Impact resistant Fresnel lens
AssigneesSumitomo Chemical Company, Limited, Dai Nippon Printing Co., Ltd.
InventorsKazuhiro Yokoo, Satoshi Honda, Hideaki Matsuura
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Abstract
The present invention provides an impact resistant Fresnel lens comprising a resin which is obtained by polymerizing a solution consisting essentially of (a) 100 parts by weight of a monomer mixture comprising an styrenic monomer in an amount of from 60 to 99 parts by weight and a (meth)acrylic monomer of from 1 to 40 parts by weight, and (b) 1 to 50 parts by weight of a styrene-dienic copolymer based on 100 parts by weight of said monomer mixture based on 100 parts by weight of said monomer mixture. The Fresnel lens has a high refractive index and excellent transparency and impact resistance.
Claims21
An impact resistant Fresnel lens consisting essentially of a resin which is obtained by polymerizing a solution consisting essentially of:
- (a) 100 parts by weight of a monomer mixture comprising a styrenic monomer in an amount of from 60 to 99 parts by weight and a (meth)acrylic monomer of from 1 to 40 parts by weight, and
- (b) 1 to 50 parts by weight of a styrene-dienic copolymer based on 100 parts by weight of said monomer mixture.
A method for preparing an impact resistant Fresnel lens comprising:
- (1) forming a resin by polymerizing a solution consisting essentially of:
- (a) 100 parts by weight of a monomer mixture comprising a styrenic monomer in an amount of from 60 to 99 parts by weight, and a (meth)acrylic monomer in an amount of from 1 to 40 parts by weight;
- and
- (b) 1 to 50 parts by weight of a styrene-dienic copolymer based on 100 parts by weight of said monomer mixture;
- and
- (2) shaping said resin into the shape of a Fresnel lens.
An impact resistant Fresnel lens consisting essentially of a resin which is obtained by polymerizing a solution consisting essentially of:
- (a) 100 parts by weight of a monomer mixture comprising a styrenic monomer in an amount of from 60 to 99 parts by weight and a (meth)acrylic monomer of from 1 to 40 parts by weight, and
- (b) 1 to 50 parts by weight of a styrene-dienic copolymer based on 100 parts by weight of said monomer mixture, wherein said Fresnel lens has a shaped surface which exhibits significant refractive properties, and wherein the resin has a refractive index of from 1.54 to 1.65.
Dependencies are inferred from the claim text.