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Stengthened high impact styrene polymers showing improved physical-mechanical properties
| Details |
Inventors: Cigna, Giuseppe; Fasulo, Gian C.; Biglione, Gianfranco; Borghi, Italo;
Assignee: Montedipe S.p.A. (Milan, IT)
Primary Examiner: Seccuro; Carman J.
Assistant Examiner:
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher
Strengthened high impact resistant styrene polymers having improved physical-mechanical properties, particularly a high resilience at room temperature and at lower temperatures, and break elongation, containing as a dispersed phase an olefinic rubber, preferably an ethylene-propylene or an ethylene-propylene-diene rubber and a polyolefin. The amount of the polyolefin may be up to 15% by weight. |
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DETAILED DESCRIPTION What is claimed is: 1.
A strengthened high impact styrene polymer blend having improved physical-mechanical features, and in particular high impact strength at room temperature and at lower temperatures and high break elongation, which polymer blend comprises a styrene polymer containing dispersed therein an olefine rubber in an amount of at least 5% by weight with respect to the styrene polymer, and a strengthening component consisting of a polyolefin in an amount ranging between 15 and 0.
01% by weight with respect to the polymer blend.
2.
A strengthened high impact styrene polymer blend according to claim 1.
3.
A strengthened high impact styrene polymer blend according to claim 1 or 2, wherein the size of the dispersed particles ranges between 0.
02 and 5 micrometers.
4.
A strengthened high impact styrene polymer blend according to claim 1 or 2, wherein the polyolefin is selected from the class consisting of polyethylene, polypropylene, an ethylene-propylene copolymer containing from 75 to 98% by weight of ethylene and correspondingly from 25 to 2% by weight of propylene, and a polyolefine wax.
5.
A strengthenbed high impact styrene polymer blend according to claim 4, wherein the polyolefin is polyethylene having a density ranging between 0.
90 and 0.
97 g/cm.
sup.
3 and selected from the class consisting of low density polyethylene, linear low density polyethylene, and high density polyethylene.
6.
A strengthened high impact styrene polymer blend according to claim 1, wherein the olefine rubber is selected from the class consisting of ethylene-polylene and ethylene-propylene-diene copolymers and mixtures thereof.
7.
A strengthened high impact styrene polymer blend according to claim 2, wherein the ratio by weight: polyolefin/polyolefin+olefinic rubber is not over 0.
5.
8.
A strengthened high impact styrene polymer blend according to claim 1, wherein the ratio R.
sub.
2 =polyolefin+olefinic rubber/olefinic rubber+polyolefin+SAN, is not over 0.
5.
9.
A strengthened high impact styrene polymer blend according to claim 8, wherein the ratio R
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