Method for producing a self-adhesive

Patent metadata

Field	Value
Publication number	US-10457791-B2
Application number	US-201715497601-A
Country	US
Kind code	B2
Filing date	Apr 26, 2017
Priority date	Apr 1, 2009
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A method for producing a foamed thermally crosslinked mass system, wherein the mass system is foamed at a first temperature in a first step, and crosslinker substances are added to the mass system in a subsequent step at a second temperature lower than the first temperature, wherein the crosslinker substances are crosslinker substances for thermal crosslinking of the mass system.

First claim

The invention claimed is:

1. A method for producing a self-adhesive, comprising:
foaming a mass system comprising unexpanded microballoons at a first temperature, thereby forming a foamed mass system;
mixing crosslinker substances into the foamed mass system at a second temperature, which is lower than the first temperature, thereby forming a blended mass system; and
shaping the blended mass system to form a layer, thereby forming a self-adhesive,

wherein the crosslinker substances are crosslinker substances for thermal crosslinking of the foamed mass system.

2. The method of claim 1 , wherein the first temperature is equal to or above an expansion temperature of the unexpanded microballoons and the second temperature is below the expansion temperature.

3. The method of claim 1 , wherein:
in a first mixing assembly expandable microballoons and optionally further additives are introduced into a first mass system, thereby forming a second mass system;
the second mass system is heated under superatmospheric pressure to a temperature which at least corresponds to, and is optionally higher than, an expansion temperature of the expandable microballoons under atmospheric pressure;
the expandable microballoons are expanded on emergence from the first mixing assembly, thereby forming a third mass system;
the third mass system is introduced into a second mixing assembly, whereby the third mass system is at a temperature below the expansion temperature of the unexpanded microballoons;
the crosslinker substances are added to the second mixing assembly, thereby forming a fourth mass system; and
the fourth mass system is shaped.

4. The method of claim 1 , wherein:
in a first mixing assembly expandable microballoons and optionally further additives are introduced into a first mass system, thereby forming a second mass system;
the first mixing assembly comprises a first mixing zone and a second mixing zone;
the second mass system is heated under superatmospheric pressure in the first mixing zone to a temperature which is equal to or higher than an expansion temperature of the expandable microballoons under atmospheric pressure, thereby forming a third mass system;
the third mass system is transferred from the first mixing zone into the second mixing zone;
the third mass system in the second mixing zone is at a temperature below the expansion temperature of the expandable microballoons;
the crosslinker substances are added during transfer of the third mass system to the second mixing zone and/or after transfer of the third mass system to the second mixing zone, thereby forming a fourth mass system; and
the fourth mass system is shaped.

5. The method of claim 1 , wherein the self-adhesive is applied to a web-form carrier or a release material.

6. The method of claim 1 , wherein thermal crosslinking takes place after shaping.

7. The method of claim 1 , wherein the foamed mass system is in a noncrosslinked state.

8. A self-adhesive produced by the method of claim 1 .

9. A self-adhesive for a single or double-sided self-adhesive tape comprising the self-adhesive of claim 8 .

Assignees

• Tesa Se

Inventors

• Czerwonatis Franziska
• Schönbom Stephan
• Burmeister Axel
• Lass Volker

Classifications

• C09J7/38

  Pressure-sensitive adhesives [PSA] · CPC title

• C09J7/10

  without carriers · CPC title

• B29K2105/0076

  Microcapsules · CPC title

• B29C44/569

  Shaping and joining components with different densities or hardness · CPC title

• C08J2333/08

  Homopolymers or copolymers of acrylic acid esters · CPC title