Modified polymer latex production method

A manufacturing method, polymer glue technology, applied in the direction of coating, etc., can solve the problem of condensate and other problems, and achieve the effect of inhibiting the generation of condensate

Active Publication Date: 2019-10-15
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the technique of Patent Document 1, when the synthetic polyisoprene and the monomer having a carboxyl group are polymerized in the aqueous phase, there is a case where aggregates are generated when the concentration of the synthetic polyisoprene in the aqueous phase is high. this question

Method used

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preparation example Construction

[0055] The preparation method of modified polymer latex

[0056] The method for producing the modified polymer latex of the present invention comprises adding a carboxyl group-containing compound and an anionic surfactant having a weight-average molecular weight of less than 500 (hereinafter sometimes referred to as "low molecular weight surfactant") to the above-mentioned polyisoprene latex. and anionic surfactants with a weight average molecular weight of 500 or more (hereinafter sometimes referred to as "high molecular weight surfactants") and in the presence of these low molecular weight surfactants and high molecular weight surfactants, the polymer contained in the latex The process of reacting isoprene with carboxyl-containing compounds.

[0057] According to the present invention, when polyisoprene contained in polyisoprene latex is reacted with a carboxyl group-containing compound, the reaction is carried out in the presence of a low-molecular-weight surfactant and a...

Embodiment 1

[0170] Manufacture of Latex of Synthetic Polyisoprene

[0171]Synthetic polyisoprene with a weight-average molecular weight of 1,300,000 (trade name "NIPOLIR2200L", manufactured by Nippon Zeon Co., Ltd., homopolymer of isoprene, cis-bond unit content: 98%) was mixed with cyclohexane. While stirring, the temperature was raised to 60° C. to dissolve, and a cyclohexane solution (a) of polyisoprene having a viscosity of 12,000 mPa·s measured by a B-type viscometer (solid content concentration: 8% by weight) was prepared.

[0172] On the other hand, water was added to 20 parts of sodium rosinate, and the temperature was raised to 60° C. to dissolve, thereby preparing an anionic surfactant (b) having a concentration of 1.5% by weight.

[0173] Next, the above-mentioned cyclohexane solution (a) and the above-mentioned anionic surfactant aqueous solution (b) were mixed using a mixer (trade name "Multiline mixer MS26-MMR-5.5L) in a weight ratio of 1:1.5. ", manufactured by Satake Ch...

Embodiment 2

[0181] Instead of the high-molecular-weight surfactant (B-1), a special polycarboxylic acid-type high-molecular surfactant (trade name "DEMOL P", weight-average molecular weight: 12000, Kao Corporation), except that, it carried out similarly to Example 1, the manufacture of the modified polymer latex was performed, and it evaluated similarly. The results are shown in Table 1.

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Abstract

A production method of a modified polymer latex is provided which involves adding a carboxy group-containing compound, an anionic surfactant with a weight average molecular weight less than 500 and ananionic surfactant with a weight average molecular weight greater than or equal to 500 to a polyisoprene latex, and reacting the carboxy group-containing compound with the polyisoprene in the presence of the anionic surfactant with a weight average molecular weight less than 500 and the anionic surfactant with a weight average molecular weight greater than or equal to 500.

Description

technical field [0001] The present invention relates to a method for producing a modified polymer latex capable of effectively suppressing the generation of aggregates even when the solid content concentration is increased. Background technique [0002] Conventionally, it has been known that latex compositions containing natural rubber latex can be dip-molded to obtain dip-molded articles such as pacifiers, balloons, gloves, balloons, and bags that are used in contact with the human body. However, since natural rubber latex contains proteins that cause allergic symptoms in humans, it may be a problem as a dipped molded product that comes into direct contact with biological mucous membranes or organs. Therefore, studies are underway to remove proteins from natural rubber latex by purification or the like, or to use synthetic rubber latex instead of natural rubber. [0003] For example, Patent Document 1 discloses a latex of carboxyl-modified synthetic polyisoprene, which is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/02B29C41/14C08C19/28C08L51/04
CPCB29C41/14C08F279/02C08C19/34C08F2/22C08C19/36C08C19/28C08F36/08C08F136/08C08F220/06C08L51/04C08L2312/00
Inventor 相原俊仁
Owner ZEON CORP
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