US4473611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous polymeric material containing a reinforcing and heat-sealable material
Assignee: Lever Brothers Co
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Filing: 1983-11-21
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Granted: 1984-09-25
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Expires: 2003-11-21
Abstract
Abstract A highly porous polymeric material which may be dry or contain an included liquid, for example, a cleaning composition, is reinforced and rendered heat-sealable by the incorporation of thermoplastic fibrous, particulate or foraminous material. The polymeric material is preferably a styrene homo- or copolymer prepared by polymerization of a high-internal-phase emulsion. Sheets of the porous polymer may be sandwiched between two liquid-permeable substrate layers to form a wiping cloth or the like.
Inventors
- 👤 Zia Haq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:18
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/26; A; A47; A47L; A47L13/00; A47L13/10; A47L13/16; A47L13/17; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61L15/26; A61L9/00; A61L9/015; A61L9/04; A61L9/042; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/302; B32B3/266; B32B5/00; B32B5/02; B32B5/022; C; C08; C08J; C08J9/00; C08J9/0085; C08J9/28; C08J9/286; C11; C11D; C11D17/00; C11D17/04; C11D17/049; B32B2250/00; B32B2250/03; B32B2305/00; B32B2305/02; B32B2305/026; B32B2305/08; B32B2305/38; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/726; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T428/24843; Y10T428/24934; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/15; Y10T442/60; Y10T442/647; Y10T442/651
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
70 words
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 that water on the application thereto of hand pressure, the porous polymeric material being dry or containing an aqueous or non-aqueous liquid, and the porous polymeric material having incorporated therein a reinforcing and heat-sealable material in fibrous, particulate or foraminous form.
Claim 2
Dependent Claim
70 words
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 that water on the application thereto of hand pressure, the porous polymeric material being dry or containing an aqueous or non-aqueous liquid, and the porous polymeric material having incorporated therein a reinforcing and heat-sealable material in fibrous, particulate or foraminous form.
Claim 3
Dependent Claim
30 words
The material of claim 1, wherein the reinforcing and heat-sealable material is in the form of a web or sheet of nonwoven fabric formed at least partially of thermoplastic fibres.
Claim 4
Dependent Claim
26 words
The material of claim 1, wherein the reinforcing and heat-sealable material is in the form of a mesh formed at least partially of thermoplastic sheet material.
Claim 5
Dependent Claim
21 words
The material of claim 1, wherein the reinforcing and heat-sealable material is in the form of loose fibres of thermoplastic material.
Claim 6
Dependent Claim
29 words
The material of claim 1, wherein the reinforcing and heat-sealable material comprises one or more thermoplastic materials selected from the group consisting of polypropylene, polyester, nylon and acrylic polymers.
Claim 7
Dependent Claim
24 words
The material of claim 1, which is capable of retaining at least 15 times its own weight of liquid, defined in terms of water.
Claim 8
Dependent Claim
24 words
The material of claim 6, which is capable of retaining at least 25 times its own weight of liquid, defined in terms of water.
Claim 9
Dependent Claim
24 words
The material of claim 7, which is capable of retaining at least 40 times its own weight of liquid, defined in terms of water.
Claim 10
Dependent Claim
14 words
The material of claim 1, having a dry density of less than 0.1 g/cc.
Claim 11
Dependent Claim
18 words
The material of claim 1, having a dry density within the range of from 0.03 to 0.08 g/cc.
Claim 12
Dependent Claim
19 words
The material of claim 1, comprising a cross-linked porous structure having a pore volume of more than 9 cc/g.
Claim 13
Dependent Claim
14 words
The material of claim 11, having a pore volume of more than 15 cc/g.
Claim 14
Dependent Claim
12 words
The material of claim 1, which is a homogeneous crosslinked block material.
Claim 15
Dependent Claim
21 words
The material of claim 1, which is the polymerisation product of a high internal phase emulsion having an aqueous internal phase.
Claim 16
Dependent Claim
31 words
The material of claim 14, which 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 17
Dependent Claim
31 words
The material of claim 14, which is the polymerisation product of a high internal phase emulsion having an aqueous internal phase which constitutes at least 95% by weight of the emulsion.
Claim 18
Dependent Claim
14 words
A material as claimed in claim 1, which is a styrene homo- or copolymer.
Claim 19
Dependent Claim
14 words
The material of claim 17, which is a polystyrene lightly cross-linked with divinyl benzene.
Claim 20
Dependent Claim
19 words
The material of claim 17, which is a styrene/butyl methacrylate copolymer lightly cross-linked with divinyl benzene or allyl methacrylate.
Claim 21
Dependent Claim
63 words
A sheet-like article suitable for delivering or absorbing a liquid, the article comprising first and second sheet substrates both comprising heat-sealable material and at least one being liquid-permeable, and, sandwiched between them, an intermediate sheet of the reinforced porous polymeric material of claim 1, the first and second sheet substrates each being heat-sealed to the reinforcing and heat-sealable material in the intermediate sheet.
Claim 22
Dependent Claim
24 words
The article of claim 20, wherein the heat-sealing is in the form of a plurality of lines distributed over the area of the article.
Claim 23
Dependent Claim
21 words
The article of claim 20, wherein one or both of the first and second substrate layers comprises paper or nonwoven fabric.
Claim 24
Dependent Claim
38 words
The article of claim 22, wherein one or both of the first and second substrate layers comprises paper or nonwoven fabric having a coating of thermoplastic film, said coating being provided with pinholes for the passage of liquid.
Claim 25
Dependent Claim
54 words
The article of claim 20, wherein the porous polymeric material of the intermediate layer 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.
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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) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |