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US4319956A
Expired / Lapsed
US
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Nonwoven web material for medical towels and the like
Assignee: Dexter Corp
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Filing: 1980-06-16
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Granted: 1982-03-16
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Expires: 2000-06-16
Abstract
Abstract A new and improved, highly absorbent, nonwoven web material that exhibits a cytotoxicity level of zero is provided for use as a disposable medical towel and the like. The web material possesses a unique combination of physical properties, such as absorbent holding capacity equal to or greater than present commercially available products, rapid rewettability, high wet tensile strength, high delamination resistance and superior wet abrasion resistance. This unique material includes a water laid nonwoven base web saturated with an inherently hydrophobic latex binder containing up to 2 percent by weight of a polyol surfactant.
Inventors
- 👤 Charles E. Snyder
- 👤 Colin Elston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:12
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/35; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/69; Y10T442/692
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
117 words
A bonded fibrous web material well suited for use as a single use disposable medical towel and exhibiting rapid rewettability coupled with high wet abrasion resistance comprising a fibrous nonwoven web material saturation bonded with a hydrophobic latex, said bonded web having a web abrasion loss of less than about 40 percent, an absorbent holding capacity in excess of 300 percent, an absorbency rate of less than 5 seconds and a cytotoxicity level of zero, said hydrophobic latex being an internally stabilized emulsion of a crosslinkable acrylic binder and containing up to 2 percent by weight based on the solids within the latex of a nonionic, polyol surfactant having a cytotoxicity level of zero at said concentration.
Claim 2
Dependent Claim
117 words
A bonded fibrous web material well suited for use as a single use disposable medical towel and exhibiting rapid rewettability coupled with high wet abrasion resistance comprising a fibrous nonwoven web material saturation bonded with a hydrophobic latex, said bonded web having a web abrasion loss of less than about 40 percent, an absorbent holding capacity in excess of 300 percent, an absorbency rate of less than 5 seconds and a cytotoxicity level of zero, said hydrophobic latex being an internally stabilized emulsion of a crosslinkable acrylic binder and containing up to 2 percent by weight based on the solids within the latex of a nonionic, polyol surfactant having a cytotoxicity level of zero at said concentration.
Claim 3
Dependent Claim
26 words
The web material of claim 1 wherein the web material containing more than 5 percent and less than 50 percent by weight of the acrylic binder.
Claim 4
Dependent Claim
21 words
The web material of claim 1 wherein the surfactant is a nonionic condensation product of ethylene oxide and a hydrophobic base.
Claim 5
Dependent Claim
33 words
The web material of claims 1, 2 or 3 wherein the fibrous nonwoven web is comprised of a blend of natural and synthetic fibers in the form of a wet laid web material.
Claim 6
Dependent Claim
46 words
The web material of claims 1, 2 or 3 wherein the fibrous nonwoven web is comprised of 10-40 percent by weight high alpha cellulose pulp, 10-30 percent by weight hemi cellulose pulp, 5-25 percent by weight vegetable fiber and 20-35 percent by weight of synthetic fiber.
Claim 7
Dependent Claim
26 words
The web material of claim 2 wherein the acrylic binder has an ethyl acrylate base and the web material contains 10-30 percent by weight of binder.
Claim 8
Dependent Claim
20 words
The web material of claim 3 wherein the hydrophobic base is a reaction product of propylene oxide and propylene glycol.
Claim 9
Dependent Claim
18 words
The web material of claims 3 or 7 wherein the surfactant has a molecular weight of about 5,000.
Claim 10
Dependent Claim
77 words
The web material of claim 1 wherein the latex is an internally stabilized acrylic emulsion modified with a nonionic surfactant at a concentration of 1-2 percent by weight based on the solids in the latex, said web exhibiting a wet tensile strength of at least about 600 g/25 mm., an absorbent holding capacity of at least about 400 percent, an absorbency rate of less than 2 seconds and wet abrasion loss of less than about 30 percent.
Claim 11
Dependent Claim
41 words
The web material of claim 9 wherein the acrylic emulsion is made from ethyl acrylate and the nonionic surfactant is a polyol condensation product of ethylene oxide and a hydrophobic base obtained from the reaction of propylene oxide and propylene glycol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |