Processing

Please wait...

Settings

Settings

Goto Application

1. WO2012069587 - WATERBORNE POLYURETHANE ADHESIVE COMPOSITION AND METHOD FOR BONDING ARTICLES

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims:

1. A waterborne dispersion, containing

30.0 - 94.9 wt. % of at least one polymer selected from the group comprising polyurethanes, polyureas and polyurethane polyureas,

5.0 - 60.0 wt. % of at least one monomer which can polymerise by radical polymerisation, 0.1 - 10.0 wt. % of at least one photoinitiator, and

optionally, 0.5 - 15.0 wt. % of at least one crosslinking agent,

wherein the figures in weight percent relate to the solids content and add up to 100, characterised in that when measured by DSC to DIN 65467 at a heating rate of 20K/min, the polymer has a melting peak corresponding to an enthalpy of fusion of > 3 J/g.

2. A waterborne dispersion according to Claim 1, characterised in that the dispersion contains 50 to 90 wt. % of at least one polymer selected from the group comprising polyurethanes, polyureas and polyurethane polyureas.

3. A waterborne dispersion according to Claim 1, characterised in that the dispersion contains 8 to 40 wt. % of at least one monomer which can polymerise by radical polymerisation.

4. A waterborne dispersion according to Claim 1, characterised in that the dispersion contains 0.5 to 8 wt. % of at least one photoinitiator.

5. A waterborne dispersion according to Claim 1, characterised in that the polymer selected from the group comprising polyurethanes, polyureas and polyurethane polyureas has, when measured by DSC to DIN 65467 at a heating rate of 20K/min, a melting peak corresponding to an enthalpy of fusion of > 15 J/g.

6. A waterborne dispersion according to Claim 1, characterised in that the polymer selected from the group comprising polyurethanes, polyureas and polyurethane polyureas has ethylenically unsaturated double bonds.

7. A waterbome dispersion according to Claim 1, characterised in that the monomer which can polymerise by radical polymerisation is selected from the group comprising esters of acrylic acid, esters of methacrylic acid, esters of crotonic acid, vinyl ethers, vinyl esters and vinyl- aromatic compounds.

8. A method according to Claim 1, characterised in that the monomer which can polymerise by radical polymerisation includes aromatic or cycloaliphatic groups.

9. Use of a waterbome dispersion according to one or more of Claims 1 to 8 as a heat-activatable adhesive.

10. A method for bonding articles, including at least the following steps:

I) coating an article with a waterbome dispersion according to one or more of

Claims 1 to 9;

II) removing water;

III) irradiating with actinic radiation;

IV) simultaneously with or after III), introducing heat into the irradiated film; and

V) bringing the article into contact with itself or a further article.

11. A method according to Claim 10, characterised in that the further article in step V) is also coated with a waterbome dispersion according to one or more of Claims 1 to 9 or with another adhesive which is activated by heat.

12. A method according to Claim 10, characterised in that the article has not been treated with a primer before it is coated with a waterbome dispersion according to one or more of Claims 1 to 9.

13. A method according to Claim 10, characterised in that the article has not been pretreated with a plasma or with ozone before it is coated with a waterbome dispersion according to one or more of Claims 1 to 9.

14. A method according to Claim 10, characterised in that the article contains a material selected from the group comprising ethylene vinyl acetate copolymers, rubber such as SBR

(styrene/butadiene rubber), NBR (nitrile/butadiene rubber), TR (thermoplastic rubber), natural rubber, EPDM (ethylene/propylene/diene rubber), polyolefins and other thermoplastic materials and mixtures thereof.

Articles prepared by a method according to Claims 10 to 14.