US4110276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester foam materials
Assignee: Procter and Gamble Co
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Filing: 1977-10-19
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Granted: 1978-08-29
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Expires: 1997-10-19
Abstract
Abstract Resilient polyester foam materials. Acyl halide, polyol, and polyhydroxy cross-linking agent are reacted in the presence of alkali metal carbonate to prepare the resilient polyester foams. A process similar to that used in the one-shot preparation of polyurethane foams is used. Preferred reactants are adipyl chloride, quadrafunctional polyol based on pentaerythritol, propoxylated pentaerythritol cross-linking agent, and sodium carbonate. The resilient polyester foams find use in products such as catamenial tampons.
Inventors
- 👤 Thomas A. DesMarais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:33
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; C08G; C08G63/00; C08G63/66; C08G63/668; C08J9/0066; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08J2367/00; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S521/918
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
79 words
A stable, resilient polyester foam comprising a three-dimensional condensate of: (a) at least one polyol having at least two hydroxyl groups and an equivalent weight of at least about 1,000; (b) at least one propylene oxide-based polyhydroxy cross-linking agent having at least three hydroxyl groups and an equivalent weight of less than about 250 said equivalent weight based hydroxy groups; and (c) at least one acyl halide having at least two --COX radicals wherein X is a halogen atom.
Claim 2
Dependent Claim
79 words
A stable, resilient polyester foam comprising a three-dimensional condensate of: (a) at least one polyol having at least two hydroxyl groups and an equivalent weight of at least about 1,000; (b) at least one propylene oxide-based polyhydroxy cross-linking agent having at least three hydroxyl groups and an equivalent weight of less than about 250 said equivalent weight based hydroxy groups; and (c) at least one acyl halide having at least two --COX radicals wherein X is a halogen atom.
Claim 3
Dependent Claim
73 words
A stable, resilient polyester foam comprising a three-dimensional condensate of: (a) at least one polyol having at least two hydroxyl groups and an equivalent weight of at least about 1,000; (b) at least one propylene oxide-based polyhydroxy cross-linking agent having at least three hydroxyl groups and a molecular weight of less than about 500; and (c) at least one acyl halide having at least two --COX radicals wherein X is a halogen atom.
Claim 4
Dependent Claim
73 words
A stable, resilient polyester foam comprising a three-dimensional condensate of: (a) at least one polyol having at least two hydroxyl groups and an equivalent weight of at least about 1,000; (b) at least one propylene oxide-based polyhydroxy cross-linking agent having at least three hydroxyl groups and a molecular weight of less than about 500; and (c) at least one acyl halide having at least two --COX radicals wherein X is a halogen atom.
Claim 5
Dependent Claim
42 words
A polyester foam according to claim 2 which comprises: (a) one part by weight of polyol; (b) from about 0.15 part by weight to about 0.80 part by weight of polyhydroxy cross-linking agent; and (c) a substantially stoichiometric amount of acyl halide.
Claim 6
Dependent Claim
32 words
A hydrophilic polyester foam according to claim 3 wherein the polyol is an ethylene oxide-propylene oxide polymer and is characterized by an ethylene oxide content of at least about 60% by weight.
Claim 7
Dependent Claim
11 words
A foam according to claim 4 wherein the polyol is quadrafunctional.
Claim 8
Dependent Claim
19 words
A foam according to claim 5 wherein the quadrafunctional polyol is an ethylene oxide-propylene oxide polymer based on pentaerythritol.
Claim 9
Dependent Claim
13 words
A foam according to claim 4 wherein the polyhydroxy cross-linking agent is quadrafunctional.
Claim 10
Dependent Claim
19 words
A foam according to claim 7 wherein the quadrafunctional polyhydroxy cross-linking agent is a propylene oxide adduct of pentaerythritol.
Claim 11
Dependent Claim
73 words
A stable, resilient, hydrophilic polyester foam according to claim 3, comprising a three-dimensional condensate wherein (a) the polyol is a quadrafunctional ethylene oxide-propylene oxide block copolymer of pentaerythritol and is characterized by an ethylene oxide content of at least about 60% by weight and a molecular weight of at least about 4,000; (b) the polyhydroxy cross-linking agent is a quadrafunctional propylene oxide adduct of pentaerythritol; and (c) the acyl halide is adipyl chloride.
Claim 12
Dependent Claim
13 words
A pharmacologically acceptable foam according to claim 9 which is substantially open celled.
Claim 13
Dependent Claim
23 words
A foam according to claim 10 wherein the open-celled foam is characterized by from about 50 to about 400 cells per linear inch.
Claim 14
Dependent Claim
28 words
A foam according to claim 11 which is especially adapted for absorbing body fluids and which is characterized by a density of about 0.06 grams per cubic centimeter.
Claim 15
Dependent Claim
32 words
A hydrophobic polyester foam according to claim 3 wherein the polyol is an ethylene oxide-propylene oxide polymer and is characterized by a propylene oxide content of at least about 60% by weight.
Claim 16
Dependent Claim
11 words
A foam according to claim 13 wherein the polyol is quadrafunctional.
Claim 17
Dependent Claim
19 words
A foam according to claim 14 wherein the quadrafunctional polyol is an ethylene oxide-propylene oxide polymer based on pentaerythritol.
Claim 18
Dependent Claim
13 words
A foam according to claim 13 wherein the polyhydroxy cross-linking agent is quadrafunctional.
Claim 19
Dependent Claim
19 words
A foam according to claim 16 wherein the quadrafunctional polyhydroxy cross-linking agent is a propylene oxide adduct of pentaerythritol.
Claim 20
Dependent Claim
81 words
A process for making a stable, resilient polyester foam comprising reacting: (a) at least one polyol having at least two hydroxyl groups and an equivalent weight of at least about 1,000; (b) at least one propylene oxide-based polyhydroxy cross-linking agent having at least three hydroxyl groups and an equivalent weight of less than about 250; and (c) at least one acyl halide having at least two --COX radicals wherein X is a halogen atom; in the presence of alkali metal carbonate.
Claim 21
Dependent Claim
81 words
A process for making a stable, resilient polyester foam comprising reacting: (a) at least one polyol having at least two hydroxyl groups and an equivalent weight of at least about 1,000; (b) at least one propylene oxide-based polyhydroxy cross-linking agent having at least three hydroxyl groups and an equivalent weight of less than about 250; and (c) at least one acyl halide having at least two --COX radicals wherein X is a halogen atom; in the presence of alkali metal carbonate.
Claim 22
Dependent Claim
26 words
The process of claim 18 wherein at least a portion of said polyhydroxy cross-linking agent is prereacted with at least a portion of said acyl halide.
Claim 23
Dependent Claim
81 words
A process for making a stable, resilient polyester foam comprising reacting: (a) at least one polyol having at least two hydroxyl groups and an equivalent weight of at least about 1,000; (b) at least one propylene oxide-based polyhydroxy cross-linking agent having at least three hydroxyl groups and a molecular weight of less than about 500; and (c) at least one acyl halide having at least two --COX radicals wherein X is a halogen atom; in the presence of alkali metal carbonate.
Claim 24
Dependent Claim
81 words
A process for making a stable, resilient polyester foam comprising reacting: (a) at least one polyol having at least two hydroxyl groups and an equivalent weight of at least about 1,000; (b) at least one propylene oxide-based polyhydroxy cross-linking agent having at least three hydroxyl groups and a molecular weight of less than about 500; and (c) at least one acyl halide having at least two --COX radicals wherein X is a halogen atom; in the presence of alkali metal carbonate.
Claim 25
Dependent Claim
76 words
The process of claim 20 wherein there is reacted: (a) one part by weight of polyol; (b) from about 0.15 part by weight to about 0.80 part by weight of polyhydroxy cross-linking agent; and (c) a substantially stoichiometric amount of acyl halide; and wherein there is present an amount of alkali metal carbonate equal to from about 2% to about 150% by weight of the total amount of polyol, polyhydroxy cross-linking agent and acyl halide present.
Claim 26
Dependent Claim
29 words
The process of claim 21 wherein the polyol is an ethylene oxide-propylene oxide polymer and is characterized by an ethylene oxide content of at least about 60% by weight.
Claim 27
Dependent Claim
10 words
The process of claim 22 wherein the polyol is quadrafunctional.
Claim 28
Dependent Claim
18 words
The process of claim 23 wherein the quadrafunctional polyol is an ethylene oxide-propylene oxide polymer based on pentaerythritol.
Claim 29
Dependent Claim
12 words
The process of claim 22 wherein the polyhydroxy cross-linking agent is quadrafunctional.
Claim 30
Dependent Claim
18 words
The process of claim 25 wherein the quadrafunctional polyhydroxy cross-linking agent is a propylene oxide adduct of pentaerythritol.
Claim 31
Dependent Claim
64 words
The process of claim 21 wherein: (a) the polyol is a quadrafunctional ethylene oxide-propylene oxide block copolymer of pentaerythritol and is characterized by an ethylene oxide content of at least about 60% by weight and a molecular weight of at least about 4,000; (b) the polyhydroxy cross-linking agent is a quadrafunctional propylene oxide adduct of pentaerythritol; and (c) the acyl halide is adipyl chloride.
Claim 32
Dependent Claim
26 words
The process of claim 27 which includes the additional steps of curing the foam and compressing the cured foam to about 20% of its original volume.
Claim 33
Dependent Claim
26 words
The process of claim 20 which includes the additional steps of curing the foam and compressing the cured foam to about 20% of its original volume.
Claim 34
Dependent Claim
26 words
The process of claim 20 wherein at least a portion of said polyhydroxy cross-linking agent is prereacted with at least a portion of said acyl halide.
References Cited (Backward Citations)
US3815601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |