US4113704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester filament-forming polymer and its method of production
Assignee: Monsanto Co
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Filing: 1976-06-24
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Granted: 1978-09-12
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Expires: 1996-06-24
Abstract
Abstract Significantly higher productivity of polyester feed yarn is achieved when the polymer from which the feed yarn is melt spun is chain-branched with multifunctional chain branches having 1-15 microequivalents of reactive branching sites based on one gram of the polymer. This productivity increase (over conventional production employing the same spinnerette in accordance with teachings of the prior art as applied generally to unbranched polymers) may be achieved specifically by spinning a feed yarn (of the same filament denier and draw ratio) at a higher throughput rate at a higher windup speed followed by draw-texturing (at the same draw ratio to the same drawn denier); or by spinning at a higher throughput rate employing the same windup speed a feed yarn of higher denier and draw-ratio followed by draw-texturing at the higher draw ratio to the same drawn denier; or by any combination thereof.
Inventors
- 👤 Donald L. MacLean
- 👤 Robert T. Estes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:04
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/78; D01F6/84; C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; C08G63/68; C08G63/685; C08G63/6854; C08G63/6856; D01F6/82
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
50 words
A polyester filament-forming copolymer suitable for high throughout melt spinning and comprising a polyester polymer and a chain branching agent, the copolymer being chain branched with the chain branching agent to the extent provided by 1-10 microequivalents of available chain branching reactive sites based on one gram of the copolymer.
Claim 2
Dependent Claim
50 words
A polyester filament-forming copolymer suitable for high throughout melt spinning and comprising a polyester polymer and a chain branching agent, the copolymer being chain branched with the chain branching agent to the extent provided by 1-10 microequivalents of available chain branching reactive sites based on one gram of the copolymer.
Claim 3
Dependent Claim
27 words
The polyester filament-forming copolymer of claim 1 chain branched to the extent provided by 2-10 microequivalents of available reactive sites, based on one gram of the copolymer.
Claim 4
Dependent Claim
27 words
The polyester filament-forming copolymer of claim 1 chain branched to the extent provided by 5-10 microequivalents, based on one gram of the copolymer, of available reactive sites.
Claim 5
Dependent Claim
28 words
The polyester filament-forming copolymer of claim 1, chain branched to the extent provided by about 10 microequivalents based on one gram of the copolymer of available reactive sites.
Claim 6
Dependent Claim
12 words
The copolymer of claim 1 wherein the chain branching agent is pentaerythritol.
Claim 7
Dependent Claim
13 words
The copolymer of claim 1 wherein the chain branching agent is trimer acid.
Claim 8
Dependent Claim
13 words
The copolymer of claim 1 wherein the chain branching agent is trimethylol propane.
Claim 9
Dependent Claim
13 words
The copolymer of claim 1 wherein the chain branching agent is mellitic acid.
Claim 10
Dependent Claim
14 words
The copolymer of claim 1 further including not more than 5% hydantoin containing units.
Claim 11
Dependent Claim
17 words
The copolymer of claim 9 wherein the hydantoin containing units include a compound having the structure: ##STR4##
Claim 12
Dependent Claim
120 words
In the process wherein esters of a dicarboxylic acid and a glycol are polymerized to form a high molecular weight polyester polymer having an intrinsic viscosity of 0.75-0.52 and then melt spun into filaments and taken up at speeds of 2000-6000 ypm (1828-5484 mpm) with controlled cooling between spinning and takeup, and thereafter orientation drawn at about the draw ratio of the filaments, the improvement comprising copolymerizing with said esters a chain branching agent in an amount as to provide 1-15 microequivalents of available chain branching reactive sites based on one gram of the copolymer whereby the draw ratio of the filaments in the drawing step is substantially increased over the draw ratio of a similarly spun unbranched polyester filament.
Claim 13
Dependent Claim
120 words
In the process wherein esters of a dicarboxylic acid and a glycol are polymerized to form a high molecular weight polyester polymer having an intrinsic viscosity of 0.75-0.52 and then melt spun into filaments and taken up at speeds of 2000-6000 ypm (1828-5484 mpm) with controlled cooling between spinning and takeup, and thereafter orientation drawn at about the draw ratio of the filaments, the improvement comprising copolymerizing with said esters a chain branching agent in an amount as to provide 1-15 microequivalents of available chain branching reactive sites based on one gram of the copolymer whereby the draw ratio of the filaments in the drawing step is substantially increased over the draw ratio of a similarly spun unbranched polyester filament.
Claim 14
Dependent Claim
34 words
The process improvement of claim 11 wherein a chain branching agent in an amount to provide 2-14 microequivalents, based on one gram of the polymer, of available reactive sites is copolymerized with said ester.
Claim 15
Dependent Claim
35 words
The process improvement of claim 11 wherein the chain branching agent in an amount as to provide 5-12 microequivalents, based on one gram of the polymer, of available reactive sites is copolymerized with said ester.
Claim 16
Dependent Claim
35 words
The process improvement of claim 11 wherein a chain branching agent in an amount to provide about 10 microequivalents, based on one gram of the polymer, of available reactive sites is copolymerized with the ester.
Claim 17
Dependent Claim
15 words
The process improvement of claim 11 wherein the takeup speed is 3,400-5,000 ypm (3107-4570 mpm).
Claim 18
Dependent Claim
15 words
The process improvement of claim 11 wherein the takeup speed is 3400 ypm (3107 mp).
Claim 19
Dependent Claim
15 words
The process improvement of claim 11 wherein the takeup speed is 3,400-3,600 ypm (3107-3290 mpm).
Claim 20
Dependent Claim
29 words
The process improvement of claim 11 wherein the takeup speed is 3400 ypm (3107 mpm), and in the increase in draw ratio is from about 1.7 to about 1.9.
Claim 21
Dependent Claim
13 words
The process improvement of claim 11 wherein the chain branching agent is pentaerythritol.
Claim 22
Dependent Claim
17 words
The process improvement of claim 11 wherein the chain branching agent is 2 methoxy-2 methyl-1,3 propane diol.
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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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |