EP0942941A1 - Adhesives - Google Patents
AdhesivesInfo
- Publication number
- EP0942941A1 EP0942941A1 EP97947177A EP97947177A EP0942941A1 EP 0942941 A1 EP0942941 A1 EP 0942941A1 EP 97947177 A EP97947177 A EP 97947177A EP 97947177 A EP97947177 A EP 97947177A EP 0942941 A1 EP0942941 A1 EP 0942941A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cross
- linked polyurethane
- linked
- diamine
- isocyanate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/83—Chemically modified polymers
- C08G18/834—Chemically modified polymers by compounds containing a thiol group
- C08G18/835—Unsaturated polymers modified by compounds containing a thiol group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/83—Chemically modified polymers
- C08G18/833—Chemically modified polymers by nitrogen containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2170/00—Compositions for adhesives
- C08G2170/40—Compositions for pressure-sensitive adhesives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2210/00—Compositions for preparing hydrogels
Definitions
- the present invention relates to adhesives, their preparation and their use.
- Adhesives which are suitable for use on the skin and which comprise polyurethane polymers are known from European Patent No.0271292B1.
- Adhesives described therein are prepared by reacting an isocyanate precursor with an acrylate comprising hydroxyl-containing esters of acrylic or methacrylic acid to produce a prepolymer.
- the prepolymer so formed may be cross-linked to form a polyurethane polymer by irradiation.
- prior art cross- linked polyurethane systems tend to be sensitive to water and when in contact with water produce carbon dioxide which results in bubbles appearing in gels.
- isocyanate precursors may be reacted with hydroxylated alkyl acrylates to produce a non-cross linked polyurethane hereinafter referred to as the prepolymer.
- prepolymers may then be reacted with a polyamine (i.e. polymer with amine groups) or a disulphide to produce a cross-linked polyurethane.
- polyurethane wherein the polyurethane comprises an acrylated isocyanate cross-linked with polyamine or polysulphide groups.
- cross-linked polyurethanes according to the invention are advantageous in that they provide a skin friendly non-self adherent pressure sensitive adhesive which is inherently tacky.
- the cross-linked polyurethane of the invention absorbs water, eg. from 5 to 95% of the weight of the cross-linked polyurethane, to form a polyurethane gel.
- the cross-linked polyurethane will absorb water and become hydrated and when hydrated may contain up to 95%, typically from 35 to 95% by weight of water, aptly 50% to 92%, preferably 70 to 90% by weight of water and most preferably 75 to 85% by weight of water.
- the water absorption of the cross-linked polyurethane can be obtained by taking a known weight of the cross-linked polyurethane and immersing it in water for 24 hours.
- the resulting polyurethane gel is removed from the water, surface water is removed by lightly blotting with absorbent paper and then the weight of the polyurethane gel is taken. The water absorption of the cross-linked polyurethane (% by weight) can then be calculated.
- the polyurethane gels are also suited to providing skin friendly non-self adherent pressure sensitive adhesives and such adhesives are a further feature of the present invention.
- a skin friendly non-self adherent pressure sensitive adhesive which comprises a cross-linked polyurethane wherein the polyurethane comprises an acrylated isocyanate which is cross-linked with polyamine or disulphide groups.
- the adhesives of the invention are skin friendly, ie. that they can be removed from the skin without causing discomfort and because of their inherent tackiness can be replaced and adhere again.
- the adhesives also have the advantage that they are non- self-adherent so that if for example the adhesive surface becomes creased during the application of a dressing the contracting surfaces of the adhesive may be easily peeled apart and the dressing is not wasted.
- isocyanate precursors known ⁇ e ⁇ ⁇ e_ may be used, but the preferred isocyanate precursors are those described in European Patent No.0271292B.
- the non-cross-linked polyurethane may be prepared using one or more hydroxy alkyl acrylates.
- the alkyl group may be C1 to 10, preferably C1 to 6, eg. ethyl.
- polyamines or disulphides act as cross-linking agents when reacted with the prepolymer.
- preferred polyamines are diamines. Any diamines known Q ⁇ L se may be used such as alkyl C1 to 10 diamines such as ethylene diamine. Preferred diamines are the class of compounds known as Jeffamines (Trade Mark) available from Huntsman Corporation in the UK.
- Jeffamines are high molecular weight diamines with a polymeric backbone. Jeffamines may have a molecular weight ranging from 200 to 6000.
- the Jeffamine ED-Series products are polyether diamines which are based on a predominately polyethylene oxide backbone. This imparts complete water solubility to each of the members of this series.
- the Jeffamine ED-Series products have the following structure:
- the Jeffamine DU Series are urea condensates of Jeffamine D-Series products.
- the DU-Series products are made by coupling a Jeffamine D-Series product with urea, in order to form a diamine product of increased molecular weight. This is exemplified by the following structure:
- Preferred disulphides are polysulphides of the following general structure:
- Such polysulphides are known per ⁇ e_ and are available from Morton International, Speciality Chemicals Group in the UK.
- the cross-linking reaction may be promoted by the presence of an effective amount of catalyst.
- the present invention also provides a method of preparation of cross-linked polyurethane as hereinbefore described, which comprises; (i) reacting an isocyanate with an hydroxylated acrylate to produce a prepolymer; and
- the present invention also provides a process for the preparation of a pressure sensitive adhesive in the form of an inherently tacky polyurethane gel which comprises hydrating a cross-linked polyurethane as hereinbefore described with from 5 to 95% w/w of water.
- the present invention provides adhesive products comprising an adhesive gel in accordance with the invention.
- the adhesives of the present invention are suitable for use in a number of applications such applications include use as an adhesive when coated on a substrate for bandages, absorbent wound dressings, burns dressings, incise drapes, first aid dressings, intravenous catheter dressing, ostomy devices, condom attachment in urinary incontinence devices, transdermal drug delivery devices, adhesive tapes (surgical tapes, wound closure tapes and the like), protection devices such as napkins, diapers, incontinence pads and protection pads, electroconductive gels.
- adhesive tapes surgical tapes, wound closure tapes and the like
- protection devices such as napkins, diapers, incontinence pads and protection pads
- electroconductive gels electroconductive gels.
- the main use is envisaged to be in dressings and drapes of the types above when the adhesive is in contact with the skin.
- the adhesives of the invention may be employed in the manufacture of bacteria proof wound dressings such as those which comprise a backing layer which has upon substantially the whole of the wound facing surface thereof a layer of pressure sensitive adhesive in accordance with the invention.
- cross-linked polyurethanes of the invention are advantageous in that they may be prepared without the need of a radical initiator or a UV irradiation source.
- agents may be incorporated into the adhesives of the present invention.
- agents it is meant pharmacologically active agents and agents including topical anaesthetics such as amethocaine, xylocaine, bact ⁇ riostatic agents such as silver nitrate; antibacterial agents of which preferred agents include silver sulphadiazine, chlorhexidine salts, PVP-I, and biguanides antibiotics; topical steroids, enzyme stimulants, coagulants and anticoagulants and antifungal agents.
- water soluble medicaments such as chlorhexidine and its salts may be dissolved in water which is used to hydrate the cross-linked polyurethane. It is found that chlorhexidine is unaffected during the hydrating process and the resulting adhesive provides effective release of chlorhexidine when placed onto a surface.
- Emkarox VG680W (0.280 moles OH from H2O and OH values)
- 175g Desmodur N3200 (NCO/OH ratio 3.5)
- 0.2% w/w Metatin 812ES catalyst were mixed in a 1 litre flange flask on a water bath at 80° for 2 hours.
- the percentage isocyanate in the resulting prepolymer was determined in the standard way and was found to be 2.97% w/w NCO in this case.
- Other prepolymers were synthesised which were formulated to give different residual isocyanate concentrations. This would be expected to affect the degree of cross-linking in the gel adhesive.
- the residual isocyanate functionalities in the prepolymer were reactecj, for example, with hydroxyethylacrylate in order the synthesise the acrylated prepolymer.
- the isocyanate/hydroxyethylacrylate reaction was performed at a 1 :1 NCO/OH mole ratio.
- the two components were stirred at room temperature for approx 6 hours and the disappearance of isocyanate was monitored by infra-red spectroscopy.
- Infra-red spectra of isocyanate terminated prepolymers contain a strong isocyanate peak at 2270cm -' ' .
- the Michael addition was performed by mixing equimolar ratios of acrylate groups to amine (or thiol) functionalities. This reaction generally proceeds more quickly at room temperature than at elevated temperatures. Catalysts were added, where applicable, dropwise to the two component mixture.
- Emkarox VG680W, polyisocyanate and Metatin 812ES catalyst were weighed into a flange flask fitted with a stirrer, nitrogen inlet and bubbler. This was stirred at 80°C for 2 hours under nitrogen and then allowed to cool to room temperature. The oligomer was then mixed, at room temperature, stoichiometrically with hydroxyacrylate to cap-off the remaining isocyanate groups. The reaction mix was then analysed periodically by infra-red spectroscopy to monitor the disappearance of the isocyanate peak at 2250cm "1 . The prepolymer stored at room temperature after synthesis in a sealed container.
- the polyol: isocyanate ratio was such to give a suitable number of acrylate groups which could be effectively crosslinked to give a tacky gel.
- the isocyanate content of the prepolymer varied between 0.64% and 2.5% and was dependant on the isocyanate and end-capping acrylate (see Table 1).
- a sample of acrylate terminated prepolymer was mixed in a 1 : 1 vinyl:NH (or NH 2 , depending on the sample) ratio with the crosslinker and poured into a tray and left to gel via the Michael Addition reaction.
- Hydroxyethylacrylate capped Desmodur N3200 - derived prepolymer (PC0896039) was crosslinked with a range of amines of different molecular weight and functionality. These took between V 2 hour and 5 days to give a tacky clear (some bubbles present from mixing), gel. The lower molecular weight amines crosslinked first (1 ,3-diaminopropane) and higher molecular weight last (Jeffamine D2000). All of these gels when placed in water dissolved in 13 - 48 hours. Only Versalink P650 did not gel the prepolymer successfully. When polysulphide was used as a crosslinker this gave a gel in 3 days and did not dissolve in water, but gave a 71% water uptake.
- Hydroxyethylacrylate capped Suprasec 5005 - derived prepolymer (PC0896173) was crosslinked with Jeffamine D2000 and N.N-dimethylethylenediamine and gave a tacky clear gel in less than three days. Both of these gels when placed in water dissolved in five days.
- Hydroxypropylacrylate capped Desmodur prepolymer (PC1196045) was crosslinked with Jeffamine D2000 to give a tacky gel which dissolved in water in several days.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Materials For Medical Uses (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9625422.2A GB9625422D0 (en) | 1996-12-06 | 1996-12-06 | Adhesives |
GB9625422 | 1996-12-06 | ||
PCT/GB1997/003340 WO1998024826A1 (en) | 1996-12-06 | 1997-12-04 | Adhesives |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0942941A1 true EP0942941A1 (en) | 1999-09-22 |
Family
ID=10804079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97947177A Withdrawn EP0942941A1 (en) | 1996-12-06 | 1997-12-04 | Adhesives |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0942941A1 (ja) |
JP (1) | JP2001505245A (ja) |
AU (1) | AU5232698A (ja) |
CA (1) | CA2273962A1 (ja) |
GB (1) | GB9625422D0 (ja) |
WO (1) | WO1998024826A1 (ja) |
ZA (1) | ZA9710860B (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2421720T3 (es) | 1999-04-12 | 2013-09-05 | Genentech Inc | Homólogos del factor de necrosis tumoral y ácidos nucleicos que los codifican |
JP4716603B2 (ja) * | 2001-05-30 | 2011-07-06 | 日東電工株式会社 | 再剥離性粘着剤組成物及び再剥離用粘着シート |
EP1418925A4 (en) * | 2001-07-31 | 2009-09-02 | Tyco Healthcare | BIOLOGICALLY RESORBABLE ADHESIVE COMPOSITIONS AND COMPOSITIONS |
JP2017145276A (ja) * | 2016-02-15 | 2017-08-24 | 日東電工株式会社 | ポリサルファイド系粘着テープ |
FR3078339B1 (fr) * | 2018-02-23 | 2020-01-24 | Bostik Sa | Composition a base de polyurethane comprenant au moins deux fonctions acrylique |
KR102135577B1 (ko) * | 2018-12-19 | 2020-07-20 | 전자부품연구원 | Uv 경화형 올리고머, 그의 제조 방법, 그를 포함하는 uv 경화형 점착제 및 점착 테이프 |
EP3738990A1 (de) * | 2019-05-15 | 2020-11-18 | Covestro Deutschland AG | Polyurethanschaumstoffe mit erniedrigtem cold-flow-effekt und verfahren zu deren herstellung |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1462730A (en) * | 1974-11-11 | 1977-01-26 | Prod Res & Chem Corp | Mercaptan-terminated polymers and cured polymers derived there from |
JPS5736115A (en) * | 1980-08-12 | 1982-02-26 | Mitsui Tekisako Chem Kk | Curing agent composition for polyurethane |
CA1213396A (en) * | 1982-09-16 | 1986-10-28 | Fernando E. Blanco | .alpha.-.beta. UNSATURATED UREIDE POLYMERS, METHOD FOR MAKING SAME AND CURED ELASTOMERS PRODUCED THEREFROM |
US4822841A (en) * | 1987-10-06 | 1989-04-18 | Desoto, Inc. | Strong and elastic polyurethane, polyurea, polyarylates and electron beam-cured coatings containing the same |
US5306764A (en) * | 1992-09-03 | 1994-04-26 | China Technical Consultants Inc. | Water dispersible polyurethane and process for preparation thereof |
US5426157A (en) * | 1994-03-16 | 1995-06-20 | Air Products And Chemicals, Inc. | Flexibilized polyepoxide resins incorporating poly-N-methylated secondary amines |
-
1996
- 1996-12-06 GB GBGB9625422.2A patent/GB9625422D0/en active Pending
-
1997
- 1997-12-03 ZA ZA9710860A patent/ZA9710860B/xx unknown
- 1997-12-04 EP EP97947177A patent/EP0942941A1/en not_active Withdrawn
- 1997-12-04 WO PCT/GB1997/003340 patent/WO1998024826A1/en not_active Application Discontinuation
- 1997-12-04 JP JP52535498A patent/JP2001505245A/ja active Pending
- 1997-12-04 AU AU52326/98A patent/AU5232698A/en not_active Abandoned
- 1997-12-04 CA CA002273962A patent/CA2273962A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9824826A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2273962A1 (en) | 1998-06-11 |
JP2001505245A (ja) | 2001-04-17 |
WO1998024826A1 (en) | 1998-06-11 |
GB9625422D0 (en) | 1997-01-22 |
ZA9710860B (en) | 1998-06-08 |
AU5232698A (en) | 1998-06-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19990607 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
17Q | First examination report despatched |
Effective date: 20000406 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SMITH & NEPHEW PLC |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20010410 |