	US 12,187,929 B2
	Film-initiated cure of structural adhesive film
Shantanu R. Ranade, Woodbury, MN (US); Alexander J. Kugel, Woodbury, MN (US); Kai U. Claussen, Munich (DE); Rachna Khurana, Inver Grove Heights, MN (US); Dean M. Moren, North St. Paul, MN (US); William H. Sikorski, Jr., Birchwood Village, MN (US); and Erik M. Townsend, South St. Paul, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 15/733,471
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Feb. 8, 2019, PCT No. PCT/US2019/017182 § 371(c)(1), (2) Date Aug. 4, 2020, PCT Pub. No. WO2019/157262, PCT Pub. Date Aug. 15, 2019.
Claims priority of provisional application 62/743,917, filed on Oct. 10, 2018.
Claims priority of provisional application 62/628,702, filed on Feb. 9, 2018.
Prior Publication US 2021/0102095 A1, Apr. 8, 2021
Int. Cl. C09J 7/38 (2018.01); C09J 5/04 (2006.01); C09J 7/10 (2018.01); C09J 11/04 (2006.01)

CPC C09J 7/385 (2018.01) [C09J 5/04 (2013.01); C09J 7/10 (2018.01); C09J 11/04 (2013.01); C09J 2301/208 (2020.08); C09J 2301/302 (2020.08); C09J 2433/00 (2013.01)]

20 Claims

1. An adhesive system comprising:

I) a tape comprising a support layer with two first curable adhesive films borne on or directly bound to opposite faces of the support layer, each first curable adhesive film independently comprising a blend of:

a) a first film-forming polymer or oligomer;

b) a first species comprising first unsaturated free-radically polymerizable groups, which may be a) or a species other than a);

c) a first transition metal cation; and

d) a reducing agent which is not a), b), or c);

wherein neither of the first curable adhesive films comprises an oxidizing agent which is not a), b), c), or d); and

II) a second curable adhesive film comprising a blend of:

e) a second film-forming polymer or oligomer;

f) a second species comprising second unsaturated free-radically polymerizable groups, which may be e) or may be a species other than e); and

g) an oxidizing agent which is not e) or f).