High transparency silica-titania glass beads, method for making,

Details High transparency silica-titania glass beads, method for making, High transparency silica-titania glass beads, method for making,

1991-02-07

1992-12-29

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523214, 523219, C08K 340, C08L 6300

Patent

active

051751992

ABSTRACT:
High transparency silica-titania glass beads are characterized by a linear transmittance of at least 70% as measured at a wavelength of 900 nm to 600 nm by a specific measurement method. Such beads are prepared by hydrolyzing and polycondensing a silicon alkoxide and a titanium alkoxide to form a silica-titania sol, converting the sol into a dry gel, and then grinding the gel followed by heating or heating the gel followed by grinding. A light transmisson epoxy resin composition comprising a curable epoxy resin, a curing agent, and the high tranparency silica-titania glass beads has crack resistance and high transparency in cured state. It is useful in encapsulating optical semiconductor devices.

REFERENCES:
patent: 3171827 (1965-03-01), de Vries
patent: 4842837 (1989-06-01), Shimizu et al.
patent: 4985751 (1991-01-01), Shiobara et al.
Chem. Abstracts, vol. 112, No. 18, Abstract No. 163830r (Apr. 1990).
Patent Abstract of Japan, vol. 14, No. 330 (C-741) (4273). (Jul. 16, 1990).
Best, M. F.; Condrate, R. A. Sr.; "A Raman Study of TiO.sub.2 -SiO.sub.2 Glasses Prepared by Sol-Gel Processes"; Journal of Materials Science Letters, 4, 1985, 994-998.

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