C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/2019, 18/60
C08G 75/02 (2006.01) H01B 3/30 (2006.01) H01L 21/56 (2006.01) H05K 1/03 (2006.01) H05K 1/05 (2006.01)
Patent
CA 1260174
ABSTRACT OF THE DISCLOSURE A para-phenylene sulfide block copolymer consist- ing essentially of a recurring unit (A) Image and a recurring unit (B) Image , said recurring units (A) being present in the form of a block of 20 to 5,000 units of (A) on the average in the molecular chain, the mol fraction of the recurring units (A) be- ing in the range of 0.50 to 0.98, the block copolymer having a melt viscosity (n* ) of 50 to 100,000 poise as determined at 310°C at a shear rate of 200 sec-1 and having: (a) a glass transition temperature (Tg) of 20 to 80°C, (b) a crystalline melting point (Tm) of 250 to 285°C, and (c) a crystallization index (Ci) of 15 to 45, this value being that of the heat-treated, but not stretch-oriented copolymer, which block copolymer is preferably produced by a process comprising a first step of heating an aprotic polar organic solvent con- taining a dihaloaromatic compound consisting essential- ly of a m-dihalobenzene and an alkali metal sulfide to form a reaction liquid (E) containing a m-phenylene sulfide polymer consisting essentially of recurring units (B) Image and a second step of adding a p- dihalobenzen to the reaction liquid (E) and heating the mixture in the presence of an alkali metal sulfide and an aprotic polar organic solvent to form a block copolymer consisting essentially of the recurring units (B) and recurring units (A) Image .
485040
Iizuka Yo
Iwasaki Takao
Katto Takayuki
Kouyama Toshitaka
Shiiki Zenya
Fetherstonhaugh & Co.
Kureha Kagaku Kogyo Kabushiki Kaisha
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