US 11,732,085 B2
Epoxy composition
Bharati Balijepalli, Midland, MI (US); David H. Bank, Midland, MI (US); and Michael A. Lowe, Midland, MI (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/428,493
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Jan. 29, 2020, PCT No. PCT/US2020/015528
§ 371(c)(1), (2) Date Aug. 4, 2021,
PCT Pub. No. WO2020/167467, PCT Pub. Date Aug. 20, 2020.
Claims priority of provisional application 62/806,307, filed on Feb. 15, 2019.
Prior Publication US 2022/0017685 A1, Jan. 20, 2022
Int. Cl. C08J 5/24 (2006.01); C08G 59/38 (2006.01); C08G 59/40 (2006.01); C08G 59/68 (2006.01); B32B 27/38 (2006.01); C08L 63/00 (2006.01); C08L 63/02 (2006.01); C08L 63/04 (2006.01); C08G 59/26 (2006.01); C08G 59/44 (2006.01); C08K 5/103 (2006.01); C08K 5/5377 (2006.01); C09K 21/12 (2006.01)
CPC C08G 59/26 (2013.01) [C08G 59/44 (2013.01); C08G 59/686 (2013.01); C08J 5/243 (2021.05); C08K 5/103 (2013.01); C08K 5/5377 (2013.01); C09K 21/12 (2013.01); C08J 2363/00 (2013.01); C08K 2201/005 (2013.01); C08K 2201/014 (2013.01)] 11 Claims
 
1. A curable flame retardant epoxy resin composition comprising:
(a) a combination of epoxy resins comprising at least one diglycidyl ether of a bisphenol, at least one epoxy novolac resin, and at least one oxazolidone-containing epoxy resin;
(b) at least one non-halogenated, phosphorus-containing flame retardant agent having an average particle size of less than 5 microns for providing a fiber reinforced epoxy resin composite that retains its mechanical properties while the fiber reinforced epoxy resin composite exhibits a flame retardancy of at least a UL 94 V-1 rating;
(c) at least one mold release agent;
(d) at least one micronized latent curing agent having a particle size distribution in which 98% of the particles have a maximum particle diameter that is less than 10 μm and where at least 35% of particles have a particle diameter that is less than 2 μm; and
(e) at least one catalyst;
wherein the at least one non-halogenated, phosphorus-containing flame retardant (b) is present in an amount of from 10 wt % to 20 wt %, based on the total weight of the composition.