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US 2021/0009869 A1Published application
Contact adhesives and uses thereof
AssigneeHenkel IP & Holding GmbH
InventorChuiwah Alice CHEUNG
Life of this patent
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Abstract
The present invention provides pre-applied contact adhesives that maintains strong cohesiveness over extended time and varied temperature conditions, while balancing low adhesiveness to other substrates. The pre-applied adhesives are applied onto paperboard, corrugated board, Kraft paper, paper, plastic film, glass, and are suitable as label, package, envelope, carton, case, box, label, bag, multilayer film, foil bag, bottle or band.
Claims17
A contact adhesive comprising:
- (a) a metallocene-catalyzed olefin block copolymer;
- (b) a mixture of polyethylene wax and Fischer-Tropsch wax, having a penetration hardness value of less than about 5 dmm at 25° C., measured in accordance with ASTM D3954;
- (c) a plasticizer;
- and
- (d) a tackifier;
- wherein the contact adhesive is essentially free from polypropylene based polymer and/or wax;
- and
- wherein the contact adhesive passes a blocking test of 84% relative humidity, 72° F. with 1 kg weight for at least 500 hours.
5 more elements
An article comprising:
- (a) a first substrate;
- (b) a second substrate;
- and
- (c) a pre-applied contact adhesive comprising (1) a metallocene-catalyzed olefin block copolymer (2) a mixture of polyethylene wax and Fischer-Tropsch wax, having a penetration hardness value of less than about 5 dmm at 25° C., measured in accordance with ASTM D3954;
- (3) a plasticizer;
- and (4) a tackifier;
- wherein the contact adhesive passes a blocking test of 84% relative humidity, 72° F. with 1 kg weight for at least 500 hours.
4 more elements
Dependencies are inferred from the claim text.