US4684558A
Expired / Lapsed
US
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Adhesive polyethylene oxide hydrogel sheet and its production
Assignee: Ludlow Corp
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Filing: 1986-06-30
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Granted: 1987-08-04
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Expires: 2006-06-30
Abstract
Abstract A solid sheet of adhesive hydrophilic gel which is a homogeneous aqueous mixture, substantially free of unbound water, monomers and crosslinking agents, consisting essentially of an amount dispersed uniformly in water of from about 4 to 35 wt % of a crosslinked polyethylene oxide, effective to form with the water a tacky surfaced viscoelastic solid which sheet of hydrophilic gel is produced by subjecting a liquid film of an aqueous solution having a viscosity of about 2-2,000×10 3 cps of a linear water soluble polyethylene oxide having a weight average molecular weight from about 0.02-6×10 6 Daltons to an amount of high energy radiation effective to convert the liquid film to a sheet of the viscoelastic solid having an adhesive face.
Inventors
- 👤 Preston Keusch
- 👤 John L. Essmyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:55
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; C09; C09J; C09J7/00; C09J7/10; C08J2371/00; C08J2371/02; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1424
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
147 words
A method for producing an adhesive sheet of hydrophilic gel which comprises the step of subjecting a liquid film of an aqueous solution having a viscosity of about 2-2,000×10 3 cps of a linear water soluble polyethylene oxide having a weight average molecular weight from about 0.02-6×10 6 Daltons, to an amount of high energy radiation from about 0.2 to 5.0 Mrads effective to convert the liquid film to a sheet of the viscoelastic solid having an adhesive face which in the rolling ball tack test gives a rolling ball distance of less than about 10 mm and gives an adhesion energy force in the Adhesion Energy Density Determination Test of about 2 to 80 g-cm/cm 2 , which adhesive sheet has greater cohesive strength than adhesive strength, whereby the sheet can be removed from a surface to which it is affixed without leaving a visible residue.
Claim 2
Independent Claim
147 words
A method for producing an adhesive sheet of hydrophilic gel which comprises the step of subjecting a liquid film of an aqueous solution having a viscosity of about 2-2,000×10 3 cps of a linear water soluble polyethylene oxide having a weight average molecular weight from about 0.02-6×10 6 Daltons, to an amount of high energy radiation from about 0.2 to 5.0 Mrads effective to convert the liquid film to a sheet of the viscoelastic solid having an adhesive face which in the rolling ball tack test gives a rolling ball distance of less than about 10 mm and gives an adhesion energy force in the Adhesion Energy Density Determination Test of about 2 to 80 g-cm/cm 2 , which adhesive sheet has greater cohesive strength than adhesive strength, whereby the sheet can be removed from a surface to which it is affixed without leaving a visible residue.
Claim 3
Dependent Claim
77 words
A solid sheet from about 10 to 150 mils thick of an adhesive hydrophilic gel which is a homogenous aqueous mixture, substantially free of unbound water, monomers and crosslinking agents, consisting essentially of an amount dispersed uniformly in water of from about 4 to 35 wt % of a crosslinked polyethylene oxide, effective to form with the water a tacky surfaced viscoelastic solid, which sheet of hydrophilic gel is produced according to the process of claim 1.
Claim 4
Dependent Claim
20 words
A sheet of hydrophilic gel according to claim 2, wherein the hydrophilic gel contains immersed therein a low area-weight scrim.
Claim 5
Dependent Claim
18 words
A sheet of hydrophilic gel according to claim 3, wherein the scrim is a sheet of non-woven polyethylene.
Claim 6
Dependent Claim
26 words
A sheet of hydrophilic gel according to claim 2, wherein the concentration of the polyethylene oxide in the hydrogel is about 4 to 35 wt %.
Claim 7
Dependent Claim
26 words
A sheet of hydrophilic gel according to claim 2, wherein the concentration of the polyethylene oxide in the hydrogel is about 7 to 20 wt %.
Claim 8
Dependent Claim
24 words
A sheet of hydrophilic gel according to claim 2, wherein the polyethylene oxide has a molecular weight of about 0.5 to 5×10 6 Daltons.
Claim 9
Dependent Claim
28 words
A sheet of hydrophilic gel according to claim 2, wherein the high energy radiation employed to produce the crossslinked polyethylene oxide is a flux of high energy electrons.
Claim 10
Dependent Claim
27 words
A sheet of hydrophilic gel according to claim 2, wherein the exposed surface of the sheet is covered by a backing sheet which is peelably removable therefrom.
Claim 11
Dependent Claim
60 words
A sheet of hydrophilic gel according to claim 2, wherein the hydrophilic gel contains immersed therein a low area-weight scrim; wherein the polyethylene oxide has a molecular weight of about 0.5 to 5×10 6 Daltons and is present in the hydrophilic gel at a conoentration of about 4 to 12%; and wherein the exposed sheet which is peelably removable therefrom.
Claim 12
Dependent Claim
19 words
A sheet of hydrophilic gel according to claim 10, wherein the scrim formed of a sheet of non-woven polyethylene.
Claim 13
Dependent Claim
18 words
A sheet of hydrophilic gel according to claim 1, wherein the hydrophilic gel contains an electrolyte dissolved therein.
Claim 14
Dependent Claim
28 words
A sheet of hydrophilic gel according to claim 1, wherein the electrolyte is a water soluble salt present in a concentration of about 0.1 to 15 wt %.
Claim 15
Dependent Claim
20 words
A sheet of hydrophilic gel according to claim 13, wherein the water soluble salt is potassium chloride or sodium chloride.
References Cited (Backward Citations)
US4524087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |