US 12,012,542 B2
Flame retardant rotomolded polyolefin
John A. Sigler, Plainsboro, NJ (US); Thomas F. Thompson, Colonia, NJ (US); and Stephen Mark Andrews, Richmond, VA (US)
Assigned to BASF SE, Ludwigshafen (DE)
Appl. No. 16/967,612
Filed by BASF SE, Ludwigshafen (DE)
PCT Filed Feb. 20, 2019, PCT No. PCT/US2019/018711
§ 371(c)(1), (2) Date Aug. 5, 2020,
PCT Pub. No. WO2019/168718, PCT Pub. Date Sep. 6, 2019.
Claims priority of provisional application 62/635,764, filed on Feb. 27, 2018.
Prior Publication US 2021/0087471 A1, Mar. 25, 2021
Int. Cl. C09K 21/12 (2006.01); B29C 41/04 (2006.01); B29K 23/00 (2006.01); B29K 105/00 (2006.01); C08K 5/3435 (2006.01); C08K 5/3492 (2006.01); C08K 5/5357 (2006.01)
CPC C09K 21/12 (2013.01) [C08K 5/3435 (2013.01); C08K 5/34924 (2013.01); C08K 5/34926 (2013.01); C08K 5/5357 (2013.01); B29C 41/042 (2013.01); B29K 2023/0633 (2013.01); B29K 2105/0026 (2013.01); C08K 2201/005 (2013.01); C08K 2201/014 (2013.01)] 13 Claims
 
1. A flame-retardant plastic article comprising a polyolefin substrate and additives incorporated in the polyolefin substrate, the polyolefin substrate comprising a low density polyethylene, the additives comprising:
i) a phosphonate ester;
ii) an N-alkoxy hindered amine;
iii) melamine cyanurate; and
iv) a base stabilization combination comprising pentaerythritol tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butylphenyl) phosphite and N,N-di(C16-C18alkyl)hydroxylamine,
wherein the plastic article contains a hollow portion therein, and
wherein the article has an average wall thickness of from about 1.50 mm to about 6.00 mm.