Process for producing graft copolymer latex

A graft copolymer and graft polymerization technology, applied in the field of preparation, can solve the problems of time-consuming, reduced production efficiency, restrictions on types of rubber latex and defoamer, etc.

Inactive Publication Date: 2003-05-14
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former method takes time to reduce the concentration of unreacted monomers, so there is a problem that the production efficiency is lowered.
In the latter method, the types of applicable rubber latex and the types of defoaming agents are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The rubber latex obtained by the above method was put into a glass vacuum-resistant container with an inner capacity of 3 liters, and 0.30 parts of sodium sulfate was added per 100 parts by weight of the solid content of the rubber latex.

[0047] Then, raise the temperature of the rubber latex to 60°C, stir under the condition of 400 rpm, and decompress with a vacuum pump with an exhaust capacity of 18 liters / hour. When the decompression degree reaches 150 Torr, the rubber The distance from the rubber latex interface to the upper end of the foam layer when the most foam layer is accumulated on the surface of the latex emulsion (hereinafter referred to as the height of the foam layer).

[0048] When the degree of reduced pressure reached 150 Torr, the vacuum pump was stopped, and the inner pressure of the polymerization vessel was raised to atmospheric pressure with nitrogen gas. Thereafter, the rubber latex was sampled, and the amount of unreacted monomers and the part...

Embodiment 2

[0051] Except that the amount of sodium sulfate added in the rubber latex was changed to 0.59 parts per 100 parts of the solid content of the rubber latex, the same operations as in Example 1 were carried out, and the results are shown in Table 1 and Table 2.

Embodiment 3

[0053] Except that the electrolyte added in the rubber latex was changed to 60 parts of oxalic acid per 100 parts of the solid content of the rubber latex, other operations were carried out in the same manner as in Example 1. The results are shown in Table 1 and Table 2.

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Abstract

There is provided a process for producing graft copolymer latex. In case of removing non-reacted monomer from a rubber latex before graft polymerization, non-reacted monomer is removed in a short time by adding an electrolyte to control foaming of a rubber latex, and a graft copolymer latex is prepared without decreasing productivity.

Description

technical field [0001] The present invention relates to the preparation method of the graft copolymer latex that adopts graft polymerizable monomer and rubber latex to carry out graft polymerization, for example, relates to the ABS (acrylonitrile-butadiene-styrene) resin and MBS of emulsion polymerization (Methyl methacrylate-butadiene-styrene) resin and the like. Specifically, it relates to a method for producing a graft copolymer latex without reducing quality and yield by removing unreacted substances in rubber latex before graft polymerization. Background technique [0002] As we all know, in the copolymer latex prepared by graft polymerization of monomers that can be graft-copolymerized with conjugated diene rubber and conjugated diene rubber, there are ABS resin, MBS resin, high impact polystyrene, etc. A variety of resins, the main purpose is to improve impact resistance. [0003] In such a method, if the graft polymerization is carried out i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/02C08F291/02
CPCC08F279/02C08F291/02
Inventor 野田光永长谷川三胜上野雅邦
Owner KANEKA CORP
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