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
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[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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