US4797310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substrate carrying a porous polymeric material
Assignee: Lever Brothers Co
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Filing: 1982-06-22
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Granted: 1989-01-10
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Expires: 2002-06-22
Abstract
Abstract An article suitable for delivering or absorbing liquid includes a substrate carrying a pressure-sensitive porous polymeric material which is capable of retaining at least 10 times its own weight of water or corresponding amounts of other liquids. The porous polymeric material is advantageously a crosslinked homogeneous block material having a dry density of less than 0.1 g/cc and a pore volume of more than 9 cc/g, and may be produced by polymerization of a high internal phase emulsion. In the article of the invention, the polymer may either be dry or contain an included liquid; the dry form is highly absorbent and is useful for mopping up slippages, while the liquid-containing form is useful for delivering treatment liquids, for example, cleaning compositions, to surfaces. The article may take the form of a single- or multi-compartment sachet of paper or nonwoven fabric containing the porous polymeric material.
Inventors
- 👤 Donald Barby
- 👤 Zia Haq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:33
CPC Classifications
A; A47; A47L; A47L13/00; A47L13/10; A47L13/16; A47L13/17; B; B08; B08B; B08B1/00; B08B1/10; B08B1/14; B08B1/143; C; C08; C08J; C08J9/00; C08J9/28; C08J9/283; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/239; Y10T428/249921; Y10T428/249953; Y10T428/249981
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
62 words
An article suitable for delivering liquid, said article comprising a flexible liquid-permeable substrate carrying a pressure-sensitive porous polymeric material capable of retaining at least 5 times its own weight, defined in terms of water, of liquid and of releasing at least some of said liquid on the application thereto of hand pressure, the porous polymeric material containing an aqueous or non-aqueous liquid.
Claim 2
Dependent Claim
62 words
An article suitable for delivering liquid, said article comprising a flexible liquid-permeable substrate carrying a pressure-sensitive porous polymeric material capable of retaining at least 5 times its own weight, defined in terms of water, of liquid and of releasing at least some of said liquid on the application thereto of hand pressure, the porous polymeric material containing an aqueous or non-aqueous liquid.
Claim 3
Dependent Claim
28 words
The article of claim 1, wherein the porous polymeric material is capable of retaining at least 10 times its own weight of liquid, defined in terms of water.
Claim 4
Dependent Claim
28 words
The article of claim 1, wherein the porous polymeric material is capable of retaining at least 25 times its own weight of liquid, defined in terms of water.
Claim 5
Dependent Claim
19 words
The article of claim 1, wherein the porous polymeric material has a dry density of less than 0.1 g/cc.
Claim 6
Dependent Claim
22 words
The article of claim 1, wherein the porous polymeric material comprises linked pores having a pore volume of more than 9 cc/g.
Claim 7
Dependent Claim
35 words
The article of claim 1, wherein the porous polymeric material is the polymerisation product of a high internal phase emulsion having an aqueous internal phase which constitutes at least 90% by weight of the emulsion.
Claim 8
Dependent Claim
19 words
The article of claim 1, wherein the porous polymeric material is selected from the group consisting of vinyl polymers.
Claim 9
Dependent Claim
14 words
The article of claim 7, wherein the porous polymeric material is a styrene polymer.
Claim 10
Dependent Claim
18 words
The article of claim 1, wherein the substrate comprises one or more layers of paper and/or nonwoven fabric.
Claim 11
Dependent Claim
26 words
The article of claim 1, wherein the porous polymeric material is enclosed within a sachet, at least one wall of said sachet being permeable to liquid.
Claim 12
Dependent Claim
43 words
The article of claim 1, which comprises a first substrate layer and a second substrate layer so bonded together so to create a plurality of compartments therebetween, at least some of said components containing said porous polymeric material and being permeable to liquid.
Claim 13
Dependent Claim
50 words
The article of claim 1, wherein the porous polymeric material contains a homogeneous aqueous liquid composition having a surface tension of less than 45 mNm -1 , which composition, when applied to a surface and allowed to dry, dries substantially without forming discrete droplets or particles larger than 0.25 μm.
Claim 14
Dependent Claim
18 words
The article of claim 1, wherein the porous polymeric material contains an aqueous liquid comprising a surface-active agent.
Claim 15
Dependent Claim
19 words
The article of claim 1, wherein the porous polymeric material contains an aqueous liquid comprising a partially esterified resin.
Claim 16
Dependent Claim
68 words
An article suitable for deliveirng or absorbing a liquid, said article comprising a flexible liquid-permeable substrate surrounding a pressure-sensitive porous polymeric material capable of retaining at least 10 times its own weight, defined in terms of water, of liquid and of releasing at least some of said liquid on the applicaiton thereto of hand pressure, the porous polymeric material being dry or containing an aqueous or non-aqueous liquid.
Claim 17
Dependent Claim
68 words
An article suitable for deliveirng or absorbing a liquid, said article comprising a flexible liquid-permeable substrate surrounding a pressure-sensitive porous polymeric material capable of retaining at least 10 times its own weight, defined in terms of water, of liquid and of releasing at least some of said liquid on the applicaiton thereto of hand pressure, the porous polymeric material being dry or containing an aqueous or non-aqueous liquid.
Claim 18
Dependent Claim
88 words
An article suitable for delivering or absorbing a liquid, said article comprising a flexible liquid-permeable substrate surrounding a pressure-sensitive porous polymeric material which is the polymerization product of a high internal phase emulsion having an aqueous internal phase, the porous polymeric material being capable of retaining at least 5 times it own weight, defined in terms of water, of liquid and releasing at least some of said liquid on the application thereto of hand pressure, the porous polymeric material being dry or containing an aqueous or non-aqueous liquid.
Claim 19
Dependent Claim
88 words
An article suitable for delivering or absorbing a liquid, said article comprising a flexible liquid-permeable substrate surrounding a pressure-sensitive porous polymeric material which is the polymerization product of a high internal phase emulsion having an aqueous internal phase, the porous polymeric material being capable of retaining at least 5 times it own weight, defined in terms of water, of liquid and releasing at least some of said liquid on the application thereto of hand pressure, the porous polymeric material being dry or containing an aqueous or non-aqueous liquid.
Claim 20
Dependent Claim
66 words
An article suitable for delivering a cleaning liquid, said article comprising a flexible liquid permeable substrate surrounding a pressure-sensitive porous polymeric material capable of retaining at least 5 times its own weight, defined in terms of water, of liquid and of releasing at least some of said liquid on the application thereto of hand pressure, the porous polymeric material containing an aqueous or non-aqueous cleaning liquid.
Claim 21
Dependent Claim
66 words
An article suitable for delivering a cleaning liquid, said article comprising a flexible liquid permeable substrate surrounding a pressure-sensitive porous polymeric material capable of retaining at least 5 times its own weight, defined in terms of water, of liquid and of releasing at least some of said liquid on the application thereto of hand pressure, the porous polymeric material containing an aqueous or non-aqueous cleaning liquid.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |