Adhesive compositions and use thereof

Patent metadata

Field	Value
Publication number	US-10619078-B2
Application number	US-201715631145-A
Country	US
Kind code	B2
Filing date	Jun 23, 2017
Priority date	Nov 19, 2010
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

The invention provides adhesives comprising at least one polymer component which contains at least 65 weight percent propylene, at least one nucleator and at least one functionalized wax. The inventive adhesives have increased heat resistance and decreased set-time, making them particularly well suited for assembly and packaging applications.

First claim

We claim:

1. A process for forming an adhesive comprising:
(a) thermomechanically degrading ethylene-propylene rubber and/or ethylene-propylene diene rubber, in an extruder under heat and shear stress in the presence of at least one radical donor;
(b) heating the thermomechanical degraded elastomeric rubber with a semi-crystalline propylene polymer to form a polymer component; wherein the polymer component which contains, in polymerized form, at least 65 wt % of propylene, based on the total weight of the polymer component, to a molten state;
(c) adding at least one nucleator and at least one functionalized wax, which is polypropylene (co)polymer grafted with a maleic anhydride, into the molten polymer component, wherein the weight ratio of the nucleator to the functionalized wax ranges from about 1:500 to about 50:1; and
(d) cooling the mixture.

2. The process of claim 1 wherein the polymer component comprises a copolymer of propylene and at least one comonomer, wherein the comonomer is selected from ethylene and/or C 4-20 alpha-olefins.

3. The process of claim 1 wherein the nucleator is a sorbitol, a sorbitol derivative, a multiple amides component, or a multiple amides component derivative.

4. The process of claim 1 further comprising adding a tackifier, an oil, a non-functionalized wax, a plasticizer, and/or a stabilizer to form a homogeneous mixture after step (c) and before step (d).

Assignees

• Henkel Ag & Co Kgaa
• Henkel IP & Holding GmbH

Inventors

• Ellis Richard
• Paul Charles W
• Kasper Dirk
• Padurschel Petra
• Eodice Andrea

Classifications

• C09J7/243

  Ethylene or propylene polymers · CPC title

• Y10T428/1303

  Paper containing [e.g., paperboard, cardboard, fiberboard, etc.] · CPC title

• C09J7/35

  Heat-activated · CPC title

• C09J2423/10

  Presence of homo or copolymers of propene · CPC title

• C08L2023/42

  Depolymerisation, vis-breaking or degradation · CPC title