US 11,655,400 B2
Hot melt adhesive for polyolefin films
Bernhard Herlfterkamp, Bottrop (DE); Eckhard Puerkner, Duesseldorf (DE); Andy Swain, Chesham (GB); Wolfgang Klingberg, Korschenbroich (DE); Marcel Huebenthal, Haan (DE); Mario Eckers, Wegberg (DE); Stefan Strenger, Essen (DE); Julia Thomas, Wokingham (GB); Oliver Klewe, Langenfeld (DE); Kevin Mills, High Wycombe (GB); Alexander Caspers, Moenchengladbach (DE); Michael Schroettle, Neuss (DE); and George Easdown, Church Crookham (GB)
Assigned to HENKEL AG & CO., KGaA, Duesseldorf (DE)
Filed by HENKEL AG & CO. KGAA, Duesseldorf (DE)
Filed on Apr. 21, 2017, as Appl. No. 15/493,758.
Application 15/493,758 is a continuation of application No. PCT/EP2015/074452, filed on Oct. 22, 2015.
Claims priority of application No. 10 2014 221 553.6 (DE), filed on Oct. 23, 2014.
Prior Publication US 2017/0226388 A1, Aug. 10, 2017
Int. Cl. C09J 123/02 (2006.01); C09J 5/00 (2006.01); B32B 1/02 (2006.01); B32B 7/12 (2006.01); B65D 65/42 (2006.01); B32B 27/32 (2006.01); B32B 37/12 (2006.01); B32B 5/02 (2006.01); B32B 5/26 (2006.01); B65D 85/00 (2006.01); B32B 27/08 (2006.01); C08L 23/02 (2006.01); C08L 23/20 (2006.01); C09J 7/21 (2018.01); C09J 7/24 (2018.01); C09J 7/35 (2018.01)
CPC C09J 123/02 (2013.01) [B32B 1/02 (2013.01); B32B 5/022 (2013.01); B32B 5/024 (2013.01); B32B 5/26 (2013.01); B32B 7/12 (2013.01); B32B 27/08 (2013.01); B32B 27/32 (2013.01); B32B 37/1207 (2013.01); B65D 65/42 (2013.01); B65D 85/70 (2013.01); C08L 23/02 (2013.01); C08L 23/20 (2013.01); C09J 5/00 (2013.01); C09J 7/21 (2018.01); C09J 7/243 (2018.01); C09J 7/35 (2018.01); B32B 2037/1215 (2013.01); B32B 2255/10 (2013.01); B32B 2255/26 (2013.01); B32B 2323/04 (2013.01); B32B 2323/10 (2013.01); B32B 2439/46 (2013.01); C08L 2205/025 (2013.01); C09J 2423/00 (2013.01); C09J 2423/046 (2013.01); C09J 2423/106 (2013.01)] 4 Claims
 
1. A hot-melt adhesive consisting of:
a) 25 to 95 wt % of a mixture of atactic polyolefin-based polymers of
a1) 20 to 80 wt %, based on the mixture of polyolefin-based polymer, of a first atactic poly-α-olefin, which is an (i) ethylene/α-olefin with propene, 1-butene, 1-hexene, or 1-octene comonomer; or (ii) propylene/α-olefin with ethylene, 1-butene, 1-hexene, or 1-octene comonomer; having a molecular weight Mn of <10,000 g/mol and a first glass transition temperature, and
a2) 20 to 80 wt %, based on the mixture of polyolefin-based polymer, of a second atactic poly-α-olefin, which is an (i) ethylene/α-olefin with propene, 1-butene, 1-hexene, or 1-octene comonomer; or (ii) propylene/α-olefin with ethylene, 1-butene, 1-hexene, or 1-octene comonomer; having a molecular weight Mn of >10,000 g/mol and a second glass transition temperature;
b) 1 to 75 wt % of at least one tackifying resin;
c) 0 to 15 wt % of at least one poly(iso)butylene having a molecular weight Mw of less than 5,000 g/mol and free of naphthenic oils; and
d) 0 to 30 wt % of at least one additive and/or adjuvant selected from stabilizers, adhesion promoters, fillers or pigments, waxes, or combinations thereof
wherein the hot-melt adhesive has a viscosity range of 5,000 to 11,300 mPas, measured at 160° C. with a Brookfield CAP, spindle 27 and
wherein the hot-melt adhesive has a softening point of 70-87.9° C. as measured in accordance with ASTM E 28.