US3987141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for spinning polyurethane-hard polymer conjugate yarn
Assignee: Monsanto Co
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Filing: 1974-06-24
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Granted: 1976-10-19
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Expires: 1994-06-24
Abstract
Abstract Drawing performance of a conjugated elastomeric polyurethane-hard polymer yarn is improved by critical stoichiometry in preparation of the polyurethane polymer, which is made by reacting together a high molecular weight diol, a low molecular weight diol, and a diisocyanate so that the resulting polyurethane contains between 1 and 45 (preferably between 1 and 27) microequivalents of free isocyanate groups per gram of polymer at the time of melt spinning.
Inventors
- 👤 Donald H. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:23
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/10; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A process for preparing a conjugate filament, comprising: a. preparing an elastomeric polyurethane polymer having between 1 and 30 microequivalents of free isocyanate per gram of said polyurethane polymer at the time of spinning; b. melt spinning said polyurethane polymer conjugately with a hard polymer to form a conjugate filament; and c. drawing said filament at a draw ratio of at least 2.0 to 1.
Claim 2
Dependent Claim
65 words
A process for preparing a conjugate filament, comprising: a. preparing an elastomeric polyurethane polymer having between 1 and 30 microequivalents of free isocyanate per gram of said polyurethane polymer at the time of spinning; b. melt spinning said polyurethane polymer conjugately with a hard polymer to form a conjugate filament; and c. drawing said filament at a draw ratio of at least 2.0 to 1.
Claim 3
Dependent Claim
65 words
A process for preparing a conjugate filament comprising: a. preparing an elastomeric polyurethane polymer having between 1 and 27 microequivalents of free isocyanate per gram of said polyurethane polymer at the time of spinning; b. melt spinning said polyurethane polymer conjugately with a hard polymer to form a conjugate filament; and c. drawing said filament at a draw ratio of at least 2.0 to 1.
Claim 4
Dependent Claim
65 words
A process for preparing a conjugate filament comprising: a. preparing an elastomeric polyurethane polymer having between 1 and 27 microequivalents of free isocyanate per gram of said polyurethane polymer at the time of spinning; b. melt spinning said polyurethane polymer conjugately with a hard polymer to form a conjugate filament; and c. drawing said filament at a draw ratio of at least 2.0 to 1.
Claim 5
Dependent Claim
75 words
A process for preparing a drawn conjugate filament from a hard polymer and an elastomeric polyurethane polymer, said process comprising: a. measuring the free isocyanate group concentration NCO m at a time T m after said polyurethane polymer was formed; b. melt-spinning said polyurethane polymer conjugately with a hard polymer at a time ##EQU3## to form a conjugate filament; and c. drawing said conjugate filament at a draw ratio of at least 2 to 1.
Claim 6
Dependent Claim
75 words
A process for preparing a drawn conjugate filament from a hard polymer and an elastomeric polyurethane polymer, said process comprising: a. measuring the free isocyanate group concentration NCO m at a time T m after said polyurethane polymer was formed; b. melt-spinning said polyurethane polymer conjugately with a hard polymer at a time ##EQU3## to form a conjugate filament; and c. drawing said conjugate filament at a draw ratio of at least 2 to 1.
Claim 7
Dependent Claim
75 words
A process for preparing a drawn conjugate filament from a hard polymer and an elastomeric polyurethane polymer, said process comprising: a. measuring the free isocyanate group concentration NCO m at a time T m after said polyurethane polymer was formed; b. melt-spinning said polyurethane polymer conjugately with a hard polymer at a time ##EQU4## to form a conjugate filament; and c. drawing said conjugate filament at a draw ratio of at least 2 to 1.
Claim 8
Dependent Claim
75 words
A process for preparing a drawn conjugate filament from a hard polymer and an elastomeric polyurethane polymer, said process comprising: a. measuring the free isocyanate group concentration NCO m at a time T m after said polyurethane polymer was formed; b. melt-spinning said polyurethane polymer conjugately with a hard polymer at a time ##EQU4## to form a conjugate filament; and c. drawing said conjugate filament at a draw ratio of at least 2 to 1.
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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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |