Method for producing articles coated with adhesive

Patent metadata

Field	Value
Publication number	US-11814558-B2
Application number	US-201916970486-A
Country	US
Kind code	B2
Filing date	Feb 15, 2019
Priority date	Feb 21, 2018
Publication date	Nov 14, 2023
Grant date	Nov 14, 2023

Abstract

Described is a process for producing adhesive-coated articles, wherein an aqueous dispersion adhesive composition comprising a dispersed adhesive polymer and a dissolved polyvinylpyrrolidone is applied at high web speed to a film substrate using a coating machine having at least one rotating roller and wherein the coated film substrate may optionally be bonded to a further substrate. Also described is the use of polyvinylpyrrolidone as a defoamer for aqueous dispersion adhesive compositions applied to a film substrate using a coating machine having a rapidly rotating roller.

First claim

The invention claimed is:

1. A process for producing adhesive-coated articles, comprising:
applying an aqueous dispersion adhesive composition to a film substrate using a coating machine with at least one rotating roller,
wherein the aqueous dispersion adhesive composition comprises
at least one adhesive polymer dispersed in the aqueous phase and
at least one polyvinylpyrrolidone dissolved in the aqueous phase,
wherein the web speed of the film substrate is not less than 150 m/min, and
wherein the coated film substrate is optionally bonded to a further substrate.

2. The process of claim 1 , wherein the adhesive-coated articles are selected from the group consisting of laminates and pressure-sensitive adhesive articles.

3. The process of claim 1 , wherein the adhesive-coated articles are composite films, and
wherein at least two films are bonded to one another using the aqueous dispersion adhesive composition.

4. The process of claim 1 , wherein in the Billhofer foam test measured at 250 m/min, the aqueous dispersion adhesive composition exhibits a value of greater than 120 minutes.

5. The process of claim 1 , wherein the at least one polyvinylpyrrolidone has a K value of 25 to 100 measured at 25° C. as a 1% solution in water.

6. The process of claim 1 , wherein the aqueous dispersion adhesive composition comprises
from 30% to 60% by weight of the at least one adhesive polymer and
from 0.02% to 2% by weight of the at least one polyvinylpyrrolidone, each relative to a total weight of the aqueous dispersion adhesive composition.

7. The process of claim 1 , wherein the at least one adhesive polymer has a glass transition temperature of −40° C. to +15° C., as measured by differential scanning calorimetry at a heating rate of 20° C./min.

8. The process of claim 1 ,
wherein the at least one adhesive polymer is selected from the group consisting of polyurethanes and polymers producible by free-radical emulsion polymerization of ethylenically unsaturated, free-radically polymerizable monomers comprising:
a) at least 60% by weight, based on the total amount of monomers, of at least one monomer selected from the group consisting of C1- to C20-alkyl acrylates, C1- to C20-alkyl methacrylates, vinyl esters of carboxylic acids comprising up to 20 carbon atoms, vinylaromatics having up to 20 carbon atoms, vinyl halides, vinyl ethers of alcohols comprising 1 to 10 carbon atoms, aliphatic hydrocarbons having 2 to 8 carbon atoms and one or two double bonds, and mixtures of these monomers,
b) at least 0.1% by weight, based on the total amount of monomers, of at least one monomer having at least one acid group; and
c) optionally at least one further monomer distinct from the monomers a) and b).

9. The process of claims 8 , wherein the monomers a) are at least one selected from the group consisting of C1- to C10-alkyl acrylates, C1- to C10-alkyl methacrylates, and styrene.

10. The process of claims 8 , wherein the monomers a) are employed in an amount of at least 80% by weight, based on the total amount of the monomers, and are at least one selected from the group consisting of C- to C10-alkyl acrylates, C1- to C10-alkyl methacrylates, styrene, and a mixture thereof; and
wherein the monomers b) are employed in an amount of 0.5% to 5% by weight, based on the total amount of the monomers, and are at least one selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, and a mixture thereof.

11. The process of claim 1 , wherein the at least one adhesive polymer is at least one polyurethane constructed from
a) at least one monomeric diisocyanate,
b) at least one diol, of which
b1) 10 to 100 mol %, based on the total amount of the diols (b), have a molecular weight of 500 to 5000 g/mol and
b2) 0 to 90 mol %, based on the total amount of the diols (b), have a molecular weight of 60 to 500 g/mol,

c) at least one monomer distinct from the monomers (a) and (b) having at least one isocyanate group or at least one isocyanate-reactive group which further bears at least one hydrophilic group or a potentially hydrophilic group, and
d) optionally at least one further compound distinct from the monomers (a) to (c) having at least two reactive groups selected from the group consisting of alcoholic hydroxyl groups, primary amino groups, secondary amino groups, and isocyanate groups, and
e) optionally at least one monofunctional compound distinct from the monomers (a) to (d) having a reactive group which is at least one selected from the group consisting of an alcoholic hydroxyl group, a primary or secondary amino group, and an isocyanate group.

12. The process of claim 11 , wherein:
the at least one monomeric diisocyanate a) is selected from diisocyanates of the formula X(NCO) 2 , wherein X represents at least one selected from the group consisting of an acyclic aliphatic hydrocarbon radical having 4 to 15 carbon atoms, a cycloaliphatic hydrocarbon radical having 6 to 15 carbon atoms, an aromatic hydrocarbon radical having 6 to 15 carbon atoms, and an araliphatic hydrocarbon radical having 7 to 15 carbon atoms;
the diols b1) are selected from the group consisting of polyester diols, polycarbonate diols, and polyether diols; and
the compound c) is selected from the group consisting of dihydroxycarboxylic acids, diaminocarboxylic acids, and diaminosulfonic acids.

13. The process of claims 11 , wherein the content of anionic or potentially anionic groups in the at least one polyurethane is 30 to 1000 mmol/kg of the at least one polyurethane.

14. The process of claim 1 , wherein the at least one adhesive polymer is producible by free-radical emulsion polymerization of ethylenically unsaturated, free-radically polymerizable monomers comprising:
a) 60% to 99.9% by weight, based on the total amount of monomers, of at least one monomer selected from the group consisting of C1- to C20-alkyl acrylates, C1- to C20-alkyl methacrylates, and vinylaromatics having up to 20 carbon atoms; and
b) 0.1% to 5% by weight, based on the total amount of monomers, of at least one monomer having at least one acid group selected from acrylic acid, methacrylic acid, and itaconic acid; and
c) 0% to 10% by weight, based on the total amount of monomers, of further monomers distinct from the monomers a) to b), selected from the group consisting of acrylamide, methacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, phenyloxyethylglycol mono(meth)acrylate, hydroxyl-comprising monomers, amino- comprising monomers, nitriles, alpha,beta-monoethylenically unsaturated C3-C8-carboxylic acids, bifunctional monomers which comprise not only an ethylenically unsaturated double bond but also at least one glycidyl group, bifunctional monomers which comprise not only an ethylenically unsaturated double bond but also at least one oxazoline group, bifunctional monomers which comprise not only an ethylenically unsaturated double bond but also at least one ureido group, bifunctional monomers which comprise not only an ethylenically unsaturated double bond but also at least one ureido-analogous group, and crosslinking monomers having more than one free-radically polymerizable group.

15. The process of claims 1 , wherein the at least one adhesive polymer dispersed in the aqueous phase is a styrene/acrylate copolymer formed from a monomer mixture comprising styrene and at least one monomer selected from the group consisting of C1- to C20-alkyl acrylates and C1- to C20-alkyl methacrylates.

16. The process of claim 1 , wherein the aqueous dispersion adhesive composition comprises water-dispersed polymer particles having an av

Assignees

• Basf Se

Inventors

• Kiener Christoph
• Heckhoff Lars
• Preishuber-Pfluegl Peter
• Bociek Richard

Classifications

• C09J7/385 Primary

  Acrylic polymers · CPC title

• B32B37/1284

  Application of adhesive · CPC title

• B32B37/20

  involving the assembly of continuous webs only · CPC title

• C08L39/06

  Homopolymers or copolymers of N-vinyl-pyrrolidones · CPC title

• C09J133/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title