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Method for producing polyolefin-polyamide resin composition

a polyolefin and polyamide technology, applied in the field of manufacturing polyolefinpolyamide resin composition, can solve the problems of insufficient antioxidant with a low melting point, inability to long-time run, and extremely bad productivity, and achieve excellent productivity and long-time running

Inactive Publication Date: 2006-10-19
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method of manufacturing polyolefin-polyamide resin composition with a large amount of discharge, long-time running, and excellent productivity. The method involves melting and kneading, extruding, and drafted drawing or rolling a polyolefin, polyamide, silane coupling agent, and two antioxidants with different melting points. By combining the two antioxidants, the method can effectively prevent scorches and improve the efficiency of the extruder. This method can also reduce the frequency of cleaning and improve the overall productivity of the manufacturing process.

Problems solved by technology

Such the antioxidant with a low melting point can not function sufficiently while kneading and reacting in a biaxial extruder.
Therefore, gelation of polyolefin (decomposition when polypropylene is employed) occurs and causes scorches in the extruder, resulting in a small amount of discharge and a large amount of strand cut.
It is also required to frequently clean a device for removing scorches from the extruder, which causes a problem associated with impossibility of long-time running and extremely bad productivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0042] Added into 100 weight parts of a low density polyethylene [(F522 available from Ube Industries, Ltd having a melting point of 110° C., MFR=5.0 (g / 10 min.)] as the component (a) are: 1.0 weight part of a γ-methacryloxy propyl trimethoxy silane [KBM503 available from Shin-etsu Silicone] as the component (c); 0.5 weight part of a pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl) propionate [Irganox 1010 available from Ciba Specialty Chemicals having a melting point of 110° C.] as the component (d); 0.5 weight part of a 4,4′-butylidene bis(3-methyl-6-t-butylphenol) [Sumilizer BBMS available from Sumitomo Chemical Industry having a melting point of 209° C.] as the component (e); and 0.025 weight part of a di-α-cumyl peroxide [Percumyl D40]. They are kneaded in a Banbury mixer for reaction at 170° C., and pelletized in a uniaxial extruder at 170° C. to produce a silane modified polyethylene. Into the produced silane modified polyethylene, 50 weight parts of nylon 6 [1030B...

example 2

[0043] As the component (e), 0.5 weight part of a 2-mercaptobenzoimidazole [Sumilizer MB available from Sumitomo Chemical Industry having a melting point of 285° C.] is employed instead of 4,4′-butylidene bis(3-methyl-6-t-butylphenol). As the component (b), 50 weight parts of nylon 66 [2020B available from Ube Industries, Ltd having a melting point of 255-265C.] is employed instead of nylon 6. The kneading and reacting temperature in the biaxial kneader is set at 300° C. With these exceptions, a polyolefin-polyamide resin composition is produced in the same manner as in Example 1. Amount of Discharge, Continuous Running Time, Uniformity of Strand Diameter, Cut of Strand, Generation of Gum, Scorch in Extruder, Yield, and Daily Production at the time are shown in Table 1.

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Abstract

The invention provides a method of manufacturing polyolefin-polyamide resin composition, which method has a large amount of discharge and is capable of long-time running and excellent in productivity. The method of manufacturing polyolefin-polyamide resin compositions comprises melting and kneading, extruding, and drafted drawing or rolling (a) a polyolefin, (b) a polyamide, (c) a silane coupling agent, (d) a first antioxidant with a melting point of 70-170° C., and (e) a second antioxidant with a melting point of 180-300° C. to disperse the polyamide (b) in the form of fiber with an average fiber diameter of 1 μm or less in the polyolefin (a) to finish the composition in the form of pellets.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method of manufacturing polyolefin-polyamide resin composition suitably available in materials for reinforcing rubbers and resins. [0003] 2. Description of the Related Art [0004] For improvements in elastic modulus and mechanical strength of rubbers and resins, glass fibers or inorganic fillers are combined. Although the combination of these materials may provide improvements in stiffness, elastic modulus, strength, and creep-resistance, it worsens appearances of moldings and results in heavy moldings. [0005] Japanese patent publications Nos. JP-A 7-238189 and JP-A 9-59431 disclose composition, which comprise thermoplastic polyamide fiber dispersed as fine fiber in a matrix of polyolef in and rubber-like polymer. These composition can be improved in mechanical property when a rubber is combined. The rubber to be combined is limited, however, and maybe gelled while kneading. In part...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D01F1/02B29B9/12B29C48/05C08L23/02C08L33/02C08L77/00C08L77/02C08L77/06
CPCB29B9/12B29B9/14B29K2023/06B29K2023/083B29K2023/12B29K2077/00C08L23/02C08L23/06C08L33/02C08L77/00C08L77/02C08L77/06C08L2666/20C08L2666/06C08K5/10C08K5/13C08K5/14C08K5/54C08L2207/066C08L2312/00B29C48/05B29C48/832C08K5/005
Inventor KAWAGUCHI, NORISHIGEYAMAGUCHI, MASASHI
Owner UBE IND LTD
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