US4017463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High melting N,N-terephthaloyl bis-phthalimide and its use as an ester interlinking agent for polyesters
Assignee: Shell USA Inc
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Filing: 1975-07-21
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Granted: 1977-04-12
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Expires: 1995-07-21
Abstract
Abstract There is disclosed, as a composition of matter, a new, high melting N,N'-terephthaloyl bis-phthalimide, a method for its preparation employing as a solvent a high boiling aromatic or aliphatic-aromatic ether or a mixture of a high boiling aromatic or aliphatic-aromatic ether and a low boiling cyclic or aliphatic ether and the use of said new, high melting N,N'-terephthaloyl bis phthalimide as an ester interlinking agent for polyester.
Inventors
- 👤 Yuzi Okuzumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:46
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C08; C08G; C08G63/00; C08G63/91; C08G63/914; C08G63/916
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
In a process for preparing high molecular weight linear polyesters of an aromatic dicarboxylic acid selected from the group consisting of terephthalic acid, isophthalic acid, 2,6-naphthoic acid, 2,7-naphthlic acid and p,p'-diphenyl dicarboxylic acid and copolyesters of at least one of said acids and a second acid by melt polymerizing the reaction product of the esterification or transesterification of the dicarboxylic acid or lower alkyl ester thereof with a glycol of the series HO(CH 2 ) n OH where n is an integer ranging from 2 to 10 the improvement which comprises adding to the polymerizing product, when the intrinsic viscosity of said polymerizing product is at least 0.2, from 1.0 to 20.0 parts by weight of N,N'-terephthaloyl bis-phthalimide, having a melting point of at least 330° C., per 100 parts by weight of the dicarboxylic acid or lower alkyl ester thereof and reacting it with said polymerizing product to form a high molecular weight product.
Claim 2
Dependent Claim
155 words
In a process for preparing high molecular weight linear polyesters of an aromatic dicarboxylic acid selected from the group consisting of terephthalic acid, isophthalic acid, 2,6-naphthoic acid, 2,7-naphthlic acid and p,p'-diphenyl dicarboxylic acid and copolyesters of at least one of said acids and a second acid by melt polymerizing the reaction product of the esterification or transesterification of the dicarboxylic acid or lower alkyl ester thereof with a glycol of the series HO(CH 2 ) n OH where n is an integer ranging from 2 to 10 the improvement which comprises adding to the polymerizing product, when the intrinsic viscosity of said polymerizing product is at least 0.2, from 1.0 to 20.0 parts by weight of N,N'-terephthaloyl bis-phthalimide, having a melting point of at least 330° C., per 100 parts by weight of the dicarboxylic acid or lower alkyl ester thereof and reacting it with said polymerizing product to form a high molecular weight product.
Claim 3
Dependent Claim
25 words
The improvement of claim 1 wherein the N,N'-terephthaloyl bis-phthalimide is added to the polymerizing product of the transesterification reaction of dimethyl terephthalate with ethylene glycol.
Claim 4
Dependent Claim
67 words
In a process for preparing high molecular weight linear polyester and copolyesters having an intrinsic viscosity of at least 0.6 the improvement which comprises adding to a polyester or copolyester from 0.1 to 5.0 parts by weight of N,N-terephthaloyl bis-phthalimide, having a melting point of at least 330° C., per 100 parts by weight of said polyester or copolyester and reacting it with the polyester or copolyester.
Claim 5
Dependent Claim
67 words
In a process for preparing high molecular weight linear polyester and copolyesters having an intrinsic viscosity of at least 0.6 the improvement which comprises adding to a polyester or copolyester from 0.1 to 5.0 parts by weight of N,N-terephthaloyl bis-phthalimide, having a melting point of at least 330° C., per 100 parts by weight of said polyester or copolyester and reacting it with the polyester or copolyester.
Claim 6
Dependent Claim
11 words
The improvement of claim 3 wherein the polyester is poly(ethylene terephthalate).
Claim 7
Dependent Claim
88 words
In a process for preparing high molecular weight polyester and copolyester fibers from polyester and copolyester resins by melt extrusion of resins, having an intrinsic viscosity of at least 0.60 as measured in a 60/40 phenol/tetrachloroethane mixed solvent at 30° C. the improvement which comprises adding to a polyester or copolyester from 0.1 to 5.0 parts by weight of N,N'-terephthaloyl bis-phthalimide, having a melting point of at least 330° C., per 100 parts by weight of said polyester or copolyester and reacting it with the polyester or copolyester.
Claim 8
Dependent Claim
88 words
In a process for preparing high molecular weight polyester and copolyester fibers from polyester and copolyester resins by melt extrusion of resins, having an intrinsic viscosity of at least 0.60 as measured in a 60/40 phenol/tetrachloroethane mixed solvent at 30° C. the improvement which comprises adding to a polyester or copolyester from 0.1 to 5.0 parts by weight of N,N'-terephthaloyl bis-phthalimide, having a melting point of at least 330° C., per 100 parts by weight of said polyester or copolyester and reacting it with the polyester or copolyester.
Claim 9
Dependent Claim
12 words
The improvement of claim 5 wherein the polyester resin is poly(ethylene terephthalate).
References Cited (Backward Citations)
US2558675A
Cited
US2594145A
Cited
US3444141A
Cited
US3714125A
Cited
US3776882A
Cited
US3803099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |