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Polyolefin blend composition and articles prepared therefrom

A technology of olefin copolymers and compositions, which is applied in the field of polyolefin blend compositions, and can solve problems such as damage to the transparency and blurring of molded products

Active Publication Date: 2016-10-12
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of impact modifiers can greatly impair the clarity of molded articles and can be very hazy

Method used

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  • Polyolefin blend composition and articles prepared therefrom
  • Polyolefin blend composition and articles prepared therefrom
  • Polyolefin blend composition and articles prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] The following examples illustrate the invention but are not intended to limit the scope of the invention.

[0041] The formulation components are shown in Table 1.

[0042] Table 1

[0043]

[0044] The formulation components shown in Tables 1 and 2 were dry tumble blended to form comparative blend compositions A-D and inventive blend compositions 1-7.

[0045] Table 2

[0046]

[0047] Comparative blend compositions A-D and inventive blend compositions 1-7 were respectively formed into injection molded samples, comparative examples A-D and inventive samples 1-7, based on the following method and the conditions shown in Table 3.

[0048] Comparative Blend Compositions A-D and Inventive Blend Composition 17 were injection molded using a Krasuss Maffei KM 110-390 / 390CL Injection Molding Machine equipped with a single shot mold base.

[0049] table 3

[0050] Barrel and mold temperature

Hopper area (℃)

30

Zone 1 temperature (℃)...

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Abstract

The invention provides a polyolefin blend composition, a method for preparing the composition and articles prepared therefrom. The polyolefin blend composition according to the present invention comprises: (a) 75 to 97% by weight of one or more random propylene copolymers having a DSC melting point in the range of 120°C to 160°C, and Melt flow rate (MFR) in the range of 5 to 120 g / 10 minutes; (b) 3 to 25% by weight of one or more ethylene alpha-olefin copolymers having A melt index (I2) within, a density in the range of 0.860 to 0.910 g / cm3 and a molecular weight (Mw) in the range of 10000 to 50000 g / mole, wherein the ethylene alpha-olefin copolymer is a homogeneously branched copolymer, and wherein said ethylene alpha-olefin copolymer is linear or substantially linear; (c) optionally from 5 to 15 weight percent of one or more propylene alpha-olefin interpolymers having an interpolymer of less than A DSC melting point of 110°C, a heat of fusion of less than 50 Joules / gram, a degree of crystallinity in the range of at least 1% to 40% by weight, and a melt flow rate of less than 80 g / 10 minutes.

Description

[0001] References to related applications [0002] This application claims the benefit of US Provisional Application No. 61 / 623,305, filed April 12, 2012. field of invention [0003] This application relates to polyolefin blend compositions, methods for making the compositions, and articles made therefrom. Background of the invention [0004] Polypropylene is used in a large number of everyday articles such as, for example, storage containers, tubs and ice cream containers. However, one disadvantage of polypropylene homopolymers and / or random polypropylene copolymers (RCP) in such end-use applications is their relatively high glass transition temperature, around 0°C. This relatively high glass transition temperature renders these materials brittle, especially at subzero temperatures. RCP is typically the material of choice for injection molded clear containers. Due to RCP's inherent high crystallinity and high glass transition temperature, injection molded articles made f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14
CPCC08L23/142C08L2205/025C08L23/0815C08L23/14C08L2205/03
Inventor G·M·李C·利比尚K·L·沃尔顿小雷蒙德·L·拉克索W·J·布朗
Owner DOW GLOBAL TECH LLC
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