	US 11,866,622 B2
	Flame retardant pressure-sensitive adhesive, flame retardant pressure-sensitive adhesive sheet and method for preparing same
Qing Wu, Shanghai (CN); and Fan Gao, Shanghai (CN)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/250,158
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Jun. 10, 2019, PCT No. PCT/IB2019/054823 § 371(c)(1), (2) Date Dec. 7, 2020, PCT Pub. No. WO2019/239291, PCT Pub. Date Dec. 19, 2019.
Claims priority of application No. 201810599246.3 (CN), filed on Jun. 11, 2018.
Prior Publication US 2021/0253909 A1, Aug. 19, 2021
Int. Cl. C09J 7/25 (2018.01); C09J 7/38 (2018.01); C09J 133/02 (2006.01); C09J 133/06 (2006.01); C09J 133/08 (2006.01); C09J 133/10 (2006.01); C08K 5/51 (2006.01); C08K 5/5399 (2006.01); C09J 4/06 (2006.01); C08K 5/523 (2006.01)

CPC C09J 7/25 (2018.01) [C08K 5/51 (2013.01); C09J 4/06 (2013.01); C09J 7/385 (2018.01); C09J 133/02 (2013.01); C09J 133/068 (2013.01); C09J 133/08 (2013.01); C09J 133/10 (2013.01); C08K 5/523 (2013.01); C08K 5/5399 (2013.01); C09J 2301/122 (2020.08); C09J 2301/302 (2020.08); C09J 2433/00 (2013.01); C09J 2479/086 (2013.01)]

12 Claims

1. A flame-retardant pressure-sensitive adhesive, comprising reaction products of the following reaction compositions:

1) 35-99 wt. % of a (meth)acrylate copolymer containing a functional reactive functional group, based a total weight of the reaction compositions as 100 wt. %; the functional reactive functional group comprising one or a plurality of the following groups: carboxyl group, hydroxyl group, and epoxy group; the (meth)acrylate copolymer containing the functional reactive functional group being formed by free radical polymerization of one or a plurality of monomers comprising the following:

a1) 86-99 wt. % of a (meth)alkyl acrylate, based on a total weight of the employed monomers as 100 wt. %, and

a2) 1-14 wt. % of a monomer containing a functional reactive functional group, based on the total weight of the employed monomers as 100 wt. %;

2) 1-65 wt. % of a reactive organophosphorus flame retardant capable of reacting with the functional reactive functional group, based on a total weight of the pressure-sensitive adhesive as 100 wt. %; the molecular weight of the reactive organophosphorus flame retardant being 800-2400; and the reactive organophosphorus flame retardant being formed by reaction of reaction components comprising the following substances:

b1) a compound or oligomer containing n epoxy groups, wherein an epoxy equivalent weight of the compound or oligomer is E, and n>=2, and

b2) 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, the relationship between the weight contents of b1 and b2 being as follows: b2=(216*b1)/(nE(n−1)).