Adhesives with acoustic damping effect

• US 8,470,928 B2
• Filed: 11/08/2011
• Issued: 06/25/2013
• Est. Priority Date: 05/11/2009
• Status: Expired due to Fees

• Current Assignee: Henkel AG & Co KGaA
• Original Assignee: Henkel AG & Co KGaA
• Inventors: Schumann, Manfred, Kreiner, Kersten
• Primary Examiner(s): MULLIS, JEFFREY C
• Application Number:
  US13/291,418
• Publication Number:
  US 20120115998A1
• Time in Patent Office: 595 Days
• Field of Search: 525/88, 525/92.C, 525/98, 524/589
• US Class Current: 525/88
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/2825 having at least 6 carbon atoms
• CPC Class Codes: C08G 18/307 Atmospheric humidity
• CPC Class Codes: C08G 18/36 Hydroxylated esters of higher fatty acids
• CPC Class Codes: C08G 18/4829 Polyethers containing at least three hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/4854 Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
• CPC Class Codes: C08G 18/6576 Compounds of group C08G18/69
• CPC Class Codes: C08G 18/69 Polymers of conjugated dienes hydrogenated polymers of conjugated dienes C08G18/6208
• CPC Class Codes: C08G 18/715 containing sulfur in addition to isothiocyanate sulfur
• CPC Class Codes: C08G 18/7664 containing alkylene polyphenyl groups
• CPC Class Codes: C08G 18/792 formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
• CPC Class Codes: C08G 2350/00 Acoustic or vibration damping material
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C08L 91/08 Mineral waxes
• CPC Class Codes: C09J 175/04 Polyurethanes

Abstract

A one- or two-component adhesive containing: a) a binding agent having reactive isocyanate groups or silane groups, and b) a nonreactive polymer having a glass transition temperature, measured by means of DSC, in the range from −40° C. to +60° C. This preferably has, in a cured state, at a temperature at least in the range from −10 to +50° C., a dynamic mechanical loss factor tan δ of at least 0.4 at a frequency in the range from 10 to 400 Hz. Use of an adhesive of this kind for the adhesive bonding of components in the manufacture or repair of vehicles, in particular for bonding windows into place in the context of direct glass bonding.

Claims

1. A one- or two-component adhesive comprising:

a) a binding agent having reactive isocyanate groups;

b) a nonreactive polymer comprising unsaturated SIS block copolymers; and

c) a further polymer or resin selected from non-crosslinking polyurethane oligomers.

2. The adhesive according to claim 1, wherein

b) the nonreactive polymer has a glass transition temperature, measured by means of DSC, in a range from −

40°

C. to +60°

C.

3. The adhesive according to claim 1, wherein, in a cured state, at a temperature at least in a range from −

10 to +50°

C., said adhesive has a dynamic mechanical loss factor tan δ

of at least 0.4 at a frequency in a range from 10 to 400 Hz.

4. The adhesive according to claim 1, wherein said adhesive further comprises at least one additive selected from solvents, oils, and plasticizers and combinations thereof, each of said solvents, oils and plasticizers as pure substances at standard pressure, having a boiling point of at least 150°

C.

5. The adhesive according to claim 4, wherein b) is part of a liquid component comprising the at least one additive and is distributed homogeneously in binding agent a).

6. The adhesive according to claim 4, wherein said adhesive contains between 1 wt % and 50 wt %, based on total mass of the adhesive, of said additive.

7. The adhesive according to claim 4, wherein the adhesive further comprises a hydrocarbon resin having a glass transition temperature, measured by means of DSC, that is at least 10°

C. higher than the glass transition temperature of polymer b), but is equal to at least 0°

C.

8. The adhesive according to claim 1, wherein said binding agent a) comprises a binding agent based on polytetrahydrofuran in an amount of at least 10 wt % and not more than 50 wt % based on total mass of the adhesive.

9. The adhesive according to claim 1, wherein c) the non-crosslinking polyurethane oligomers include a non-crosslinking oligomer based on polytetrahydrofuran in a proportion by weight based on total mass of the adhesive of at least 5 wt % and not more than 50 wt %.

10. The adhesive according to claim 9, wherein said binding agent a) comprises a binding agent based on polytetrahydrofuran in an amount of at least 10 wt % and not more than 50 wt % based on total mass of the adhesive;

and said component b) comprises unsaturated SIS block copolymers having a styrene content in a range from 18 to 25 wt %.

11. The adhesive according to claim 1, wherein said adhesive contains, based on total mass of the adhesive, at least 10 wt % and at most 90 wt % binding agent a).

12. The adhesive according to claim 1, wherein said adhesive contains, based on total mass of the adhesive, at least 5 wt % and at most 60 wt % of polymer b).

13. The adhesive according to claim 1 wherein said adhesive further comprises solvents, oils, plasticizers and combinations thereof, in an amount of 10 wt % and 20 wt %, based on total mass of the adhesive, each of said solvents, oils and plasticizers as pure substances at standard pressure, having a boiling point of at least 250°

C.

14. The adhesive according to claim 1, wherein b) is dispersed heterogeneously as particles in binding agent a), said particles having a size distribution such that at least 80 wt % of the particles have a size ranging from 50 μ

m to 300 μ

m.

15. The adhesive according to claim 1, wherein a) the binding agent having reactive isocyanate groups comprises polyurethane prepolymers.

16. The adhesive according to claim 1, wherein b) the unsaturated SIS block copolymers comprise at least one unsaturated styrene-isoprene-styrene block copolymer having a styrene content in a range from 18 to 25 wt %.

17. The adhesive according to claim 1, wherein c) the non-crosslinking polyurethane oligomer is based on polytetrahydrofuran and has a number-average molecular weight ranging from 500 to 5000 g/mol.