US4740528A
Expired / Lapsed
US
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Superwicking crosslinked polyurethane foam composition containing amino acid
Assignee: Kimberly Clark Worldwide Inc
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Filing: 1986-07-18
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Granted: 1988-04-26
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Expires: 2006-07-18
Abstract
Abstract An absorbent superwicking crosslinked polyurethane foam composition, into which is incorporated an effective amount of at least one amino acid, a one percent by weight aqueous solution of which has a pH of no more than about 8. The amino acid contains one amino group and at least one carboxylic acid group. A method for preparing such compositions also is described. The polyurethane foam composition is useful as a sponge and in the manufacture of such absorbent composite structures as disposable diapers, incontinent products, disposable bibs, feminine care products such as tampons and napkins, and the like.
Inventors
- 👤 Chad E. Garvey
- 👤 Gerard J. F. Ring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:30
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
51 words
An absorbent superwicking crosslinked polyurethane foam composition having incorporated therein an effective amount of at least one amino acid, a one percent by weight aqueous solution of which has a pH of no more than about 8, said amino acid containing one amino group and at least one carboxylic acid group.
Claim 2
Dependent Claim
51 words
An absorbent superwicking crosslinked polyurethane foam composition having incorporated therein an effective amount of at least one amino acid, a one percent by weight aqueous solution of which has a pH of no more than about 8, said amino acid containing one amino group and at least one carboxylic acid group.
Claim 3
Dependent Claim
14 words
The polyurethane foam composition of claim 1, in which said amino acid is glycine.
Claim 4
Dependent Claim
15 words
The polyurethane foam composition of claim 1, in which said amino acid is p-aminobenzioc acid.
Claim 5
Dependent Claim
32 words
the polyurethane foam composition of claim 1, in which said amino acid contains two or more carboxylic acid groups and has a pKA1 of the free acid of less than about 7.
Claim 6
Dependent Claim
110 words
The polyurethane foam composition of claim 4, in which said amino acid has the general formula, ##STR2## in which R 1 , R 2 , R 3 , and R 4 , are monovalent groups independently selected from the group consisting of hydrogen, hydroxy, carboxy, and mercapto; M 1 and M 2 independently are selected from the group consisting of hydrogen and an alkali metal, with the proviso that both M 1 and M 2 cannot be an alkali metal, m is an integer from one to three; n is an integer from zero to three; and the sum of m plus n is equal to or less than five.
Claim 7
Dependent Claim
34 words
The polyurethane foam composition of claim 5, in which each of R 1 , R 2 , R 3 , and R 4 is hydrogen; m is one or two; and n is zero.
Claim 8
Dependent Claim
19 words
The polyurethane foam composition of claim 6, in which said amino acid is the monopotassium salt of glutamic acid.
Claim 9
Dependent Claim
19 words
The polyurethane foam composition of claim 6, in which said amino acid is the monopotassium salt of aspartic acid.
Claim 10
Independent Claim
69 words
A method of preparing an absorbent superwicking crosslinked polyurethane foam composition which comprises mixing an isocyanate-capped prepolymer having an isocyanate functionality greater than two with an aqueous solution containing an effective amount of at least one amino acid, a one percent by weight aqueous solution of which has a pH of less than about 8, said amino acid containing one amino group and at least one carboxylic acid group.
Claim 11
Independent Claim
69 words
A method of preparing an absorbent superwicking crosslinked polyurethane foam composition which comprises mixing an isocyanate-capped prepolymer having an isocyanate functionality greater than two with an aqueous solution containing an effective amount of at least one amino acid, a one percent by weight aqueous solution of which has a pH of less than about 8, said amino acid containing one amino group and at least one carboxylic acid group.
Claim 12
Dependent Claim
18 words
The method of claim 9, in which said prepolymer has an isocyanate funtionality of at least about 2.3.
Claim 13
Dependent Claim
26 words
The method of claim 9, in which the temperature of the reaction which results from said mixing is maintained at or below about 40 degrees C.
Claim 14
Dependent Claim
14 words
The method of claim 9, in which the aqueous solution also contains a surfactant.
Claim 15
Dependent Claim
12 words
The method of claim 9, in which said amino acid is glycine.
Claim 16
Dependent Claim
13 words
The method of claim 9, in which said amino acid is p-aminobenzoic acid.
Claim 17
Dependent Claim
30 words
The method of claim 9, in which said amino acid contains two or more carboxylic acid groups and has a pKA1 of the free acid of less than about 7.
Claim 18
Dependent Claim
106 words
The method of claim 15, in which said amino acid has the general formula, ##STR3## in which R 1 , R 2 , R 3 , and R 4 are monovalent groups selected from the group consisting of hydrogen, hydroxy, carboxy, and mercapto; M 1 and M 2 independently are selected from the group consisting of hydrogen and an alkali metal, with the proviso that both M 1 and M 2 cannot be an alkali metal; m is an integer from one to three; n is an integer from zero to three; and the sum of m plus n is equal to or less than five.
Claim 19
Dependent Claim
17 words
The method of claim 16, in which said amino acid is the monopotassium salt of glutamic acid.
Claim 20
Dependent Claim
17 words
The method of claim 16, in which said amino acid is the monopotassium salt of aspartic acid.
Claim 21
Dependent Claim
58 words
An absorbent composite structure comprising an absorbent superwicking crosslinked polyurethane foam article having incorporated in said foam an effective amount of at least one amino acid, a one percent by weight aqueous solution of which has a pH of no more than about 8, said amino acid containing one amino group and at least one carboxylic acid group.
Claim 22
Dependent Claim
58 words
An absorbent composite structure comprising an absorbent superwicking crosslinked polyurethane foam article having incorporated in said foam an effective amount of at least one amino acid, a one percent by weight aqueous solution of which has a pH of no more than about 8, said amino acid containing one amino group and at least one carboxylic acid group.
Claim 23
Dependent Claim
60 words
An absorbent, layered composite structure in which at least one layer comprises an absorbent superwicking crosslinked polyurethane foam having incorporated therein an effective amount of at least one amino acid, a one percent aqueous solution of which has a pH of no more than about 8, said amino acid containing one amino group and at least one carboxylic acid group.
Claim 24
Dependent Claim
60 words
An absorbent, layered composite structure in which at least one layer comprises an absorbent superwicking crosslinked polyurethane foam having incorporated therein an effective amount of at least one amino acid, a one percent aqueous solution of which has a pH of no more than about 8, said amino acid containing one amino group and at least one carboxylic acid group.
References Cited (Backward Citations)
US4127516A
Cited
US4182827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |