C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/2019, 117/61
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 1272534
ABSTRACT OF THE DISCLOSURE Disclosed is a phenylene sulfide block copolymer consist- ing essentially of a recurring unit (A) Image and a recurring unit (B) Image . The recurring units (A) are 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 recur- ring units (A) is in the range of 0.50 to 0.98. The block co- polymer has a melt viscosity (?*) of 50 to 100,000 poise as determined at 310°C at a shear rate of 200 sec-1 and has: (a) a glass transition temperature (Tg) of 20 to 80°C, (b) a crystal- line melting point (Tm) of 250 to 285°C, and (c) a crystalliza- tion index (Ci) of 15 to 45, this value being that of the heat- treated, but not stretch-oriented copolymer. Also disclosed is a process for producing the block copolymer comprising a first step of heating an aprotic polar organic solvent containing a m-dihalobenzene and an alkali metal sulfide to form a reaction liquid (E) containing a m-phenylene sulfide polymer of recurring units (B) Image and a second step of adding a p-dihalo- benzene 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 of the recurring units (B) and recurring units (A) Image The phenylene sulfide block copolymer may be used for producing molded articles, films, filaments, printed circuit boards etc.
601684
Iizuka Yo
Iwasaki Takao
Katto Takayuki
Kouyama Toshitaka
Shiiki Zenya
Fetherstonhaugh & Co.
Kureha Kagaku Kogyo Kabushiki Kaisha
LandOfFree
Para-phenylene sulfide block copolymers, process for the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Para-phenylene sulfide block copolymers, process for the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Para-phenylene sulfide block copolymers, process for the... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1186706