Patent EP0271292A2 successfully refreshed from Google Patents.
EP0271292A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Adhesives, their preparation and use
Assignee: Smith and Nephew PLC
•
Filing: 1987-12-03
•
Granted: —
•
Expires: 2007-12-03
Abstract
Abstract ADHESIVES, THEIR PREPARATION AND USE Skin friendly pressure sensitive adhesives in the form of inherently tacky polyurethane-containing gells may be prepared by reacting an isocyanate prepolymer, which is itself the reaction product of poly-functional isocyanate and polyoxyalkylene diol monoalkyl ether, with a hydroxyl-containing ester of acrylic or methacrylic acid and optionally other hydroxyl containing compounds and then cross-linking the polymer so formed by means of irradiation. The proportion of acrylate chosen is such that it will react with at least 15 to 25% of the free isocyanate groups in the prepolymer and the remainder react with the other hydroxyl containing compound. The adhesives are capable of absorbing up to 95%, typically from 35 to 95% by weight of water when hydrated. The use of the adhesive in highly moisture vapour permeable dressings is also disclosed.
Inventors
- 👤 Christopher Wilson Guy Ansell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/671; C08G18/672; A; A61; A61B; A61B46/00; A61B46/40; A61F; A61F13/00; A61F13/02; A61F13/023; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; C08G18/2805; C08G18/2815; C08G18/283; A61B46/20; A61B2046/205; A61F2013/00361; A61F2013/00365; A61F2013/00412; C08G2170/00; C08G2170/40; C08G2210/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
31 words
A skin friendly pressure sensitive adhesive suitable for use on skin which comprises an inherently tacky polyurethane gel which adhesive contains both polyurethane and acrylate residues and which is not self-adherent.
Claim 2
Dependent Claim
31 words
A skin friendly pressure sensitive adhesive suitable for use on skin which comprises an inherently tacky polyurethane gel which adhesive contains both polyurethane and acrylate residues and which is not self-adherent.
Claim 3
Dependent Claim
19 words
An adhesive as claimed in claim 1 in which contains up to 95% by weight of water when hydrated.
Claim 4
Dependent Claim
22 words
An adhesive as claimed in claim 2 in which the adhesive contains from 35 to 95% by weight of water when hydrated.
Claim 5
Dependent Claim
91 words
An adhesive as claimed in any one of claims 1 to 4 in which the adhesive is a cross-linked reaction product of an isocyanate prepolymer, which is itself the reaction product of polyfunctional isocyanate and polyoxylalkylene diol monoalkylether, with an acrylate comprising hydroxyl-containing ester of acrylic or methacrylic acid and at least one other hydroxyl containing compound whereby the proportion of the acrylate is such that it reacts with from 15 to 25% of the free isocyanate groups in the prepolymer, the other hydroxyl - containing compound reacting with the remainder.
Claim 6
Dependent Claim
38 words
An adhesive as claimed in claim 4 in which the acrylate is selected from the group consisting of hydroxyethyl methacrylate and methacrylate-mono-esters of polyoxyalkylene diols in which the number of repeating ether units is from 1 to 25.
Claim 7
Dependent Claim
47 words
An adhesive as claimed in either of claims 4 or 5 in which in the polyoxyalkylene diol monoalkyl ether the alkyl group contains from 2 to 6 carbon atoms and the polyoxylaklylene comprises a mixture of polyoxyethylene and polyoxypropylene in a ratio of from 20:80 to 80:20.
Claim 8
Dependent Claim
23 words
An adhesive as claimed in either of claims 3 or 5 in which the polyisocyanate has a functionality of from 2.2 to 3.5.
Claim 9
Dependent Claim
20 words
An adhesive as claimed in claim 4 in which the said other hydroxyl containing compound is polyoxyalkylene diol monoalkyl ether.
Claim 10
Dependent Claim
19 words
An adhesive as claimed in claim 4 in which the said other hydroxyl containing compound is a tackifying resin.
Claim 11
Dependent Claim
16 words
An adhesive as claimed in claim 9 in which the tackifying resin is hydrogenated abietyl alcohol.
Claim 12
Dependent Claim
15 words
An adhesive according to any of the preceding claims having a mechanical agent incorporated herein.
Claim 13
Dependent Claim
94 words
A process for the preparation of a skin friendly pressure sensitive adhesive in the form of an inherently tacky polyurethane gel which process comprises reacting an isocyanate prepolymer, which is itself the reaction product of polyfunctional isocyanate and polyoxyalkylene diol monoalkyl ether, with acrylate comprising a hydroxyl - containing ester of acrylic or methacrylic acid in which the proportion of the acrylate is such that the hydroxyl groups contained therein will react with from 15 to 25% of the free isocyanate groups in the prepolymer and cross-linking the polymer formed by means of irradiation.
Claim 14
Dependent Claim
94 words
A process for the preparation of a skin friendly pressure sensitive adhesive in the form of an inherently tacky polyurethane gel which process comprises reacting an isocyanate prepolymer, which is itself the reaction product of polyfunctional isocyanate and polyoxyalkylene diol monoalkyl ether, with acrylate comprising a hydroxyl - containing ester of acrylic or methacrylic acid in which the proportion of the acrylate is such that the hydroxyl groups contained therein will react with from 15 to 25% of the free isocyanate groups in the prepolymer and cross-linking the polymer formed by means of irradiation.
Claim 15
Dependent Claim
25 words
A process acording to claim 11 in which at least one other hydroxyl-containing compound is also present to react with the remaining free isocyanate group.
Claim 16
Dependent Claim
19 words
A process according to claim 13 in which the other hydroxyl - containing compound is polyoxyalkylene diol monoalkyl ether.
Claim 17
Dependent Claim
18 words
A process according to claim 13 in which the other hydroxyl - containing compound is hydrogenated abietyl alcohol.
Claim 18
Dependent Claim
16 words
An adhesive product comprising an adhesive as claimed in any one of claims 1 to 11.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.