Natural rubber-containing thermoplastic resin composition and molded article thereof

A thermoplastic resin and natural rubber technology, applied in the field of thermoplastic resin composition and its molded products, can solve the problem that natural rubber latex cannot obtain impact resistance improvement effect

Active Publication Date: 2015-06-03
TORAY IND INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this document, it is also pointed out that natural rubber latex that has not undergone deproteinization treatment fails to obtain a high impact resistance improvement effect

Method used

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  • Natural rubber-containing thermoplastic resin composition and molded article thereof
  • Natural rubber-containing thermoplastic resin composition and molded article thereof
  • Natural rubber-containing thermoplastic resin composition and molded article thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0346] Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited to these Examples.

[0347] (1) Determination of weight average particle size of natural rubber and synthetic rubber

[0348] The natural rubber latex and the synthetic rubber latex were diluted and dispersed in an aqueous medium, and the particle size distribution was measured with a laser scattering diffraction particle size distribution measuring device "LS 13 320" (Beckman Coulter Inc.). The weight-average particle diameters of natural rubber and synthetic rubber were calculated from this particle diameter distribution. In addition, for natural rubber, the ratio of natural rubber particles having a particle size of 1.0 μm or more to all natural rubber particles was calculated from the particle size distribution.

[0349] (2) Determination of grafting rate

[0350] Add 80ml of acetone to about 1g of the graft copolymer (A) sample (m: sample mass), r...

reference example 1

[0411] (Reference Example 1) Graft Copolymer [A-(1)]

[0412] In the presence of 50 parts by mass (solid content conversion) [R-(1)] of polybutadiene latex with a weight average particle diameter of 0.3 μm, 130 parts by mass of pure water, 0.4 parts by mass of sodium formaldehyde sulfoxylate (sodium formaldehyde sulfoxylate) Parts by mass, 0.1 part by mass of sodium edetate, 0.01 part by mass of ferrous sulfate, and 0.1 part by mass of sodium pyrophosphate were put into a reaction container, and the air in the reaction container was replaced with nitrogen. The inside of the reaction vessel was adjusted to 60° C. and stirred. At the same time, a monomer mixture of 6.7 parts by mass of styrene, 2.5 parts by mass of acrylonitrile, and 0.046 parts by mass of tert-dodecylmercaptan was first added over 0.5 hours (the amount of the monomer mixture was The amount corresponds to 18.4% by mass of the entire monomer mixture.). Next, addition of an initiator mixture consisting of 0.32 pa...

reference example 2

[0413] (Reference Example 2) Graft Copolymer [A-(2)]

[0414] 37.5 parts by mass of polybutadiene latex with a weight average particle diameter of 0.3 μm (in terms of solid content) and 12.5 parts by mass of natural rubber latex with a weight average particle diameter of 0.6 μm at a ratio of 24 mass % of particles larger than 1.0 μm (Converted to solid content) In the presence of [R-(2)], 130 parts by mass of pure water, 0.4 parts by mass of sodium formaldehyde sulfoxylate, 0.1 part by mass of sodium edetate, 0.01 part by mass of ferrous sulfate, and coke 0.1 parts by mass of sodium phosphate was put into the reaction container, and the air in the reaction container was replaced with nitrogen. Then, the temperature in the reaction vessel was adjusted to 60° C. and stirred, and at the same time, a monomer mixture of 5.84 parts by mass of styrene, 2.16 parts by mass of acrylonitrile and 0.03 parts by mass of tert-dodecylmercaptan was added over 0.5 hours ( The amount of this mo...

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Abstract

The present invention addresses the problem of providing a natural rubber-containing thermoplastic resin composition which uses a natural rubber latex and has physical properties achieving excellent balance among impact resistance, fluidity and color tone, without requiring a complicated deproteinization process for natural rubbers. A solution of the problem is a natural rubber-containing thermoplastic resin composition which contains a graft copolymer (A) that is obtained by graft polymerizing a vinyl monomer mixture (a), which contains at least an aromatic vinyl monomer, to a rubber polymer (R) that is formed of 10-70% by mass of a natural rubber having a weight average particle diameter within the range of 0.3-1.2 μm and 30-90% by mass of a synthetic rubber having a weight average particle diameter within the range of 0.2-0.4 μm. This natural rubber-containing thermoplastic resin composition is characterized in that: the natural rubber particles contain natural rubber particles having particle diameters of 1.0 μm or more in an amount of 5% by mass or more; and the inner graft rate of the rubber polymer (R) particles having particle diameters of 1.0 μm or more is 20% or more.

Description

technical field [0001] The present invention relates to thermoplastic resin compositions containing natural rubber and molded articles thereof. Background technique [0002] A balance between mechanical strength such as impact resistance and rigidity, and moldability is required for thermoplastic resin compositions used in fields such as automotive materials, home appliances, and daily necessities. Therefore, in these application fields, rubber-reinforced thermoplastic resin compositions containing rubbery polymers represented by high impact polystyrene (HIPS, High impact polystyrene) and acrylonitrile-butadiene-styrene (ABS) resin has been widely used. [0003] On the other hand, from the viewpoint of carbon neutrality, there is an increasing demand for resin compositions using natural-derived raw materials typified by polylactic acid. As an example of applying a natural-derived raw material to a thermoplastic resin composition containing a rubber-like polymer, there is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/04C08F253/00C08L57/00
CPCC08F253/00C08L51/04C08L33/08C08L35/06C08L25/12C08L55/02C08L23/08C08L7/00C08L25/08C08L33/14C08L67/02
Inventor 柴田拓哉小山雅史大胁隆正白川信明内藤祉康齐藤彰高崎忠胜城谷幸助上田隆志森户昭等
Owner TORAY IND INC
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