Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in tubular or loop reactor
Patent
1996-09-05
1999-01-26
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in tubular or loop reactor
526259, 526264, 526291, 5263031, 526319, 526328, 526346, C08F 2606
Patent
active
058639934
ABSTRACT:
A preparation method of polymerid rod using free radical bulk polymerization with temperature gradient, comprising the steps of, charging a mixture of monomer which can be subjected to a radical polymerization, polymerization initiator and cross linking agent into a reaction container of tube shape having a constant inner diameter and performing radical polymerization of the monomer, by passing the said reaction container in a constant dipping speed through a zone downwardly from upper part to lower part of the said zone, wherein the upper part of the zone is maintained at a relatively low temperature (TL) and the lower part of the zone is maintained at a relatively high temperature (TH) than that of the said upper part so that the medium part located between the upper part and lower part has a temperature gradient of (TH-TL)/L (wherein, L is defined as a vertical distance of the temperature-gradient zone). By the present method, it is possible to decrease a transmission loss of the obtained polymeric rod due to scattering. The obtained polymeric rod by the present method having nearly perfect outer shape can be used in preparing a polymeric gradient-index rod lens which is used as an optical component.
REFERENCES:
Koike et al. "Plastic axial gradient-index lens", Applied Optics, Vol. 24, No. 24. Dec. 1986.
"Light-focusing plastic rod prepared by photocopolymerization of methacrylic esters with vinyl benzoates" by Y. Ohtsuka et al, Applied Physics Letters, vol.29, No. 9, 1 Nov. 1976.
"Plastic axial gradient-index lens" by Koike et al; Applied Optics, 15 Dec. 1986, vol.24, No. 24.
Electronics and Telecommunications Research Institute
Wu David W.
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