ABS based resin and its prepn method

A kind of technology of base resin and molded product, applied in the field of ABS base resin and its preparation

Inactive Publication Date: 2003-07-16
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has now surprisingly been found that the various quality-related problems of ABS-based resins can be overcome by controlling the morphology of the rubber particles in the molded product into a specific shape, rather than relying on general methods, i.e. molding conditions, mold design Or the above-mentioned improved method of blending percentage, thus leading to the present invention

Method used

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  • ABS based resin and its prepn method
  • ABS based resin and its prepn method
  • ABS based resin and its prepn method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 0

[0196] Example 0 describes a method of controlling the quality of ABS-based resins.

[0197] The preparation method of a.ABS base resin

[0198] Prepare single-batch solution every hour, and this solution is made of 75.5 parts by weight styrene, 24.5 parts by weight acrylonitrile, 5 parts by weight ethylbenzene, 7 parts by weight rubber polymer (styrene-butadiene block copolymer, when 5wt% In the form of a styrene solution, when measured at 25°C, its solution viscosity is 10 centistokes (cst)), 0.05 parts by weight of 1,1-bis(tert-butyl peroxide)-3,3,5-trimethyl Composition of cyclohexane (as organic peroxide) and 0.2 parts by weight of mercaptan. The solution thus obtained was polymerized in a three-stage reactor consisting of three stirred polymerization tanks arranged in a row.

[0199]Each batch of solution thus prepared was fed continuously to the first kettle. In the first tank, the stirring speed and reaction temperature were set at 350 rpm and 110°C, respectively. ...

Embodiment A

[0204] Example A describes an illustrative preparation of an ABS-based resin (A) which gives moldings with a high gloss with slight unevenness.

[0205] The preparation method of a.ABS base resin

[0206] Prepare single-batch solution, this solution is made of 75.5 parts by weight styrene, 24.5 parts by weight acrylonitrile, 5 parts by weight ethylbenzene, 7 parts by weight rubber polymer (styrene-butadiene block copolymer, with 5wt% styrene The solution form has a solution viscosity of 10 centistokes when measured at 25° C.), 0.05 parts by weight of 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane (as an organic peroxide ) and 0.2 parts by weight of mercaptan. The solution thus obtained was in the same three-stage stirred series reactor as used in Example 0-1.

[0207] The batch of solutions thus prepared was continuously fed into the first polymerization reactor. In the reactor, the stirring speed and reaction temperature were set at 70-400 rpm and 110° C., respective...

Embodiment A-1

[0211] Through an extruder, 50 parts by weight of the polymer sample α1 and 50 parts by weight of the polymer sample α2 were melted and kneaded. The material thus obtained was injection molded at a cylinder temperature of 230°C and a mold temperature of 50°C. The molded article thus obtained was found to contain 0.8% of B particles and had a gloss value with a standard deviation as low as 3.0%, indicating slight unevenness in gloss. The results are shown in Table 4.

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Abstract

A molding of an ABS-based resin has rubber particles located at a depth of 0.5-1.5 mu m from a surface of the molding, and the particles morphologically comprise at least the following two types of particles: (1) A particles having an a/b ratio not greater than 1.5, wherein a and b represent a major axis and a minor axis, respectively, and (2) B particles having an a/b ratio not smaller than 5, wherein a and b have the same meanings as defined above. When a section taken by a microtome in parallel with a surface of the molding is observed in an electron micrograph, and assuming that the total area of the rubber particles as observed in the electron micrograph is 100%, the total area of the A particles accounts for at least 10% and that of the B particles is in a range of 0.01-90%.

Description

[0001] This application is a divisional application of an invention patent application with the filing date of December 27, 1994, the application number of 94120480.4, and the invention title of "ABS-based resin quality control method and ABS-based resin molded product". technical field [0002] The present invention relates to ABS-based resins for the preparation of molded articles with special morphology and methods for their preparation. [0003] The term "molded article" as used herein should be interpreted in a broad sense wherein it may include not only molded articles but also extruded or otherwise shaped articles. [0004] The invention also relates to the provision of the following moldings made of ABS-based resins and in their respective qualities: [0005] (A) ABS-based resin molded article having a surface with slightly uneven gloss and high gloss; [0006] (B) ABS-based resin moldings having slight unevenness in falling weight impact strength...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/00C08F279/04C08L55/02
CPCC08F6/001C08F279/04C08L55/02
Inventor 岩本宗中岛明彦高久真人森田尚夫安藤敏彦白藤朋史内田睦子
Owner MITSUI CHEM INC
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