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Block polymer and antistatic agent comprising the same

A technology of block polymers and hydrophilic polymers, applied in the field of antistatic agents, can solve problems such as mold pollution, reduction of resin mechanical strength and moldability, and insufficient compatibility

Inactive Publication Date: 2006-09-06
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the disadvantage of this method is that polyether ester amide is hardly oriented on the molding surface of crystalline polyolefin, and in extrusion molding or compression molding without shearing action, a large amount of antistatic agent such as polyether ester must be added. Amide
[0007] Moreover, the compatibility is insufficient, which creates problems of mold contamination and / or roll contamination during the molding step
[0008] In addition, since a large amount of compatibilizer is required to improve the compatibility with the resin, the mechanical strength and moldability of the resin are reduced, and this problem has not been solved so far.

Method used

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preparation example Construction

[0338] As for the preparation method of the block polymer (A2), there can be mentioned a method including reacting (a4)-(a6) with (b2), and including, for example, the presence of (a4) in the process of preparing (b2) The following is a method of reacting the precursor (reactant) of (b2) to simultaneously form the block of the polymer (b2) and the block polymer (A2).

[0339] In the case where (b2) is the polyether ester amide (b2-1), its preparation method is not particularly limited, but includes the following methods.

[0340] Those block polymers (A2) in which (b2) are polymer segments other than polyether ester amide (b2-1) can be prepared in the same manner.

[0341] Method 1: A method including polymerization reaction of (a4-1) represented by general formula (9) and polyether ester amide (b2-1) at 200-250°C under reduced pressure.

[0342] Method 2: A method including polymerization reaction of (a4-1), (Q1) and (b1-1) at 200-250°C under reduced pressure.

[0343] Method 3: ...

preparation Embodiment 1

[0470] Under nitrogen, 85 parts of low-molecular-weight polypropylene having an Mn value of 2,500 and a density of 0.89 obtained by the thermal degradation method was melted with 15 parts of maleic anhydride at 200° C. and reacted for 20 hours.

[0471] Then, excess maleic anhydride was distilled off under reduced pressure to obtain acid-modified polypropylene (a1-1①).

[0472] The acid value of (a1-1①) is 39.8, and the Mn value is 2,800.

preparation Embodiment 2

[0474]At 160℃, the low molecular weight polypropylene (80 parts) with Mn value of 2,500 and density of 0.89 obtained by thermal degradation method was melted together, and then 7 parts of maleic anhydride and 14 parts of 12-aminododecanoic acid were added. The reaction was carried out at 160°C for 1 hour under nitrogen.

[0475] The reaction was continued for another 20 hours at 200°C to obtain acid-modified polypropylene (a1-1②).

[0476] The acid value of (a1-1②) is 32.1, and the Mn value is 2,800.

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Abstract

A thermoplastic resin which comprises a resin, especially a polyolefin, and a block polymer comprising polyolefin blocks and hydrophilic polymer blocks and finely dispersed therein without the need of a compatibilizing agent and gives a molding having permanent antistatic properties even when it is molded under shear-free conditions and even when the block polymer amount is small, and which does not foul the molds or rollers during molding because of satisfactory compatibility and has excellent mechanical strength. The block polymer is characterized by having a structure comprising blocks of a polyolefin (a) alternating with blocks of a hydrophilic polymer (b) having a volume resistivity of 10<5> to 10<11> OMEGA .cm. An antistatic agent comprising the block polymer is provided. The resin composition comprises the block polymer and a thermoplastic resin. A molded article obtained by coating or printing a molding of a resin composition containing the block polymer is further provided.

Description

[0001] This application is a divisional application with an application date of February 10, 2000, an application number of 00806003.7, and an invention title of "block polymer and antistatic agent containing it". Technical field [0002] The invention relates to a block polymer and an antistatic agent containing it. [0003] More specifically, the present invention relates to a block polymer used as an antistatic agent suitable for coating or printing molded articles and an antistatic agent containing it. Background technique [0004] Any block polymer having a repeating structure comprising a polyolefin block and a hydrophilic polymer block is not known in the prior art. [0005] On the other hand, methods commonly used to prepare thermoplastic resins with permanent antistatic properties such as polyolefins include adding an antistatic agent such as polyetheresteramide to the resin, and are known to be used to improve the relationship between polyolefin and polyetheresteramide. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08L101/12C09K3/16
Inventor 樋口彰一千田英一
Owner SANYO CHEM IND LTD
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