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Propylene-based composition with enhanced appearance and excellent molded fluidity

A composition, propylene copolymer technology, applied in the field of propylene-based compositions, capable of solving the problem of not teaching or achieving the properties required for gel counting

Active Publication Date: 2019-07-26
BRASKEM AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Many other inventions (e.g., U.S. Pat. Nos. 6,441,081, 6,667,359, and 7,064,160) teach ICP compositions with excellent tiger spot properties, but they do not teach or achieve the desired performance in terms of gel count, while they claim the composition's The structure is substantially different from the composition of the present invention

Method used

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  • Propylene-based composition with enhanced appearance and excellent molded fluidity
  • Propylene-based composition with enhanced appearance and excellent molded fluidity
  • Propylene-based composition with enhanced appearance and excellent molded fluidity

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Embodiment approach

[0093] Still other embodiments of the present invention include methods of making impact copolymer polypropylene (ICP) compositions, such as any of the various embodiments of the ICP compositions described herein. According to certain embodiments, the process comprises: polymerizing propylene in the presence of a Ziegler-Natta catalyst in a first stage comprising at least one bulk or gas phase polymerization reactor or a combination thereof to produce a polypropylene-based matrix, For example, a matrix having a melt flow rate (MFR) greater than 125 g / 10 min; degassing and then transferring the polypropylene-based matrix phase from the first stage to a second stage comprising at least one gas phase reactor; and in the second stage polymerizes an ethylene propylene rubber (EPR) phase in the presence of a polypropylene-based matrix to produce an EPR phase dispersed in a polypropylene-based matrix to produce an impact-resistant polypropylene copolymer composition, wherein the EPR p...

Embodiment

[0101] The invention will now be described in the following non-limiting examples, as summarized in the tables and figures below. Tables 4-7 below and Figure 1-3 Examples are included to demonstrate the invention. Some observations of the disclosed embodiments include:

[0102] Table 4 shows that for I.V. ratios > 4 between the EPR phase and the propylene-based matrix, the macrogel counts are surprisingly low ("excellent" gel performance), while the tiger spot performance is simultaneously excellent (at 0.1 rad / s 180℃, tanδ<5). As mentioned earlier, the I.V. of the EPR phase is defined in the present invention as the I.V. of the xylene soluble fraction precipitated from acetone. It has been experimentally confirmed that the I.V. of the propylene-based (matrix) phase is here approximately equal to the I.V. of the XIS fraction of the composition. At a given composition MFR, tan δ at low frequency (at 0.1 rad / s, 180°C) reflects the combination of various molecular features of...

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Abstract

The present invention relates to a class of impact polypropylene copolymer (ICP) compositions which, despite a high viscosity ratio (e.g. >4) between the rubber phase and the propylene-based Favorable combination of good tiger (flow) spot properties, very low gel count and exceptional molded flow (high MFR). Furthermore, it has also surprisingly been found that even when relatively coarse mesh wire screens (e.g., 60 mesh wire screens) are used, the compositions of the present invention are associated with low gel counts, whereas screw types (e.g., twin screw) are associated with low gel counts. or single screw) irrelevant. Finally, the compositions of the present invention exhibit significantly reduced levels of volatiles and an excellent stiffness-impact balance when used as stand-alone materials or filled compounds. The significantly reduced number of macrogels leads to excellent surface appearance and coating properties of molded parts. The composition of the present invention is prepared by bulk / gas reactor method (i.e. non-slurry / non-solvent method), which has simple process, process efficiency and compositional structure relative to the complexity of the structure and preparation method of the composition in the prior art The advantages.

Description

technical field [0001] The present invention relates to exhibiting superior surface appearance through the combination of enhanced tiger (flow) marking properties and low gel count with excellent mold flowability and stiffness-impact balance Propylene-based compositions, methods for their preparation, and articles made therefrom. Background technique [0002] In order to achieve the enhanced tiger-spotting properties of impact polypropylene copolymer (ICP) compositions for injection molding of large / long parts typically used in automotive applications (as described below), it is often necessary to incorporate very high molecular weight (MW) (or equivalent Rubber phases of high intrinsic viscosity (I.V.), such as ethylene-propylene (EPR) copolymers or copolymers of propylene with other α-olefins), which lead to rubber phases and matrices (for example, propylene-based polymers such as The high viscosity ratio between polymer polypropylene (HPP)) causes high counts of bulky po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/10C08L23/12C08L23/16
CPCC08L23/12C08L2207/02C08L23/16C08L23/0815
Inventor 杰弗里·S.·萨拉克丽塔·A.·马耶夫斯基
Owner BRASKEM AMERICA