Title:
INJECTION MOLDING METHOD AND OPTICAL COMPONENT
Document Type and Number:
Japanese Patent JP3875326
Kind Code:
B
Abstract:
PROBLEM TO BE SOLVED: To stably produce a molding having excellent transferability of a fine convexo-concave shape without external appearance fault or deformation without lowering original physical properties of transparent resin by fully filling carbon dioxide in a mold cavity at a specific pressure.
SOLUTION: Pressure of carbon dioxide is 10MPa or less, and particularly preferably 1 to 10MPa. Its purity is preferably 95% or more. Fine convexo- concave shape to be executed on a surface of a mold is not particularly limited, but its constituent unit includes a prismatic shape or satin state. In the case of the prismatic shape, a ratio b/a of height (a) of the shape to arranging pitch (b) is 0.2 to 500, and particularly 1 to 50 is preferable. In the case of the satin state, maximum height of surface roughness is 1 to 100μm or particularly preferably 1 to 50μm. The transparent resin is not particularly limited, but methacrylic resin is particularly preferably adopted. The higher a mold temperature is, the more effective the transfer effect is with lower carbon dioxide pressure. Its range is preferably 60 to 100°C.
Inventors:
Hoshina, Shuji
Hosonuma, Nobuyuki
Hosonuma, Nobuyuki
Application Number:
JP1996000298355
Publication Date:
November 02, 2006
Filing Date:
November 11, 1996
Export Citation:
Assignee:
ASAHI CHEM IND CO LTD
International Classes:
B29C45/00; B29C45/17; B29C45/37; B29K33/00; B29K69/00; B29K105/32; B29L11/00; (IPC1-7): B29C45/00; B29C45/37; //B29K33:00; B29K105:32; B29L11:00
Previous Patent: STEEL SHEET COATING METHOD
Next Patent: TWO STAGE TYPE ELECTRIC HYDRAULIC PRESSURE CONTROL VALVE
Next Patent: TWO STAGE TYPE ELECTRIC HYDRAULIC PRESSURE CONTROL VALVE