Propylene-based compositions of enhanced appearance and flowability

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

Active Publication Date: 2016-10-12
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 compositions of enhanced appearance and flowability
  • Propylene-based compositions of enhanced appearance and flowability
  • Propylene-based compositions of enhanced appearance and flowability

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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 o...

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Abstract

The present disclosure relates to a class of impact copolymer polypropylene (ICP) compositions exhibiting the advantageous combination of excellent tiger (flow) marking performance in large/long molded parts, very low gels count and exceptional mold flowability (high MFR) despite the high viscosity ratio (e.g., >4) between rubber and propylene based matrix phases. Furthermore, it has been surprisingly found that the inventive compositions are associated with a low gels count even when using a quite coarse mesh wire screen, e.g., 60 mesh wire screen, independent of screw type e.g., twin or single screw. Finally, the inventive compositions exhibit significantly reduced the levels of volatiles, and excellent stiffness-impact balance used as standalone materials or in filled compounds. The significantly reduced number of large gels leads to excellent surface appearance and paintability of the molded parts. The composition has the advantage of process simplicity, process efficiency and simplicity of compositional structure.

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 Applications(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
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