US4952618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocolloid/adhesive composition
Assignee: 3M Co
•
Filing: 1988-05-03
•
Granted: 1990-08-28
•
Expires: 2008-05-03
Abstract
Abstract Hydrocolloid adhesive compositions are disclosed comprising a rubbery elastomeric base having dispersed therein hydrocolloid particles, at least some of which are polycationic hydrocolloid particles. The compositions have enhanced resistance to breakdown by body fluids and are especially useful as wound dressings.
Inventors
- 👤 Roger A. Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:41
CPC Classifications
A; A61; A61L; A61L24/00; A61L24/04; A61L24/043; A61F; A61F13/00; A61F13/02; A61F13/023; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61L15/585; A61L15/60; C; C09; C09J; C09J121/00; A61F2013/00361; A61F2013/00544; A61F2013/00604; A61F2013/00727; A61F2013/00748; A61F2013/00757; A61F2013/00795; A61F2013/00817; A61F2013/00829; A61F2013/00846; A61F2013/00855; A61F2013/00868; A61F2013/00876; A61F2013/00902; A61F2013/00978; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/26
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
50 words
A pressure sensitive adhesive composition comprising a rubbery elastomer having dispersed therein water absorbable or swellable hydrocolloid particles wherein at least some of said hydrocolloid particles are polycationic hydrocolloid particles, said composition having an Integrity Value of at least 60 percent and an Absorbency Value of at least 180 percent.
Claim 2
Dependent Claim
50 words
A pressure sensitive adhesive composition comprising a rubbery elastomer having dispersed therein water absorbable or swellable hydrocolloid particles wherein at least some of said hydrocolloid particles are polycationic hydrocolloid particles, said composition having an Integrity Value of at least 60 percent and an Absorbency Value of at least 180 percent.
Claim 3
Dependent Claim
25 words
The adhesive composition of claim 1 wherein said polycationic hydrocolloid is selected from the group consisting of a chitosan salt, DEAE Dextran and mixtures thereof.
Claim 4
Dependent Claim
15 words
The adhesive composition of claim 2 wherein said polycationic hydrocolloid is a water-soluble chitosan salt.
Claim 5
Dependent Claim
16 words
The adhesive composition of claim 1 wherein said hydrocolloid particles comprise at least one polyanionic hydrocolloid.
Claim 6
Dependent Claim
11 words
The adhesive composition of claim 4 further comprising a neutral hydrocolloid.
Claim 7
Dependent Claim
12 words
The adhesive composition of claim 5 wherein said neutral hydrocolloid is gelatin.
Claim 8
Dependent Claim
23 words
The adhesive composition of claim 4 wherein said polyanionic hydrocolloid is selected from the group consisting of pectin, sodium carboxymethylcellulose and mixtures thereof.
Claim 9
Dependent Claim
20 words
The adhesive composition of claim 6 wherein the polycationic hydrocolloid is a chitosan salt and said polyanionic hydrocolloid is pectin.
Claim 10
Dependent Claim
26 words
The adhesive composition of claim 1 wherein said polycationic hydrocolloid is present in an amount between 15 and 25 percent by weight of the adhesive composition.
Claim 11
Dependent Claim
12 words
The adhesive composition of claim 1 wherein said rubbery elastomer is polyisobutylene.
Claim 12
Dependent Claim
19 words
The composition of claim 10 wherein said polyisobutylene comprises at least 30 percent by weight of said adhesive composition.
Claim 13
Dependent Claim
41 words
A pressure sensitive adhesive composition comprising a rubbery elastomer having dispersed therein at least 10 percent by weight of a polycationic hydrocolloid powder and at least 10 percent by weight of polyanionic hydrocolloid or a mixture of polyanionic and neutral hydrocolloids.
Claim 14
Dependent Claim
41 words
A pressure sensitive adhesive composition comprising a rubbery elastomer having dispersed therein at least 10 percent by weight of a polycationic hydrocolloid powder and at least 10 percent by weight of polyanionic hydrocolloid or a mixture of polyanionic and neutral hydrocolloids.
Claim 15
Dependent Claim
35 words
The composition of claim 12 comprising about 20 percent by weight of a water soluble chitosan salt and about 40 percent by weight of a polyanionic hydrocolloid or a mixture of polyanionic and neutral hydrocolloids.
Claim 16
Dependent Claim
23 words
The composition of claim 1 having an integrity value of at least 85 percent and an absorbency value of at least 300 percent.
Claim 17
Dependent Claim
25 words
A wound dressing comprising a sheet of the composition of claim 1 and a moisture vapor permeable backing covering one major surface of said sheet.
Claim 18
Dependent Claim
13 words
The wound dressing of claim 15 wherein said backing is a transparent film.
Claim 19
Dependent Claim
14 words
The wound dressing of claim 16 wherein said film comprises polyurethane or porous polyethylene.
Claim 20
Dependent Claim
50 words
The wound dressing of claim 15 wherein said sheet and backing are oval shaped, said backing extends beyond the periphery of the sheet on all sides and said backing contains a pressure sensitive adhesive on at least the portion of the lower surface of the backing extending beyond said sheet.
Claim 21
Dependent Claim
25 words
The wound dressing of claim 18 further comprising a removable delivery sheet attached to the surface of said backing opposite that attached to said sheet.
Claim 22
Dependent Claim
16 words
A method of treating a wound comprising applying to the wound the composition of claim 1.
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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) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |