Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-03-05
2000-07-11
Wilson, Donald R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525216, 525232, 525241, 521139, C08L 2508, C08L 4700
Patent
active
060874473
DESCRIPTION:
BRIEF SUMMARY
The present invention pertains to blends of .alpha.-olefin/hindered vinylidene monomer interpolymers and vinyl aromatic polymers; foams therefrom and also foams from only .alpha.-olefin/hindered vinylidene monomer interpolymers. The blend components and their ratio were selected to provide superior performance and/or processability.
The generic class of materials covered by .alpha.-olefin/hindered vinylidene monomer substantially random interpolymers and including materials such as .alpha.-olefin/vinyl aromatic monomer interpolymers are known in the art and offer a range of material structures and properties which makes them useful for varied applications, such as compatibilizers for blends of polyethylene and polystyrene as described in U.S. Pat. No. 5,460,818.
One particular aspect described by D'Anniello et al. (Journal of Applied Polymer Science, Volume 58, pages 1701-1706 (1995)) is that such interpolymers can show good elastic properties and energy dissipation characteristics. In another aspect, selected interpolymers can find utility in adhesive systems, as illustrated in U.S. Pat. No. 5,244,996, issued to Mitsui Petrochemical Industries Ltd.
Although of utility in their own right, Industry is constantly seeking to improve the applicability of these interpolymers. Such enhancements may be accomplished via additives or the like, but it is desirable to develop technologies to provide improvements in processability or performance without the addition of additives or further improvements than can be achieved with the addition of additives. To date, the possible advantages of blending to provide materials with superior properties have not been identified.
There is a need to provide materials based on .alpha.-olefin/vinylidene aromatic monomer interpolymers with superior performance characteristics to the unmodified polymers, which will further expand the utility of this interesting class of materials.
The present invention pertains to a blend of polymeric materials comprising comprising 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, and .alpha.-olefin having from 2 to about 20 carbon atoms; and or and/or one or more hindered aliphatic vinylidene monomers, or modifier, or
The present invention also pertains to expandable compositions comprising interpolymer comprising 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, and .alpha.-olefin having from 2 to about 20 carbon atoms; and one or more vinylidene aromatic monomers and/or one or more hindered aliphatic vinylidene monomers, or at least one interpolymer of one or more vinylidene aromatic monomers and/or one or more hindered aliphatic vinylidene monomers and optionally one or more polymerizable ethylenically unsaturated monomers other than a more vinylidene aromatic monomer or more hindered aliphatic vinylidene monomer.
The blends and expandable materials of the present invention can comprise, consist essentially of or consist of any two or more of such interpolymers enumerated herein. Likewise, the interpolymers can comprise, consist essentially of or consist of any two or more of the enumerated polymerizable monomers.
These blends provide an improvement in one or more of the polymer properties such as, but not limited to, mechanical performance and/or melt processability.
The term "interpolymer" is used herein to indicate a polymer wherein at least two different monomers were polymerized to make the interpolymer.
The term "substantially random" in the substantially random interpolymer comprising an .alpha.-olefin and a vinylidene aromatic monomer or hindered aliphatic vinylidene monomer as used herein means that the distribution of the monomers of said interpolymer can be described by the Bernoulli statistical model or by a first or second order Markovian sta
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Cheung Yunwa W.
Chum Pak-Wing S.
Clingerman George P.
Gathers John J.
Guest Martin J.
The Dow Chemical Company
Wilson Donald R.
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