Modified propylene polymer

A technology for modifying propylene polymers, applied in the field of modified propylene polymers, which can solve problems such as increased fluidity, unusable modified propylene polymers, and low molecular weight, etc., and achieves an excellent balance effect

Inactive Publication Date: 2012-09-26
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the molecular weight of the modified propylene polymer obtained after the grafting reaction becomes significantly lower than that of the propylene polymer before modification, resulting in a marked increase in fluidity and a marked decrease in melt tension.
For this reason, modified propylene polymers have the following problems: their moldability is inferior to that of propylene polymers and they no longer retain the inherent mechanical properties of propylene polymers
[0010] The modified propylene polymer disclosed in Patent Document 1 has a high melt tension, but the modified propylene polymer cannot be alloyed with a different type because its carboxylic acid as a polar component has been mixed with other polymer compounds React and be exhausted
[0011] Moreover, although the grafted amount of the modified propylene polymer disclosed in Patent Document 2 is increased, the high fluidity of the modified propylene polymer is not disclosed, and the disclosed polymer has a balance between fluidity and melt tension. Balance is not necessarily satisfactory

Method used

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  • Modified propylene polymer
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Examples

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preparation example Construction

[0040] In the preparation of the propylene polymer (A), in order to remove the residual solvent contained in the propylene polymer (A) or the ultra-low molecular weight oligomers produced during the preparation process, the propylene polymer (A) can be Drying is performed at a temperature at which the propylene polymer (A) melts. Examples of drying methods include those disclosed in JP 55-75410A and JP 2565753.

[0041] · Random copolymerization

[0042] As mentioned above, the random copolymer in the present invention includes: a random copolymer composed of a structural unit derived from propylene and a structural unit derived from ethylene; a random copolymer composed of a structural unit derived from propylene and a structural unit derived from Random copolymers composed of structural units of other α-olefins; random copolymers composed of structural units derived from propylene, structural units derived from ethylene, and structural units derived from other α-olefins oth...

Embodiment 1

[0147] [Example 1, Comparative Example 1]

[0148] Mix the propylene polymer (A), the ethylenically unsaturated bond-containing compound (B) and the organic peroxide (C) uniformly, and then use an extruder to perform heat treatment under the conditions given in Table 1 to obtain modified propylene polymer. A single-screw extruder was used as the extruder. The preset barrel temperature is 80° C., and the preset screw speed is 75 rpm. The blending ratio of the propylene polymer (A), the ethylenically unsaturated bond-containing compound (B) and the organic peroxide (C) and the physical properties of the resulting modified propylene polymer (A) are given in Table 1. out.

Embodiment 2-5

[0149] [Example 2-5, Comparative Example 2]

[0150] A modified propylene polymer was obtained in the same manner as in Example 1, except that the preset temperature of the barrel was set to 40° C. and the screw speed was set to 65 rpm in the corresponding Example. The physical properties of the obtained modified propylene polymer are shown in Table 1.

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Abstract

Disclosed is a modified propylene polymer excellent in the balance between melt tension and flowability, the modified propylene polymer being obtainable by reacting 100 parts by weight of a propylene polymers (A), from 0.1 to 50 parts by weight of an ethylenically unsaturated bond-containing compounds (B), and from 0.01 to 20 parts by weight of an organic peroxide (C), wherein a melt flow rate measured at 230 DEG C. under a load of 2.16 kg and a melt tension measured at 190 DEG C. satisfy the following formula (1): MT>9MFR(-0.9) (1).

Description

technical field [0001] This invention relates to modified propylene polymers. Background technique [0002] It is known that modified polyolefin resins can be obtained by grafting polar monomers such as maleic anhydride, glycidyl methacrylate onto propylene polymers. [0003] For example, Patent Document 1 discloses a modified propylene polymer which can be obtained by combining a functional compound having a carboxylic acid group with a compound having at least two or more functional groups reactive with carboxylic acid in the same molecule. and organic peroxides; then, they are subjected to a grafting reaction. [0004] Patent Document 2 discloses a modified propylene polymer obtainable by melt-mixing a mixture of a propylene-containing polymer, a metal salt of (meth)acrylic acid, and an organic peroxide; stick reaction. [0005] Related literature [0006] patent documents [0007] [Patent Document 1]: JP 2003-171515A [0008] [Patent Document 2]: JP 2009-179666A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F8/46C08F8/00
CPCC08F8/00C08F10/06C08F255/02C08F8/46C08F222/06
Inventor 中岛浩善岛野光吉
Owner SUMITOMO CHEM CO LTD
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