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US 10,473,888 B2Granted
Cycloolefin resin composition, molded article thereof, and mirror
AssigneeCanon Kabushiki Kaisha
InventorsKatsumoto Hosokawa, Takahiro Kojima
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Abstract
The present invention relates to a cycloolefin resin composition, a molded article of the cycloolefin resin composition, and an optical element, and in particular, to a resin composition containing inorganic particles in a resin, a molded article of the resin composition, and an optical element formed of the molded article.
Claims8
A method of producing a molded article comprising:
- preparing a cycloolefin resin composition that has a silica particle content of 15% by weight to 70% by weight by mixing a cycloolefin resin and silica particles that have an average primary particle size of 10 nm to 150 nm;
- wherein the silica particles are treated with hexamethyldisilazane;
- and
- forming the molded article by injection molding or heat press molding of the cycloolefin resin composition at a resin temperature of 200 degrees (Celsius) to 285 degrees (Celsius) and a holding pressure of 50 MPa or more,
- wherein the molded article has a linear expansion coefficient of 50×10-6/degrees (Celsius) or less in a temperature range of 0 degrees (Celsius) to 80 degrees (Celsius).
2 more elements
A method of forming a mirror comprising:
- preparing a cycloolefin resin composition that has a silica particle content of 15% by weight to 70% by weight by mixing a cycloolefin resin and silica particles that have an average primary particle size of 10 nm to 150 nm;
- wherein silica particles are treated with hexamethyldisilazane;
- forming a molded article that has a molded article surface with a surface roughness of an average root-mean-square surface roughness (Rq) of 10 nm or less by injection molding or heat press molding of the cycloolefin resin composition at a resin temperature of 200 degrees (Celsius) to 285 degrees (Celsius) and a holding pressure of 50 MPa or more;
- and
- forming a reflective layer for forming the mirror by providing the reflective layer on the molded article surface of the molded article,
- wherein the molded article has a linear expansion coefficient of 50×10-6/degrees (Celsius) or less in a temperature range of 0 degrees (Celsius) to 80 degrees (Celsius).
3 more elements
Dependencies are inferred from the claim text.