Patent ID: 11898023
Assignee: DOW GLOBAL TECHNOLOGIES LLC
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  H  Y | IPC C  H

Claim 0:
1. A polyolefin photovoltaic (PV) backsheet comprising:
an optional seal layer (A);
an optional tie layer (B); and
a layer (C) composed of a first polypropylene and a second polypropylene different than the first polypropylene, the first polypropylene and the second polypropylene each having a melting point greater than 125° C.;
the layer (C) stabilized with
(A) from 0.5 wt % to 3.0 wt % of at least one hindered amine comprising a radical selected from the group consisting of a 2,2,6,6-tetraalkylpiperidine having a triazine moiety, a 2,2,6,6-tetraakylpiperazinone radical having a triazine moiety, and combinations thereof,
(B) from 3,000 ppm to 6,000 ppm of a thioester,
(C) from 7,500 ppm to 15,000 ppm of at least one hindered hydroxybenzoate that is 3 5-di-tert-butyl-4-hydroxybenzoic acid, hexadecyl ester, and
(D) from 100 ppm to 4,000 ppm of an ortho hydroxyl triazine compound, wherein weight percent of (A), (B), (C), and (D) is based on total weight of the layer (C); and
the layer (C) is void of flame retardant agents and has a flame spread index less than 100 as measured in accordance with ASTM E162-02a.