solvent resistance (page 2, lines 10-19). Therefore, blends of
polyolefins and polyethylene ether resins have been proposed which compensate for the respective
disadvantages while retaining the respective advantages inherent in each (page 2, lines 20-47). Shibuya
discloses a resin blend which “exhibits well-balanced mechanical strength properties, solvent
resistance, and molding properties at relatively high levels” (page 2, lines 49-50) obtained “by
compounding a hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated
diene having properties of specific ranges with a combination of a polyphenylene ether resin and a
crystalline polyolefin” (page 2, lines 53-57). Shibuya’s blended resin composition comprises (a) from
20 to 80%, most preferably from 33 to 55%, by weight of a polyolefin, preferably a crystalline
polypropylene resin, (b) from 20 to 80%, most preferably 35 to 53%, by weight of a polyphenylene
ether resin, (c) from 4 to 50%, most preferably from 10 to 20%, by weight of a hydrogenated alkenyl
aromatic compound/conjugated diene block copolymer and, optionally, (d) from 0.05 to 30 parts, most
preferably from 2 to 15 parts, by weight of the total amount of the components (a), (b) and (c), a
diamide compound of formula
R -NHCO-R -CONH-R11 10 12 (D-1),
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Last modified: November 3, 2007