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US4327205A Expired / Lapsed US ⏱️ 0.0 years remaining

Bulk Polycondensation process for producing aromatic polyesters

Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1981-01-14
•
Granted: 1982-04-27
•
Expires: 2001-01-14
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Abstract

Abstract A process for producing by bulk polycondensation an aromatic polyester of the formula, ##STR1## wherein X is a hydrocarbon radical having 1 to 20 carbon atoms, --O--, --SO 2 --, --S--, or --CO--, m is 0 or 1 and n is 0 or 1; when p=0, q=r=an integer of 3 to 600; when q=r=0, p=an integer of 3 to 600; when p≠0, q≠0 and r≠0, p+q+r=3 to 600; p, q, r are integers and q=r, which comprises using a horizontal jacketed reactor provided with one or two agitator shafts bearing impellers fixed thereto and carrying out the bulk polycondensation in said reactor while circulating a heat-transfer medium through the jacket, agitator shaft(s), and, if necessary, impellers to heat or cool the reaction system to obtain a particulate material having a weight-average particle size of 0.5 to 20 mm.

Inventors

  • 👤 Yasuyuki Kato
  • 👤 Haruo Suzuki
  • 👤 Masatsune Kondo
  • 👤 Hiroaki Sugimoto
  • 👤 Junichi Kimura
  • 👤 Zyunso Saito

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 12:59
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; C08G63/02; C08G63/60; C08G63/605

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 138 words
A process for producing by bulk polycondensation an aromatic polyester of the formula, ##STR4## wherein X is a hydrocarbon radical having 1 to 20 carbon atoms, --O--, --SO 2 --, --S--, or --CO--, m is 0 or 1 and n is 0 or 1; when p=0, q=r=an integer of 3 to 600; when q=r=0, p=an integer of 3 to 600; when p≠0, q≠0 and r≠0, p+q+r=3 to 600; p, q, r are integers and q=r, which comprises using a horizontal jacketed reactor provided with one or two agitator shafts bearing impellers fixed thereto and carrying out the bulk polycondensation in said reactor while circulating a heat-transfer medium through the jacket, agitator shaft(s), and, if necessary, impellers to heat or cool the reaction system to obtain a particulate material having a weight-average particle size of 0.5 to 20 mm.
Claim 2
Dependent Claim 138 words
A process for producing by bulk polycondensation an aromatic polyester of the formula, ##STR4## wherein X is a hydrocarbon radical having 1 to 20 carbon atoms, --O--, --SO 2 --, --S--, or --CO--, m is 0 or 1 and n is 0 or 1; when p=0, q=r=an integer of 3 to 600; when q=r=0, p=an integer of 3 to 600; when p≠0, q≠0 and r≠0, p+q+r=3 to 600; p, q, r are integers and q=r, which comprises using a horizontal jacketed reactor provided with one or two agitator shafts bearing impellers fixed thereto and carrying out the bulk polycondensation in said reactor while circulating a heat-transfer medium through the jacket, agitator shaft(s), and, if necessary, impellers to heat or cool the reaction system to obtain a particulate material having a weight-average particle size of 0.5 to 20 mm.
Claim 3
Dependent Claim 34 words
A process according to claim 1, wherein the polycondensation is carried out while keeping the agitation power requirement at 10 kg.m/sec or less per unit weight (kilogram) of the aromatic polyester which is obtained.

References Cited (Backward Citations)

US4107143A Cited
US4196276A Cited
GB2006239A Cited
US4287332A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-04-26 1985-10-26 1986-04-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-04-26 1989-10-26 1990-04-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-04-26 1993-10-26 1994-04-27 $7700.00 Window Closed / Lapsed

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