14-01-2021 дата публикации
Номер: US20210009869A1
Принадлежит:
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. 1. 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; andwherein the contact adhesive passes a blocking test of 84% relative humidity, 72° F. with 1 kg weight for at least 500 hours.2. The contact adhesive of claim 1 , wherein the metallocene-catalyzed olefin block copolymer which is an ethylene-octene block copolymer.3. The contact adhesive of claim 1 , wherein the polyethylene wax and/or Fischer-Tropsch wax have a hardness value of less than or equal to about 3 dmm at 25° C. claim 1 , measured in accordance with ASTM D1321.4. The contact adhesive of claim 1 , further comprising an additive selected from the group consisting of antioxidant claim 1 , brighteners claim 1 , fillers claim 1 , adhesion promoters claim 1 , pigments and mixtures thereof.5. An article comprising the contact adhesive of and a substrate selected from the group consisting of paperboard claim 1 , corrugated board claim 1 , Kraft paper claim 1 , paper claim 1 , plastic film claim 1 , foil claim 1 , glass claim 1 , and mixtures thereof.6. The article of claim 5 , which is a label claim 5 , package claim 5 , envelope claim 5 , carton claim 5 , case claim 5 , box claim 5 , label claim 5 , bag claim 5 , multilayer film claim 5 , foil bag claim ...
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