CPC B29C 70/20 (2013.01) [B29C 70/443 (2013.01); C08K 5/005 (2013.01); C08K 5/105 (2013.01); C08K 5/34924 (2013.01); C08K 5/38 (2013.01); C08K 5/527 (2013.01); C08K 7/14 (2013.01); C08L 23/12 (2013.01); C08L 23/14 (2013.01); B29K 2023/12 (2013.01); B29K 2023/14 (2013.01); B29K 2309/08 (2013.01)] | 24 Claims |
1. A fiber-reinforced polymer composition comprising:
a polymer matrix that contains a propylene polymer, wherein the polymer matrix constitutes from about 20 wt. % to about 90 wt. % of the composition;
a plurality of long reinforcing fibers that are distributed within the polymer matrix, wherein the fibers constitute from about 10 wt. % to 50 wt. % of the composition; and
a stabilizer system consisting of a sterically hindered phenol antioxidant, phosphite antioxidant, thioester antioxidant, and optionally a UV stabilizer, wherein the weight ratio of the thioester antioxidant to the phosphite antioxidant is from about 1:1 to about 5:1 and the weight ratio of the phosphite antioxidant to the sterically hindered phenol antioxidant is from about 1.5:1 to about 5:1,
wherein the polymer composition exhibits a tensile strength from 140.6 MPa to about 300 MPa as determined according to ISO Test No. 527-1:2012 at 23° C., wherein the phosphite antioxidant is an aryl diphosphite having the following general structure (IX):
wherein,
R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 are independently selected from hydrogen, C1 to C10 alkyl, and C3 to C30 branched alkyl.
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