Latex and resin compositions, and methods for producing the same.

Abstract

Provided is a latex that has low environmental impact, has excellent polymer microparticle dispersibility, enables efficient recovery of polymer microparticles from latex, and is useful in novel technologies. Specifically, the present invention provides a latex that contains specific amounts of: polymer microparticles (A) having a graft segment formed from a polymer containing specific structural units; and a resin (B) having a specific viscosity. The resin (B) coats the surface of the polymer microparticles (A).

Claims

1. A latex comprising polymer fine particles (A) and resin (B), The polymer fine particles (A) have a graft portion made of a polymer that includes a constituent unit derived from a (meth)acrylate monomer as a constituent unit. The resin (B) is a liquid having a viscosity of 100 mPa·s to 1,000,000 mPa·s at 25°C. The polymer fine particles (A) are coated on the surface with the resin (B), The volume-average particle size of the polymer fine particles (A) coated on the resin (B) is 1.030X μm to 4.000X μm. The above X is the volume-average particle diameter of the polymer fine particles (A) before they are coated with the resin (B). When the total of the polymer fine particles (A) and the resin (B) is 100% by weight, the polymer fine particles (A) make up 50 to 99% by weight and the resin (B) makes up 1 to 50% by weight. The resin (B) is a latex, which is one or more selected from the group consisting of epoxy resins, epoxidized oils and fats, and epoxidized fatty acid esters.

2. The latex according to claim 1, wherein the transmittance of solution V at 546 nm is 30% or more: Here, solution V is a solution obtained by the following operation; (1) Add a coagulant to the latex and mix the resulting mixture for 2 to 60 minutes; (2) The resulting mixture is separated into a coagulated substance and an aqueous component; (3) Add 1 g of the coagulated material to 30 g of deionized water, and shake the resulting mixture for 10 minutes to obtain solution V; Here, the amount of coagulant added in (1) is sufficient to ensure that the transmittance of the water component obtained in (2) at 546 nm is 30% or more.

3. A method for producing latex according to claim 1, A resin mixing step in which the latex precursor containing the polymer fine particles (A) is mixed with the resin (B), A method for producing latex, comprising a shearing step of applying shear stress to a mixture obtained by the resin mixing step.

4. Furthermore, the process includes a separation step to separate the mixture obtained by the shearing step into a coagulated material and the latex. The method for producing latex according to claim 3, wherein the shearing step includes a step of applying shear stress to the mixture obtained in the resin mixing step so as to satisfy the following formula (formula 1): Y≦32...(Formula 1) The aforementioned Y is obtained by the following (Equation 2): Y = [{Total content of polymer particles (A) and resin (B) in the latex} / {Weight of the latex}] × 100 ... (Equation 2).

5. The method for producing latex according to claim 3 or 4, wherein the resin mixing step includes a step of mixing 1 to 70% by weight of the polymer fine particles (A) and 30 to 99% by weight of the resin (B), when the total amount of the polymer fine particles (A) and the resin (B) is 100% by weight.

6. The method for producing latex according to any one of claims 3 to 5, wherein the temperature of the mixture obtained by the shearing step is 70°C or lower.

7. The latex according to claim 1 or 2, wherein the polymer fine particles (A) further comprises an elastic body containing a diene rubber.

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