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Method for making multiphase polymer compositions

A technology of heterogeneous polymers and compositions, applied in the field of preparation of such compositions, can solve problems such as low output and high processing temperature

Active Publication Date: 2021-10-19
MILLIKEN & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This tradeoff usually means that the melt flow rate is not increased to the desired level, which requires higher processing temperatures and / or results in lower yields

Method used

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  • Method for making multiphase polymer compositions
  • Method for making multiphase polymer compositions
  • Method for making multiphase polymer compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] The following examples illustrate the modification and performance enhancement of heterophasic polyolefin compositions achieved in accordance with the present invention.

[0106] Twelve heterophasic polymer compositions were prepared as described in Tables 1 and 2 below.

[0107] Table 1. Heterophasic polypropylene copolymer formulations

[0108]

[0109] The polypropylene copolymer used in these examples was Prime Polymer J707P with a rubber content of about 14.5%. 1010 is the primary antioxidant, available from BASF. 168 is a secondary antioxidant available from BASF. DHT-4V is a hydrotalcite available from Kisuma Chemicals. Varox DBPH is an organic peroxide available from the R.T. Vanderbilt Company. The nucleating agents used in the preparation of these samples were sodium benzoate (N.A.1), sodium 2,2′-methylenebis-(4,6-di-tert-butylphenyl)phosphate (N.A.2), and sodium benzoate and Nucleating agent for mixtures of aluminum 2,2'-methylenebis-(4,6-di-tert-bu...

Embodiment 2

[0119] The following examples illustrate the modification and performance enhancement of heterophasic polyolefin compositions achieved in accordance with the present invention.

[0120] Six heterophasic polymer compositions were prepared. The general formulations of these samples are listed in Table 4.

[0121] Table 4. Heterophasic polypropylene copolymer formulations

[0122]

[0123] The nucleating agent used to prepare the samples was aluminum 2,2′-methylenebis-(4,6-di-tert-butylphenyl)phosphate, which was obtained from two different commercial sources (N.A.4 and N.A.5) . Described compatibilizer is C.A.1 among the embodiment 1.

[0124] Each of the compositions listed in Tables 4 and 5 were mixed, extruded and injection molded according to the methods described above. The resulting pellets were tested for melt flow rate and the rods were tested for impact strength, flexural modulus and thermal properties as described above.

[0125] Table 5. Heterophasic polypropy...

Embodiment 3

[0132] The following examples illustrate the modification and performance enhancement of heterophasic polyolefin compositions achieved according to the methods described in the present invention.

[0133] Twelve heterophasic polymer compositions were prepared. The general formulations of these samples are listed in Table 7.

[0134] Table 7. Heterophasic polypropylene copolymer formulations

[0135]

[0136] Each of the compositions listed in Tables 7 and 8 were mixed, extruded and injection molded according to the methods described above. The resulting pellets were tested for melt flow rate and the rods were tested for impact strength, flexural modulus and thermal properties as described above.

[0137] The nucleating agents used to prepare the samples were talc (Jetfine 3CA from Imerys) (N.A.6), aluminum 4-tert-butylbenzoate (N.A.7), calcium cis-cyclohexane-1,2-dicarboxylate Nucleating agent (N.A.8), containing disodium bicyclo[2.2.1]heptane-2,3-dicarboxylate and 2,2′-...

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Abstract

A multiphase polymer composition comprises a propylene polymer phase, an ethylene polymer phase, a compatibilizing agent comprising a fulvene moiety, and a nucleating agent. A method for modifying a multiphase polymer composition comprises the steps of providing a compatibilizing agent, providing a nucleating agent, providing a multiphase polymer composition comprising a propylene polymer phase and an ethylene polymer phase, mixing the compatibilizing agent, the nucleating agent, and the multiphase polymer composition, and generating free radicals in the propylene phase and the ethylene phase. At least a portion of the compatibilizing agent then reacts with free radicals in both the propylene polymer phase and the ethylene polymer phase to form a bond with a propylene polymer in the propylene polymer phase and a bond with an ethylene polymer in the ethylene polymer phase.

Description

technical field [0001] The present invention relates to heterophasic polyolefin compositions having increased melt flow rate and high impact strength, and methods of making such compositions. Of particular interest are modified polypropylene impact copolymers. Background technique [0002] The melt flow rate (MFR) of a polymer resin depends on its molecular weight. In general, increasing the melt flow rate allows the resin to be processed at lower temperatures and to fill complex part geometries. Various prior art methods of increasing melt flow rate involve melt blending the resin with free radical generating compounds such as peroxides in an extruder. When this is done, the weight average molecular weight of the polymer decreases and the MFR increases. However, increasing the melt flow rate by reducing the molecular weight of the polyolefin polymer has in many cases been found to have an adverse effect on the strength of the modified polymer. For example, reducing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/01C08K5/14C08L23/16
CPCC08L23/12C08L2207/02C08K5/0083C08L23/16C08L51/06C08K3/04C08L23/14C08L23/06C08L23/0815C08K5/527C08K5/12C08K5/521C08L23/142C08L2205/02C08L2205/035C08L2205/08
Inventor F·阿尔瓦雷斯K·A·凯勒C·S·拜纳姆S·R·特雷诺尔J·D·斯普林克尔
Owner MILLIKEN & CO
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