US4919997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt-blown water-absorbing tissues and matts
Assignee: Honeywell International Inc
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Filing: 1987-11-06
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Granted: 1990-04-24
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Expires: 2007-11-06
Abstract
Abstract A melt-blown water-absorbing matt of fibers comprises a block copolyetheramide having polyether and polyamide segments. The matt structure provides excellent water absorbency and displays good resilience when exposed to humid conditions.
Inventors
- 👤 Ian C. Twilley
- 👤 Robert A. Lofquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:56
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10T; Y10T428/00; Y10T428/249921; Y10T428/29; Y10T428/2913; Y10T428/298; Y10T442/00; Y10T442/60; Y10T442/68; Y10T442/697
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A melt-blown water-absorbing matt of fibers comprising a block copolyetheramide having a number average molecular weight of from about 10,000 to about 35,000 and having polymer segments of the following structure: (A) a polyether segment consisting predominantly of ##STR6## where c is at least 1, (a+c) is at least 1 but less than 10 and b is at least 10 but less than 150; (B) a polyamide segment consisting of at least one of the following: ##STR7## where R 1 , R 2 and R 3 are each selected from the same or different alkylene or substituted alkylene moieties of from 4 to 11 carbons and difunctional aromatic moieties; wherein the concentration of segment A in the copolymer is between from about 10 to about 50 percent by weight of copolyether amide.
Claim 2
Dependent Claim
132 words
A melt-blown water-absorbing matt of fibers comprising a block copolyetheramide having a number average molecular weight of from about 10,000 to about 35,000 and having polymer segments of the following structure: (A) a polyether segment consisting predominantly of ##STR6## where c is at least 1, (a+c) is at least 1 but less than 10 and b is at least 10 but less than 150; (B) a polyamide segment consisting of at least one of the following: ##STR7## where R 1 , R 2 and R 3 are each selected from the same or different alkylene or substituted alkylene moieties of from 4 to 11 carbons and difunctional aromatic moieties; wherein the concentration of segment A in the copolymer is between from about 10 to about 50 percent by weight of copolyether amide.
Claim 3
Dependent Claim
32 words
The matt of claim 1 wherein a phenolic antioxidant is used in the copolymer where the ratio of antioxidant to polyether segment is greater than 0.01 but less than 0.1 by weight.
Claim 4
Dependent Claim
13 words
The matt of claim 2 wherein said copolymer additionally contains a dicarboxylic acid.
Claim 5
Dependent Claim
26 words
The matt of claim 3 wherein said dicarboxylic acid is selected from the group consisting of adipic, azelaic, terephthalic, isophthalic, dodecanedioic, sebacic and naphthalene dibasic acid.
Claim 6
Dependent Claim
12 words
The matt of claim 4 wherein said dicarboxylic acid is terephthalic acid.
Claim 7
Dependent Claim
10 words
The matt of claim 3 wherein the antioxidant is tetrakis(methylene(3,5-di-t-butyl-4-hydroxy-hydrocinnamate))methane.
Claim 8
Dependent Claim
9 words
The matt of claim 3 further comprising polypropylene fiber.
References Cited (Backward Citations)
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US3594266A
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US3654370A
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US3946089A
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US4578451A
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US4724184A
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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) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |