Porous poly(vinyl acetal) resin body having a high degree of cleanliness, a process of preparing the same, and a method of storing the same
First Claim
1. A method of storing a porous poly(vinyl acetal) resin body prepared with a high degree of cleanliness, the method comprises a step of hermetically packaging the porous resin body in a wet state with an oxygen barrier film, wherein the porous resin body has a Chemical Oxygen Demand (COD) of 5 ppm or less, a sodium ion concetration of 1 ppm or less, a conductivity of less than 5 μ
- S/cm, and a maximum number of particles having a size of 2.5 μ
m or larger at 50,000/cc of the porous body.
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Abstract
A process of preparing and a method of storing porous poly (vinyl acetal) resin body. A method of storing the porous body involves keeping the porous body wet and free of contamination with organic substances, dissolved ions, and other fine particles. The storing method also involves keeping the body free of mold and avoiding pre-cleaning after a prolonged period of storage.
15 Citations
12 Claims
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1. A method of storing a porous poly(vinyl acetal) resin body prepared with a high degree of cleanliness, the method comprises a step of hermetically packaging the porous resin body in a wet state with an oxygen barrier film, wherein the porous resin body has a Chemical Oxygen Demand (COD) of 5 ppm or less, a sodium ion concetration of 1 ppm or less, a conductivity of less than 5 μ
- S/cm, and a maximum number of particles having a size of 2.5 μ
m or larger at 50,000/cc of the porous body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- S/cm, and a maximum number of particles having a size of 2.5 μ
-
9. A method of storing a porous poly(vinyl acetal) resin body having a high degree of cleanliness, the method comprises steps of hermetically packaging the porous poly(vinyl acetal) resin body in a wet state, wherein the porous resin body has a Chemical Oxygen Demand (COD) of 5 ppm or less, a sodium ion concentration of 1 ppm or less, a conductivity of less than 5 μ
- S/cm, and a maximum number of particles having a size of 2.5 μ
m or larger at 50,000/cc of the porous resin body, and irradiating the hermetic package containing the porous resin body with an electron beam or γ
-ray. - View Dependent Claims (10, 11, 12)
- S/cm, and a maximum number of particles having a size of 2.5 μ
Specification