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Blends based on vinyl aromatic polymers with enhanced mechanical characteristics
| Details |
Inventors: Fasulo, Gian C.; Ghidoni, Dario; Callaioli, Andrea; Matarrese, Savino;
Assignee: Montedipe S.r.l. (IT)
Primary Examiner: Marquis; Melvyn I.
Assistant Examiner: Aylward; D.
Attorney, Agent or Firm: Morgan & Finnegan
This invention relates to blends based on vinyl aromatic polymers endowed with high mechanical characteristics, even after successive processings at temperatures equal to or greater than 200.degree. C., comprising: a vinyl aromatic polymer containing from 0.5 to 5% by weight of a vinyl aromatic monomer-conjugated diene linear block polymer and from 5 to 15% by weight of a diene rubber; a polyolefine; and a vinyl aromatic monomer-conjugated diene linear block polymer, having a diene content between 20 and 80% by weight; the sum of the three components being equal to 100%. |
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DETAILED DESCRIPTION We claim: 1.
A blend based on vinyl aromatic polymers endowed with high mechanical properties even after successive processings at temperatures equal to or higher than 200.
degree.
C.
, comprising: from about 10 to 90% by weight of a vinyl aromatic polymer (A) formed by the polymerization of a vinyl aromatic monomer in the presence of both a linear block polymer and a diene rubber, wherein the vinyl aromatic polymer (A) contains from 0.
5 to 5% by weight of a vinyl aromatic monomer-conjugated diene linear block polymer and from 5 to 15% of a diene rubber; from about 5 to 50% by weight of a polyolefin (B); and, from about 5 to 40% by weight of a vinyl aromatic monomer-conjugated diene linear block polymer (C) having a diene amount between 20 and 80% by weight, wherein the sum of the above three components is equal to 100.
2.
The blend based on vinyl aromatic polymers according to claim 1, comprising: from 60 to 80% by weight of the vinyl aromatic polymer (A); from 10 to 30% by weight of a polyolefin (B); and from 5 to 20% by weight of a vinyl aromatic monomer-conjugated diene linear block polymer (C); the sum of the above three components being equal to 100.
3.
The blend based on vinyl aromatic polymers according to claim 1, wherein the amount of the diene rubber in the vinyl aromatic polymer (A) is between 7 and 12% by weight.
4.
The blend based on vinyl aromatic polymers according to claim 1, wherein the amount of the vinyl-aromatic monomer-conjugated diene linear block polymer, in the vinyl aromatic polymer (A), is between 2 and 5% by weight.
5.
The blend based on aromatic vinyl polymers according to claim 1, wherein the vinyl aromatic monomer-conjugated diene linear block polymer contains from 20 to 75% by weight of recurring units of a vinyl aromatic monomer and, correspondingly, from 80 to 25% by weight of recurring units of a conjugated diene.
6.
The blend based on vinyl aromatic polymers according to claim 1, wherein the linear block copolymer is constituted by pure polymeric blocks of vinyl aromatic monomer and conjugated diene monomer
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