US4880868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended shelf life water-absorbing composition which facilitates fiber formation
Assignee: CAMELOT S A Inc
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Filing: 1987-12-17
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Granted: 1989-11-14
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Expires: 2007-12-17
Abstract
Abstract A copolymer of recurring units of at least one α, β-unsaturated monomer and recurring units of at least one copolymerizable comonomer comprising, in its preferred embodiment from about 20 to about 80 percent pendant carboxylic acid units and from about 80 to about 20 percent pendant carboxylate salt units, is blended with at least one monomer containing at least two hydroxyl groups to produce a water-absorbing composition upon curing. The composition is particularly suitable for fiber formation.
Inventors
- 👤 Bi Le-Khac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:20
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; D; D01; D01F; D01F6/00; D01F6/02; D01F6/16; D01F6/28; D01F6/36
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
74 words
A stable, heat curable aqueous composition comprising: (a) a copolymer containing from about 25 to about 75 mole percent of about 20 to about 80 percent neutralized carboxylic acid substituted ethylenic units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer; and (b) at least one unreacted compound containing at least two hydroxyl groups, wherein the resulting aqueous composition is uncured and stable at room temperature.
Claim 2
Dependent Claim
74 words
A stable, heat curable aqueous composition comprising: (a) a copolymer containing from about 25 to about 75 mole percent of about 20 to about 80 percent neutralized carboxylic acid substituted ethylenic units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer; and (b) at least one unreacted compound containing at least two hydroxyl groups, wherein the resulting aqueous composition is uncured and stable at room temperature.
Claim 3
Dependent Claim
37 words
The aqueous composition of claim 1 in which copolymer (a) contains from about 35 to about 65 mole percent of said ethylenic units and from about 65 to about 35 mole percent recurring units of copolymerizable monomer.
Claim 4
Dependent Claim
14 words
The aqueous composition of claim 1 in which copolymer (a) is an equimolar copolymer.
Claim 5
Dependent Claim
25 words
The aqueous composition of claim 1 in which in copolymer (a) from about 30 to about 70 percent of the carboxylic acid units are neutralized.
Claim 6
Dependent Claim
18 words
The aqueous composition of claim 1 in which compound (b) has a molecular weight of less than 1,000.
Claim 7
Dependent Claim
50 words
The aqueous composition of claim 1 in which compound (b) is selected from the group consisting of alkylene glycols containing 2-10 carbon atoms and their ethers, cycloalkylene glycols, bisphenol A, hydroxy alkylene derivatives of bisphenol A, hydroquinone, phloroglucinol, hydroxy alkylene derivatives of diphenols, glycerol, erythritol, pentaerythritol, and all natural monosaccharides.
Claim 8
Dependent Claim
13 words
The aqueous composition of claim 1 in which compound (b) is propylene glycol.
Claim 9
Dependent Claim
13 words
The aqueous composition of claim 1 in which compound (b) is ethylene glycol.
Claim 10
Dependent Claim
12 words
The aqueous composition of claim 1 in which compound (b) is 1,4-butanediol.
Claim 11
Dependent Claim
12 words
The aqueous composition of claim 1 in which compound (b) is glycerol.
Claim 12
Dependent Claim
13 words
The aqueous composition of claim 1 in which compound (b) is diethylene glycol.
Claim 13
Dependent Claim
12 words
The aqueous composition of claim 1 in which compound (b) is pentaerythritol.
Claim 14
Dependent Claim
16 words
The aqueous composition of claim 1 in which compound (b) is a mixture of two compounds.
Claim 15
Dependent Claim
34 words
The aqueous composition of claim 1 in which compound (b) is a mixture of at least two compounds selected from the group consisting of ethylene glycol, propylene glycol, 1,4-butanediol, glycerol, diethylene glycol, and pentaerythritol.
Claim 16
Dependent Claim
17 words
The aqueous composition of claim 1 in which compound (b) is a mixture of 1,4-butanediol and pentaerythritol.
Claim 17
Dependent Claim
29 words
The aqueous composition of claim 1 containing in weight percent from about 80 to about 99.5 of copolymer (a) and from about 20 to about 0.5 of compound (b).
Claim 18
Dependent Claim
29 words
The aqueous composition of claim 1 containing in weight percent from about 90 to about 99 of copolymer (a) and from about 10 to about 1 of compound (b).
Claim 19
Dependent Claim
18 words
The aqueous composition of claim 1 being heat curable at a temperature of about 140° C. or higher.
Claim 20
Dependent Claim
99 words
A stable, heat curable aqueous composition comprising in weight percent: (a) from about 80 to about 99.5 of a copolymer containing from about 25 to about 75 mole percent of about 20 to about 80 percent neutralized carboxylic acid substituted ethylenic units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer; and (b) from about 20 to about 0.5 of at least one compound containing at least two hydroxyl groups and having a molecular weight of less than about 1,000, wherein the resulting uncured aqueous composition is stable at room temperature.
Claim 21
Dependent Claim
99 words
A stable, heat curable aqueous composition comprising in weight percent: (a) from about 80 to about 99.5 of a copolymer containing from about 25 to about 75 mole percent of about 20 to about 80 percent neutralized carboxylic acid substituted ethylenic units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer; and (b) from about 20 to about 0.5 of at least one compound containing at least two hydroxyl groups and having a molecular weight of less than about 1,000, wherein the resulting uncured aqueous composition is stable at room temperature.
Claim 22
Dependent Claim
17 words
The aqueous composition of claim 19 in which compound (b) is a mixture of 1,4-butanediol and pentaerythritol.
Claim 23
Dependent Claim
29 words
The aqueous composition of claim 19 comprising in weight percent from about 90 to about 99 of copolymer (a) and from about 10 to about 1 of compound (b).
Claim 24
Dependent Claim
22 words
A method of rendering the aqueous composition of claim 1 water-absorbing which comprises heating the composition to a temperature sufficient to cure.
Claim 25
Dependent Claim
19 words
The method of claim 22 in which the composition is heated to a temperature of at least 140° C.
Claim 26
Dependent Claim
22 words
A method of rendering the aqueous composition of claim 19 water-absorbing which comprises heating the composition to a temperature sufficient to cure.
Claim 27
Dependent Claim
19 words
The method of claim 24 in which the composition is heated to a temperature of at least 140° C.
Claim 28
Dependent Claim
86 words
A water-absorbing product comprising a cross-linked reaction product of: (a) a copolymer containing from about 25 to about 75 mole percent of from about 20 to about 80 percent neutralized carboxylic acid substituted ethylenic units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer; and (b) at least one unreacted compound containing at least two hydroxyl groups, wherein the mixture is cross-linked by the formation of ether linkages between carboxylic acid groups pendant from the recurring ethylenic units.
Claim 29
Dependent Claim
86 words
A water-absorbing product comprising a cross-linked reaction product of: (a) a copolymer containing from about 25 to about 75 mole percent of from about 20 to about 80 percent neutralized carboxylic acid substituted ethylenic units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer; and (b) at least one unreacted compound containing at least two hydroxyl groups, wherein the mixture is cross-linked by the formation of ether linkages between carboxylic acid groups pendant from the recurring ethylenic units.
Claim 30
Dependent Claim
12 words
The water-absorbing product of claim 26 in the form of a fiber.
Claim 31
Dependent Claim
12 words
The water-absorbing product of claim 26 in the form of a film.
Claim 32
Dependent Claim
108 words
A water-absorbing product comprising a cross-linked reaction product of: (a) from about 80 to about 99.5 of a copolymer containing from about 25 to about 75 mole percent of about 20 to about 80 percent neutralized carboxylic acid substituted ethylenic units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer; and (b) from about 20 to about 0.5 of at least one compound containing at least two hydroxyl groups and having a molecular weight of less than about 1,000, wherein the mixture is cross-linked by the formation of ether linkages between carboxylic acid groups pendant from the recurring ethylenic units.
Claim 33
Dependent Claim
108 words
A water-absorbing product comprising a cross-linked reaction product of: (a) from about 80 to about 99.5 of a copolymer containing from about 25 to about 75 mole percent of about 20 to about 80 percent neutralized carboxylic acid substituted ethylenic units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer; and (b) from about 20 to about 0.5 of at least one compound containing at least two hydroxyl groups and having a molecular weight of less than about 1,000, wherein the mixture is cross-linked by the formation of ether linkages between carboxylic acid groups pendant from the recurring ethylenic units.
Claim 34
Dependent Claim
12 words
The water-absorbing product of claim 29 in the form of a fiber.
Claim 35
Dependent Claim
12 words
The water-absorbing product of claim 29 in the form of a film.
References Cited (Backward Citations)
US3810468A
Cited
US3669103A
Cited
US3678016A
Cited
US3983095A
Cited
US3989586A
Cited
US3980663A
Cited
US4056502A
Cited
US3993616A
Cited
US3954721A
Cited
US4155957A
Cited
US4211851A
Cited
US4332917A
Cited
US4338417A
Cited
US4420588A
Cited
US4616063A
Cited
US4705773A
Cited
US4743244A
Cited
US4813945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |