公开(公告)号：JPH071447A

公开(公告)日：1995-01-06

申请号：JP14900593

申请日：1993-06-21

Applicant: TORAY INDUSTRIES

Inventor： ITO SHIN ,  KAMATA KATSUMA ,  YOSHIOKA KAZUKI

IPC: B29B9/06 ,  B29B9/12 ,  B29K67/00

Abstract: PURPOSE:To prevent the fusion of polyester pellets at the time of the supply to a drying process or a molding machine by forming at least one dent to the surface which is formed to each of the polyester pellets when the pellets are solidified from a molten state and roughening the surface of each of the pellets after solidification. CONSTITUTION:A surface 1 is formed when a strand of molten polyester is solidified and does not contain the cut surface 2 made by a cutter. A dent 3 is pref. a recessed part relatively shallow with respect to the area thereof like the crater on the surface of the moon and can be formed by cutting the strand of molten polyester extruded from die by a cutter in such a state that the surface of the strand is solidified but the interior thereof is in a molten state. The area of one dent is pref. about 1/30-1/5 the surface area of each of pellets. After the pellets are solidified, the surface of each of the pellets is roughened by stirring the pellets using a granule stirring device to apply shearing treatment to the surfaces thereof and the difference between the surface roughness Ra after surface roughening treatment and that before surface roughening treatment is pref. set to 0.4mum or more.

公开(公告)号：JPH0859810A

公开(公告)日：1996-03-05

申请号：JP19670394

申请日：1994-08-22

Applicant: TORAY INDUSTRIES

Inventor： ITO SHIN ,  KAMATA KATSUMA ,  YOSHIOKA KAZUKI

IPC: C08G63/91 ,  C08G63/78

Abstract: PURPOSE: To obtain a polyester lowered in the amt. of the terminal carboxyl groups of the polymer chain and hence improved in hydrolytic resistance at a low cost by additionally adding a specific amt. of a dihydroxy component after completion of an esterification reaction and effecting a polymn. reaction after a specific period of time in a specific temp. range. CONSTITUTION: After completion of an esterification reaction (e.g. an esterification reaction of terephthalic acid with 1,4-butanediol), 0.1-0.5mol, based on the dicarboxylic acid component, dihydroxy component is additionally added to an esterification reaction vessel. The resulting mixture is stirred or allowed to stand in a temp. range of the b.p. of the dihydroxy component to the m.p. of the resulting prepolymer far 3 to 60min. Thereafter, the mixture is transferred to a polymerizer, wherein a polymn. reaction thereof is effected. According to the foregoing procedure, a polyester lowered in the amt. of the terminal carboxyl groups of the polymer chain can be prepd. at a low cost without needing large-scale remodeling of existent production facilities. This palyester is expected to be improved in salid phase polymerizability, lowered in water absorption, and improved in hydrolytic resistance under heat and moisture.

公开(公告)号：JP2000198854A

公开(公告)日：2000-07-18

申请号：JP37376498

申请日：1998-12-28

Applicant: TORAY INDUSTRIES

Inventor： MIYAUCHI KUNIHIKO ,  KUREMATSU TOSHIO ,  YOSHIOKA KAZUKI

IPC: C08G63/60 ,  B01J19/18 ,  C08G63/78 ,  C08G85/00

Abstract: PROBLEM TO BE SOLVED: To provide a polymerizing apparatus of a liquid crystalline resin having an excellent productivity while preventing clogging of a condenser or a line with a sublimated material or a scattered material during a polymerization in the polymerization of a liquid crystalline resin and a continuous batch polymerization method. SOLUTION: This polymerizing apparatus is an apparatus for reduced pressure-polymerizing a liquid crystalline resin and has a reacting can 2 performing a polymerization of the liquid crystalline resin, a pressure reducing device 4 for reducing pressure in the reacting can 2 and a condenser 5 for condensing/scavenging a gas generated by the reaction between the reacting can 2 and the pressure reducing device 4, and a mechanism cleaning an inside of the condenser 5 with a liquid or a gas for removing a sublimated material or a scattered material attached to the inside of the condenser 5.

公开(公告)号：JPH10292051A

公开(公告)日：1998-11-04

申请号：JP10316897

申请日：1997-04-21

Applicant: TORAY INDUSTRIES

Inventor： ITO SHIN ,  KAMATA KATSUMA ,  YOSHIOKA KAZUKI

IPC: C08J3/12

Abstract: PROBLEM TO BE SOLVED: To prevent the fusion of polyester pellets in the molding step and improve their blocking resistance by setting the band half-value width at a specified wavelength in the Raman spectrum at the surface and central part of a polyester pellet to a specified value or lower. SOLUTION: The half-value width of a band of 1,730 cm in the Raman spectrum at the surface of this polyester pellet is 22 cm or lower and that in the central part is 18 cm or lower. The pellet may be cylindrical, elliptically cylindrical, squarely cylindrical, platy, or spherical and has the size of one side of about 0.7-12 mm. The pellets are produced by extruding a molten polyester through a circular or elliptical die, cooling the resultant strand at the glass transition point or higher for a sufficient time, and cutting the solidified strand with a cutter or by cutting the extruded strand still in the semimolten state with a cutter and subjecting the resultant pellets to shearing treatment under machanical impact.