Pressure-sensitive adhesive dispersion comprising polymers with ureido groups or ureido-analogous groups and with glycidyl groups

Patent metadata

Field	Value
Publication number	US-9587144-B2
Application number	US-201213443284-A
Country	US
Kind code	B2
Filing date	Apr 10, 2012
Priority date	Apr 15, 2011
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A description is given of a pressure-sensitive adhesive dispersion comprising a water-dispersed polymer P1 formed by emulsion polymerization. The polymer P1 is formed from a monomer mixture comprising (a) at least 40% by weight of C4 to C20 alkyl (meth)acrylates which when polymerized as homopolymers have a glass transition temperature of −30° C. or less, (b) at least 0.05% by weight of (meth)acrylate monomers having a substituent of the formula

where X is CH 2 , O, NH or NR and R is a C1 to C4 alkyl group, (c) at least 0.1% by weight of acid monomers. The monomer mixture comprises alternatively at least 0.05% by weight of glycidyl (meth)acrylate and/or the pressure-sensitive adhesive dispersion comprises at least one further polymer P2 which contains glycidyl groups.

First claim

The invention claimed is:

1. A pressure-sensitive adhesive dispersion, comprising a water-dispersed polymer P1 formed by emulsion polymerization from a monomer mixture comprising:
75 to 90% by weight of n-butyl acrylate;
more than 1% by weight and up to 3% by weight of ureidoethyl methacrylate;
0.5 to 2% by weight of (meth)acrylic acid;
1 to 3% by weight of hydroxypropyl acrylate;
0.1 to 2% by weight of glycidyl methacrylate; and
2 to 20% by weight of at least one additional monomer selected from the group consisting of methyl methacrylate and styrene,
wherein:
monomer amounts are based in each case on a sum of all monomers;
a pressure-sensitive adhesive, formed by coating a PET carrier with the pressure-sensitive adhesive dispersion and drying, exhibits a shear strength value at 70° C. of more than 100 hours for 25×25 mm test strips of the coated PET carrier adhered to steel; and
the pressure-sensitive adhesive exhibits an SAFT-test value of more than 180° C. for the 25×25 mm test strips of the coated PET carrier adhered to the steel.

2. The pressure-sensitive adhesive dispersion according to claim 1 , wherein the monomer mixture further comprises an additional monomer selected from the group consisting of a C1 to C20 alkyl (meth)acrylate, which is different from the n-butyl acrylate, a C1 to C20 hydroxyalkyl (meth)acrylate which is different from the hydroxypropyl acrylate, a vinyl ester of a carboxylic acid comprising up to 20 C atoms, a vinylaromatic having up to 20 C atoms, an ethylenically unsaturated nitrile, a vinyl halide, a vinyl ether of an alcohol comprising 1 to 10 C atoms, an aliphatic hydrocarbon having 2 to 8 C atoms and one or two double bonds, and a mixture thereof.

3. The pressure-sensitive adhesive dispersion according to claim 1 , wherein the pressure-sensitive adhesive dispersion further comprises an additive selected from the group consisting of a filler, a dye, a flow control assistant, a thickener, a defoamer, a plasticizer, a pigment, a wetting agent, a UV protectant, and a tackifier.

4. The pressure-sensitive adhesive dispersion according to claim 1 , further comprising a polymer P2, which is formed by polymerization from a monomer mixture, and the polymer P2 comprises:
at least 60% by weight of a C4 to C20 alkyl (meth)acrylate;
at least 0.1% by weight of a acid monomer;
glycidyl methacrylate; and
optionally an additional monomer selected from the group consisting of a C1 to C20 alkyl (meth)acrylate, which is different from the C4 to C20 alkyl (meth)acrylate, a C1 to C20 hydroxyalkyl (meth)acrylate, a vinyl ester of a carboxylic acid comprising up to 20 C atoms, a vinylaromatic having up to 20 C atoms, an ethylenically unsaturated nitrile, a vinyl halide, a vinyl ether of an alcohol comprising 1 to 10 C atoms, an aliphatic hydrocarbon having 2 to 8 C atoms and one or two double bonds, and a mixture thereof.

5. The pressure-sensitive adhesive dispersion according to claim 1 , wherein:
the polymer P1 is prepared by a process comprising a first polymerizing and a second polymerizing;
an amount of the ureidoethyl methacrylate in the first polymerizing is greater than amounts of the glycidyl methacrylate; and
in the second polymerizing, the amount of the ureidoethyl methacrylate is less than the amount of the glycidyl methacrylate.

6. The pressure-sensitive adhesive dispersion of claim 1 , comprising the water-dispersed polymer P1 formed by emulsion polymerization from a monomer mixture consisting essentially of:
75 to 90% by weight of the n-butyl acrylate;
more than 1% by weight and up to 3% by weight of the ureidoethyl methacrylate;
0.5 to 2% by weight of the (meth)acrylic acid;
1 to 3% by weight of the hydroxypropyl acrylate;
0.1 to 2% by weight of the glycidyl methacrylate; and
2 to 20% by weight of the at least one additional monomer selected from the group consisting of the methyl methacrylate and the styrene.

7. An adhesive tape, comprising a carrier layer, wherein the carrier layer is coated on one or both sides with at least one of the pressure-sensitive adhesive dispersion according to claim 1 .

8. The adhesive tape according to claim 7 , wherein an applied weight of the pressure-sensitive adhesive dispersion, based on solids content, is at least 30 g/m 2 .

9. The adhesive tape according to claim 7 , wherein either:
the carrier layer is selected from the group consisting of polyethylene, oriented polypropylene, polyethylene terephthalate, PE foam, and polyurethane foam, or
the adhesive tape comprises a detachable protective layer lining a layer of adhesive,
or both.

10. A method for producing a self-adhesive article, the method comprising producing the self-adhesive article with the pressure-sensitive adhesive dispersion according to claim 1 .

11. A method for fixing a component for an electronics article or in a construction application, the method comprising fixing the component with the pressure-sensitive adhesive dispersion according to claim 1 .

12. The method according to claim 11 , wherein the component is suitable for automobile construction.

13. A method for fixing a component for an electronics article or in a construction application, the method comprising fixing the component with the adhesive tape according to claim 7 .

14. The method according to claim 13 , wherein the component is suitable for automobile construction.

15. A pressure-sensitive adhesive dispersion, comprising a water-dispersed polymer P1 formed by emulsion polymerization from a monomer mixture comprising:
80.4 to 87.6% by weight of n-butyl acrylate;
1.56 to 1.75% weight of ureidoethyl methacrylate;
1.5 to 1.6% by weight of (meth)acrylic acid;
1.56 to 1.96% by weight of hydroxypropyl acrylate;
1 to 2% by weight of glycidyl methacrylate; and
5.5 to 12.9% by weight of at least one additional monomer selected from the group consisting of methyl methacrylate and styrene,
wherein:
monomer amounts are based in each case on a sum of all monomers;
a pressure-sensitive adhesive, formed by coating a PET carrier with the pressure-sensitive adhesive dispersion and drying, exhibits a shear strength value at 70° C. of more than 100 hours for 25×25 mm test strips of the coated PET carrier adhered to steel; and
the pressure-sensitive adhesive exhibits an SAFT-test value of more than 180° C. for the 25×25 mm test strips of the coated PET carrier adhered to the steel.

Assignees

• Gerst Matthias
• Wulff Dirk
• Harrer Heinrich
• Basf Se

Inventors

• Gerst Matthias
• Wulff Dirk
• Harrer Heinrich

Classifications

• C09J7/385

  Acrylic polymers · CPC title

• Y10T428/287

  including epoxy group or epoxy polymer · CPC title

• C09J139/04

  Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member · CPC title

• C09J133/066

  containing -OH groups · CPC title

• C09J133/12

  Homopolymers or copolymers of methyl methacrylate · CPC title