Foamable composition and article
AssigneeDow Global Technologies LLC
InventorYahong Zhang
Life of this patent
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Abstract
The present disclosure is directed to a foamable composition and a foam article formed from the foamable composition. In an embodiment, the foamable composition includes from 50 wt % to 65 wt % of a propylene impact copolymer, from 10 wt % to 18 wt % of an ethylene elastomer with a density from 0.860 g/cc to 0.89 g/cc and a melt index from 1 g/10 min to 50 g/10 min. from 10 wt % to 18 wt % of a propylene elastomer with a density from 0.860 g/cc to 0.890 g/cc and a melt flow rate from 1 g/10 min to 50 g/10 min, from 0 wt % to 15 wt % of a filler, and from 0.5 wt % to 5.0 wt % blowing agent. The foam article formed from the foamable composition has a density from 0.800 g/cc to 0.850 g/cc, and a notched Izod impact strength at 23° C. from greater than 11 KJ/m2 to 27 KJ/m2.
Claims5
A foam article consisting of:
- (A) from 55 wt % to 65 wt % of a propylene impact copolymer comprising
- (i) from 8 wt % to 11 wt % of an ethylene/propylene rubber phase,
- (ii) a density from 0.89 g/cc to 0.91 g/cc,
- (iii) a melt flow rate from 50 g/10 min to 70 g/10 min, and
- (iv) a Vicat softening point from 150° C. to 170° C.;
- (B) from 12 wt % to 18 wt % of an ethylene elastomer with
- (i) a density from 0.860 g/cc to 0.89 g/cc,
- (ii) a melt index from 4 g/10 min to 15 g/10 min,
- (iii) a melting point from 50° C. to 60° C.,
- (iv) a glass transition temperature from −60° C. to −50° C., and
- (v) a Vicat softening point from 30° C. to 40° C.;
- (C) from 12 wt % to 18 wt % of a propylene elastomer consisting of propylene and from 7 wt % to 13 wt % ethylene comonomer and having
- (i) a density from 0.860 g/cc to 0.890 g/cc,
- (ii) a melt flow rate from 15 g/10 min to 50 g/10 min, and
- (iii) a melting point from 60° C. to 90° C.;
- (D) from 8 wt % to 12 wt % of a filler selected from the group consisting of talc, calcium carbonate, mica, glass fibers, and combinations thereof;
- and
- (E) from 0.1 wt % to 0.5 wt % of an antioxidant;
- the foam article having
- (1) a density from 0.80 g/cc to 0.84 g/cc;
- (2) a notched Izod impact strength at 23° C. from greater than 11 KJ/m2 to 27 KJ/m2;
- (3) a notched Izod impact strength at −30° C. from 2.5 to 4.0 KJ/m2;
- and
- (4) a Young's modulus from greater than 600 MPa to less than 1100 MPa.
Dependencies are inferred from the claim text.