FLAME-RETARDENT COMPOSITION AND MOLDED ARTICLE MADE THEREFROM
A flame-retardant composition including polypropylene, anhydride modified polyethylene and inorganic filler and a rigid molded article prepared with the flame-retardant composition. Also disclosed a method of molding a rigid article from the flame-retardant composition.
1 . A composition of matter comprising:
a polypropylene polymer;
an anhydride modified polyethylene polymer; and
inorganic filler.
2 . The composition of matter of claim 1 , wherein said polypropylene polymer comprises an impact polypropylene polymer.
3 . The composition of matter of claim 1 , wherein said inorganic filler comprises a metal hydroxide filler.
4 . The composition of matter of claim 3 , wherein said metal hydroxide filler comprises magnesium hydroxide filler.
5 . The composition of matter of claim 1 , wherein said polypropylene polymer is present in an amount of about 40 weight percent to about 60 weight percent based on the total weight of the composition of matter.
6 . The composition of matter of claim 1 , wherein said anhydride modified polyethylene polymer is present in an amount of about 1 weight percent to about 10 weight percent based on the total weight of the composition of matter.
7 . The composition of matter of claim 1 , wherein said inorganic filler is present in an amount of about 40 weight percent to about 70 weight percent based on the total weight of the composition of matter.
8 . The composition of matter of claim 1 , wherein said composition of matter further comprises a styrene—butadiene block copolymer.
9 . The composition of matter of claim 8 , wherein said styrene—butadiene block copolymer is present in an amount of greater than 0 weight percent to about 5 weight percent based on the total weight of the composition of matter.
10 . The composition of matter of claim 1 , wherein the composition of matter does not contain any halogens.
11 . The composition of matter of claim 1 , wherein the composition of matter does not contain any thermoplastic elastomer.
12 . The composition of matter of claim 1 , wherein the composition of matter exhibits a Shore A hardness in the range of 60 to 65.
13 . The composition of matter of claim 1 , wherein the composition of matter exhibits a flexural modulus less than 2000 MPa.
14 . The composition of matter of claim 1 , wherein the composition of matter exhibits a tensile strength in the range of 15 MPa to 25 MPa.
15 . The composition of matter of claim 1 , wherein the composition of matter exhibits an Izod impact resistance in the range of 140 J/m to 160 J/m.
16 . A molded article of manufacture comprising the composition of matter of claim 1 .
17 . A method for preparing a molded article comprising:
preparing the composition of matter of claim 1 ; and
molding said article from said composition.
18 . The method of claim 17 , wherein said molding comprises injection molding.