US4725636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elasthane threads, their production and intermediate products required therefor
Assignee: Bayer AG
•
Filing: 1986-04-03
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Granted: 1988-02-16
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Expires: 2006-04-03
Abstract
Abstract In the production of elasthane threads by solution spinning of polyurea polyurethanes by conventional spinning processes, excellent stabilization against light and noxious gases are obtained if at least one component of the system to be spun contains tertiary amino groups and the substances used as antioxidizing agents are phenols of the kind which do not form colored nitro compounds.
Inventors
- 👤 Michael Kausch
- 👤 Hans Schroer
- 👤 Karl-Heinz Wolf
- 👤 Heinz Gall
- 👤 Carlhans Suling
- 👤 Rudi Dauscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:51
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/70; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/3275; C08G18/3287; C08K; C08K5/00; C08K5/0008; C08K5/005; C08K5/04; C08K5/13; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
51 words
Process for the production of elasthane threads by solution spinning of polyurea polyurethanes by conventional spinning processes, characterised in that at least one component of the system which is to be spun contains tertiary amino groups and in that phenols which do not form coloured nitro compounds are used as anti-oxidants.
Claim 2
Dependent Claim
51 words
Process for the production of elasthane threads by solution spinning of polyurea polyurethanes by conventional spinning processes, characterised in that at least one component of the system which is to be spun contains tertiary amino groups and in that phenols which do not form coloured nitro compounds are used as anti-oxidants.
Claim 3
Dependent Claim
57 words
Process according to claim 1, characterised in that the phenols correspond to the formula ##STR3## wherein R 1 denotes C 1 -C 6 Alkyl, R 2 and R 3 denote, independently, C 1 -c 6 alkyl or --(CH 2 ) n --X, n denotes 1 or 2, and X denotes a monovalent or higher valent acyl group.
Claim 4
Dependent Claim
25 words
Process according to claim 1, characterised in that the polyurea polyurethanes are synthesized from polyester diols in the molecular weight range from 1,000 to 6,000.
Claim 5
Dependent Claim
25 words
Process according to claim 1, characterised in that the polyurea polyurethanes are synthesized from polyether diols in the molecular weight range from 1,000 to 6,000.
Claim 6
Dependent Claim
24 words
Process according to claim 1, characterised in that the tertiary amino groups are introduced in the form of additives added to the spinning solution.
Claim 7
Dependent Claim
18 words
Process according to claim 5, characterised in that the additives are polyurethanes obtained from aliphatic diisocyanates and N-tertiary-pentyl-dipropanolamine.
Claim 8
Dependent Claim
51 words
Process according to claim 1, characterised in that the phenols are used in a quantity of from 0.1 to 2% by weight, based on the polyurethane urea, and the tertiary amines are used in such a quantity that elasthane containing from 0.02 to 0.3% by weight of tertiary nitrogen are obtained.
Claim 9
Dependent Claim
12 words
Polyurethanes, characterised in that they are synthesized from aliphatic diisocyanates and 4-tertiarypentyl-4-azaheptandiol-2,6.
Claim 10
Dependent Claim
12 words
Polyurethanes, characterised in that they are synthesized from aliphatic diisocyanates and 4-tertiarypentyl-4-azaheptandiol-2,6.
Claim 11
Dependent Claim
32 words
Stabilised elasthane threads of segmented polyurethanes based on polyester or polyetherdiols and at least an aromatic diisocyanate containing a tertiary amino group and such phenols which do not form coloured nitro compounds.
Claim 12
Dependent Claim
32 words
Stabilised elasthane threads of segmented polyurethanes based on polyester or polyetherdiols and at least an aromatic diisocyanate containing a tertiary amino group and such phenols which do not form coloured nitro compounds.
References Cited (Backward Citations)
US3461106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |