US 11,708,515 B2
Adhesive dual-component composition based on polyurethane
Francis Pardal, Compiègne (FR); Guillaume Michaud, Compiègne (FR); Aurélien Wiegand, Choisy au Bac (FR); and David Penet, Ribecourt (FR)
Assigned to BOSTIK SA, Colombes (FR)
Appl. No. 16/315,668
Filed by BOSTIK SA, Colombes (FR)
PCT Filed Jul. 7, 2017, PCT No. PCT/FR2017/051862
§ 371(c)(1), (2) Date Jan. 7, 2019,
PCT Pub. No. WO2018/011491, PCT Pub. Date Jan. 18, 2018.
Claims priority of application No. 16 56654 (FR), filed on Jul. 12, 2016.
Prior Publication US 2019/0300766 A1, Oct. 3, 2019
Int. Cl. C09J 175/08 (2006.01); B32B 7/12 (2006.01); B32B 37/12 (2006.01); C08G 18/40 (2006.01); C08G 18/42 (2006.01); C08G 18/48 (2006.01); C08G 18/76 (2006.01); C08G 18/79 (2006.01); C09J 5/00 (2006.01); C09J 175/06 (2006.01); C08G 18/32 (2006.01); C08G 18/28 (2006.01); C09J 175/04 (2006.01)
CPC C09J 175/08 (2013.01) [B32B 7/12 (2013.01); B32B 37/12 (2013.01); C08G 18/289 (2013.01); C08G 18/3206 (2013.01); C08G 18/4018 (2013.01); C08G 18/4202 (2013.01); C08G 18/4277 (2013.01); C08G 18/4288 (2013.01); C08G 18/4825 (2013.01); C08G 18/4829 (2013.01); C08G 18/7621 (2013.01); C08G 18/791 (2013.01); C09J 5/00 (2013.01); C09J 175/04 (2013.01); C09J 175/06 (2013.01); B32B 2553/00 (2013.01); C09J 2475/00 (2013.01)] 17 Claims
 
1. A two-component polyurethane-based adhesive composition comprising an —NCO component and an —OH component, wherein:
the —NCO component is a composition comprising:
A) at least one polyurethane prepolymer comprising at least two NCO end groups, said at least one polyurethane prepolymer obtained by a polyaddition reaction comprising reacting
at least one asymmetric diisocyanate monomer and
at least one diol, wherein the diol has a hydroxyl number (OHN) of 112 to 280 mg KOH/g, wherein the polyaddition reaction takes place in amounts of diisocyanate monomer(s) and of diol(s) resulting in an NCO/OH molar ratio, denoted r1, ranging from 1.5 to 2.2, and
B) at least one triisocyanate selected from the group consisting of isocyanurates, biurets, adducts of diisocyanates and of triols, and their mixtures; and
the —OH component is a composition comprising at least one polyol,
wherein for the two-component polyurethane-based adhesive composition, at least one of the at least one polyol of the —OH component or the at least one diol used for obtaining the —NCO component comprises a polyether polyol or a polyether diol, at least one of the at least one polyol of the —OH component or the at least one diol used for obtaining the —NCO component comprises a polyester polyol or a polyester diol, and
a ratio by weight of an amount of polyether polyol(s) to an amount of polyester polyol(s), denoted r4, ranges from 0.6 to 2.2, wherein for the determination of the ratio r4, an amount of a polyester diol is included in the amount of polyester polyol and an amount of a polyether diol is included in the amount of polyether polyol,
wherein the adhesive is constituted such that when it is used to form an adhesive layer bonding a thermoplastic film and a metal sheet, the level of cohesion of the adhesive layer is greater than or equal to 3 N/15 mm, wherein the level of cohesion is tested by the 180° peel test French standard NF T 54-122.