Primer for adhesive tapes

Patent metadata

Field	Value
Publication number	US-10513634-B2
Application number	US-201515329300-A
Country	US
Kind code	B2
Filing date	Aug 27, 2015
Priority date	Aug 29, 2014
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

Primer for adhesive tape with improved adhesion promoting properties, comprising a mixture G, which is dissolved or dispersed in one or more solvents, consisting of at least one copolymer obtained by copolymerization of a monomer mixture comprising an amount of at least 90 wt % of the following monomers: vinylcaprolactam and/or vinylpyrrolidone; one or more of the monomers a) and/or b): a) acrylic acid ester of a linear, primary alcohol having 2 to 10 carbon atoms in the alkyl group of the alcohol, b) acrylic acid ester of a branched, non-cyclic alcohol having 3 to 12 carbon atoms in the alkyl group, at least one chlorinated polyolefin, and at least one metal compound selected from the group consisting of metal acetylacetonates, metal alkoxides and alkoxy-metal acetylacetonates.

First claim

The invention claimed is:

1. Primer comprising a mixture, in dispersion in one or more dispersants or in solution in one or more solvents, comprising:
at least one copolymer obtained by copolymerizing a monomer mixture comprising:
at least 20 wt % vinylcaprolactam, vinylpyrrolidone, or vinylcaprolactam and vinylpyrrolidone;
one or more acrylic esters of a linear primary alcohol, one or more acrylic esters of a branched acyclic alcohol, or one or more acrylic esters of a linear primary alcohol and one or more acrylic esters of a branched acyclic alcohol;

at least one chlorinated polyolefin; and
at least one metal compound selected from the group consisting of a metal acetylacetonate, a metal alkoxide, and an alkoxy metal acetylacetonate,

wherein:
the total amount of, when present, the vinylcaprolactam, the vinylpyrrolidone, the acrylic esters of a linear primary alcohol, and the one or more acrylic esters of a branched acyclic alcohol in the monomer mixture is at least 90 wt % based on the total weight of the monomer mixture;
the linear primary alcohol comprises 2 to 10 carbon atoms in a first alkyl radical;
the branched acyclic alcohol comprises 3 to 12 carbon atoms in a second alkyl radical; and
the monomer mixture comprises at most 1 wt % acrylic acid based on the total weight of the monomer mixture.

2. Primer according to claim 1 , wherein the at least one copolymer is a pressure-sensitive adhesive.

3. Primer according to claim 1 , wherein the total amount of vinylcaprolactam, the vinylpyrrolidone, or the vinylcaprolactam and the vinylpyrrolidone in the monomer mixture is at most 50 wt % based on the total weight of the monomer mixture.

4. Primer according to claim 1 , wherein the monomer mixture further comprises n-butyl acrylate.

5. Primer according to claim 1 , wherein a metal in the at least one metal compound is selected from the group consisting of titanium, aluminium, zirconium, zinc, and iron.

6. Primer according to claim 1 , wherein the concentration of the copolymer, based on the total weight of the primer, is from 1 wt % to 30 wt %.

7. Primer according to claim 1 , wherein the at least one chlorinated polyolefin has been modified with an α,β-unsaturated carboxylic acid, with an anhydride thereof, or with an acrylate.

8. Primer according to claim 1 , wherein the primer is free of block copolymers of the polystyrene/polydiene or polystyrene/hydrogenated polydiene type.

9. Primer according to claim 1 , wherein the primer further comprises at least one organofunctional silane of Formula (I)
(R 1 O—) x Si(R 2 ) y (R 3 ) z    Formula (I)

in which:
x=1, 2 or 3;
when x=1, R 1 is a C 1 -C 4 alkyl radical, a C 2 -C 6 alkoxyalkyl radical, or an acyl radical;
when x=2 or 3, R 1 are each independently a C 1 -C 4 alkyl radical, a C 2 -C 6 alkoxyalkyl radical, or an acyl radical;
y=0 or 1;
when y=1, R 2 is an aminoalkyl radical, a vinyl group, a methacryloyloxyalkyl radical, an isocyanatoalkyl radical, an O-methylcarbamatoalkyl radical, a glycidoxyalkyl radical, or a phenyl radical;
z=4−x−y; and
when z=2 or 3, R 3 are each independently a C 1 -C 18 alkyl radical.

10. Primer according to claim 1 , wherein the primer further comprises one or more epoxy resins.

11. Primer according to claim 1 , wherein the primer further comprises one or more styrene-acrylate resins.

12. Primer according to claim 1 , wherein the primer further comprises acetylacetone.

13. Primer according to claim 1 , wherein the primer further comprises one or more fluorescent optical brighteners.

14. Method for producing an adhesion-promoting layer on a substrate, comprising:
applying the primer of claim 1 , in dispersion in one or more dispersants or in solution in one or more solvents, to a substrate; and
removing the one or more dispersants or the one or more solvents.

15. Primer according to claim 1 , wherein the monomer mixture is free of acrylic acid.

Assignees

• Tesa Se

Inventors

• Dietze Sebastian
• Ellringmann Kai
• Kupsky Marco
• Nguyen Duc Hung
• Schümann Uwe

Classifications

• C09J2427/008

  in the pretreated surface to be joined · CPC title

• B05D3/0254

  After-treatment · CPC title

• C09J2433/003

  in the primer coating · CPC title

• C09J2425/00

  Presence of styrenic polymer · CPC title

• C09J2455/008

  in the pretreated surface to be joined · CPC title