| 摘要 |
The present invention relates to blend compositions comprising; (A) of from about 1 to about 99 weight percent based on the combined weights of Components A, B and C of at least one substantially random interpolymer; and wherein said interpolymer; (1) contains of from about 0.5 to about 65 mole percent of polymer units derived from; (a) at least one vinylidene aromatic monomer, or (b) at least one hindered aliphatic vinylidene monomer, or (c) a combination of at least one vinylidene aromatic monomer and at least one hindered aliphatic vinylidene monomer; (2) contains of from about 35 to about 99.5 mole percent of polymer units derived from at least one aliphatic alpha -olefin having from 2 to 20 carbon atoms; (3) has a molecular weight (Mn) greater than about 1,000; (4) has a melt index (I2) of from about 0.01 to about 1,000; (5) has a molecular weight distribution (Mw/Mn) of from about 1.5 to about 20; and (B) of from about 99 to about 1 weight percent based on the combined weights of Components A, B, and C of one or more vinyl halide homopolymer(s) or copolymer(s); and (C) of from about 0 to about 70 weight percent based on the combined weights of Components A, B, and C of one or more plasticizers. The novel blend compositions, provide materials with improved processing/property attributes over the unmodified polymers comprising the blends. The blend compositions can exhibit a unique balance of properties including enhanced modulus and barrier properties, improved tensile strength, radio frequency (rf) sealability, solvent bondability, thermal stability and heat resistance depending upon the selection of the individual blend components and their composition ratios. Additionally, the location and the breadth of the glass transition can be controlled by varying the blend composition and plasticizer level. Surprisingly blends including a plasticizer show a single phase material from glass transition temperature data analysis.
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