US4313870A
Expired / Lapsed
US
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Process for producing polycondensates
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1978-09-05
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Granted: 1982-02-02
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Expires: 1998-09-05
Abstract
Abstract In a method producing a polycondensate by bulk polycondensation of a monomer (or a reactant mixture) which is a fluid at the polycondensation temperature, an improvement which comprises carrying out the polycondensation until substantially the whole polycondensate becomes a solid polydispersion while continually applying a shearing force sufficient for maintaining the polycondensation system in polydispersed state at a temperature of below the sintering of the produced polycondensate but sufficiently high for allowing the polycondensation to proceed substantially.
Inventors
- 👤 Shozaburo Imai
- 👤 Haruo Suzuki
- 👤 Kuniaki Asai
- 👤 Katsuji Ueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:59
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/18; C08G61/00; C08G61/02; C08G61/10; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C08G69/00; C08G69/02; C08G69/04; C08G73/10; C08G73/1003; C08G75/00; C08G75/20; C08G85/00; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/18; C08K3/20; C08K3/34; C08K3/40; C08K9/00; C08K9/04; C08K9/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
In a method for producing a polycondensate by a bulk polycondensation of a monomer (or a reactant mixture) which is a fluid at the polycondensation temperature, an improvement which comprises carrying out the polycondensation until substantially the whole polycondensate becomes a solid polydispersion while continually applying a shearing force sufficient for maintaining the polycondensation system in polydispersed state at a temperature below the sintering temperature of the produced polycondensate but sufficiently high for allowing the polycondensation to proceed substantially.
Claim 2
Dependent Claim
79 words
In a method for producing a polycondensate by a bulk polycondensation of a monomer (or a reactant mixture) which is a fluid at the polycondensation temperature, an improvement which comprises carrying out the polycondensation until substantially the whole polycondensate becomes a solid polydispersion while continually applying a shearing force sufficient for maintaining the polycondensation system in polydispersed state at a temperature below the sintering temperature of the produced polycondensate but sufficiently high for allowing the polycondensation to proceed substantially.
Claim 3
Dependent Claim
32 words
A method according to claim 1, wherein the polycondensate is one member selected from the group consisting of polyamides, polyamide-imides, polyimides, polyesters, polyester-amides, polycarbonates, polyoxazoles, polyamine hydrazides, polybenzimidazoles, polyphenylenes, polysulfones, and polysulfides.
Claim 4
Dependent Claim
81 words
A method according to claim 2, wherein the polyester is an aromatic polyester represented by the general formula ##STR3## wherein X is a hydrocarbon group having 1 to 20 carbon atoms, --O--, --SO 2 --, --S--, or --CO--, m is 0 or 1, 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, and r are positive integers and q=r.
Claim 5
Dependent Claim
132 words
A method according to claim 3, wherein the aromatic polyester is a polyester obtained by the polycondensation of the monomer (II), a mixture of the monomers (III) and (IV), or a mixture of the monomers (II), (III) and (IV): ##STR4## wherein each of R 1 , R 5 and R 6 is a benzoyl group, lower alkanoyl group, or hydrogen atom; each of R 2 , R 3 and R 4 is a hydrogen atom, benzyl group, lower alkyl group, or phenyl group; X is a hydrocarbon group having 1 to 20 carbon atoms, --O--, --SO 2 --, --S--, or --CO--; m is 0 or 1 and n is 0 or 1, wherein said monomers (III) may also be a member selected from the group consisting of terephthaloyl chloride and isophthaloyl chloride.
Claim 6
Dependent Claim
20 words
A method according to claim 1, wherein the polycondensation is carried out at a temperature of 0° to 400° C.
Claim 7
Dependent Claim
20 words
A method according to claim 5, wherein the polycondensation is carried out at a temperature of 180° to 400° C.
Claim 8
Dependent Claim
26 words
A method according to claim 1, wherein the shearing force applied to the polycondensation system is produced by the agitation power of 0.75-100 KW/m 3 .
Claim 9
Dependent Claim
18 words
A method according to claim 1, wherein the polycondensation is carried out in the presence of a filler.
Claim 10
Dependent Claim
42 words
A method according to claim 8, wherein the filler is at least one member selected from the group consisting of silica, quartz, fumed silica, silicon carbide, aluminum oxide, tin oxide, iron oxide, zinc oxide, carbon, and graphite powder, sand, and glass fiber.
Claim 11
Dependent Claim
17 words
A method according to claim 4, wherein the polycondensed monomers are p-hydroxybenzoic acid, isophthalic acid, and p,p'-bisphenol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |