Method for stirring resin pellets

Patent metadata

Field	Value
Publication number	US-10130923-B2
Application number	US-201515525755-A
Country	US
Kind code	B2
Filing date	Nov 13, 2015
Priority date	Nov 14, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

A method for stirring resin pellets, which includes stirring adhesive resin pellets in a liquid in a stirring tank equipped with a stirring impeller, under the condition satisfying the following relational expression (I):
ρ ⁢ ⁢ ( Np 1 / 3 ⁢ nD ) 2 Δ ⁢ ⁢ pgdp ≧ 10 ( I )
wherein ρ is the density of the liquid (kg/m 3 ), Np is the power number of the stirring impeller, n is the rotational speed (1/s), D is the diameter of the stirring impeller (m), Δρ is the difference in density between the resin pellets and the liquid (kg/m 3 ), g is the gravitational acceleration (m/s 2 ), and dp is the particle diameter of the resin pellets (m).

First claim

The invention claimed is:

1. A method for stirring resin pellets, which comprises stirring adhesive resin pellets in a liquid in a stirring tank equipped with a stirring impeller, under the condition satisfying the following relational expression (I):

ρ
⁢

⁢

(

Np

1
/
3

⁢
nD

)

2

Δ
⁢

⁢
pgdp

≧
10

(
I
)

wherein ρ represents the density of the liquid (kg/m 3 ), Np represents the power number of the stirring impeller, n represents the rotational speed (1/s), D represents the diameter of the stirring impeller (m), Δρ represents the difference in density between the resin pellets and the liquid (kg/m 3 ), g represents the gravitational acceleration (m/s 2 ), and dp represents the particle diameter of the resin pellets (m).

2. The method for stirring resin pellets according to claim 1 , wherein
the tensile modulus of elasticity of the adhesive resin pellets is from 1 to 200 MPa according to JIS K 7113, and
the melt flow rate (MFR) of the adhesive resin pellets is from 1 to 10,000 g/10 min according to JIS K7210 under the condition of a temperature of 230° C. and a weight of 21.18N.

3. The method for stirring resin pellets according to claim 1 , wherein a ratio by mass of the resin pellets to the liquid (resin pellets/liquid) is within a range of 2/100 to 25/100.

4. The method for stirring resin pellets according to claim 1 , wherein the temperature of the liquid is 50° C. or lower.

5. The method for stirring resin pellets according to claim 1 , wherein the stirring impeller is a stirring impeller to generate an axial flow and a diagonal flow.

6. The method for stirring resin pellets according to claim 5 , wherein the axial flow and the diagonal flow to be generated by the stirring impeller are upward flows.

7. The method for stirring resin pellets according to claim 1 , wherein a ratio of the distance from the liquid surface in the stirring tank to the stirring impeller (h s1 ) to the diameter of the stirring impeller (D), h s1 /D is within a range of 0 or more and 0.6 or less.

8. The method for stirring resin pellets according to claim 1 , wherein a ratio of the diameter of the stirring impeller (D) to the inner diameter of the stirring tank (T), D/T satisfies 0.2 ≤D/T ≤0.6.

Assignees

• Idemitsu Kosan Co

Inventors

• Aida Masao
• Yamasaki Hokuto
• Yokota Tatsuyoshi
• Sato Yoshinori

Classifications

• B01F2215/0431

  Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof · CPC title

• B01F2215/0427

  Numerical distance values, e.g. separation, position · CPC title

• B01F2215/0409

  Relationships between different variables defining features or parameters of the apparatus or process · CPC title

• C08J2353/00

  Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers · CPC title

• C08J3/12 Primary

  Powdering or granulating · CPC title