Method of manufacturing plastic lens, method of positioning film, and composite body

Patent metadata

Field	Value
Publication number	US-10899094-B2
Application number	US-201615557687-A
Country	US
Kind code	B2
Filing date	Jan 14, 2016
Priority date	Mar 12, 2015
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

A method of manufacturing a plastic lens includes: a step of putting a first curable composition over a forming surface of a first mold substrate having the forming surface for forming a lens surface; a step of spreading the first curable composition over the entire forming surface by pressing the composition with a film to form a first curable composition layer and separating the film from the first mold substrate by a predetermined distance through the formed first curable composition layer; a step of covering defined surfaces; a step of injecting a second curable composition into a defined location; a step of curing the first curable composition layer and the injected second curable composition; and a step of removing to obtain a plastic lens.

First claim

The invention claimed is:

1. A method of manufacturing a plastic eyeglass lens, comprising:
a step of putting a first curable composition over a forming surface of a first mold substrate having the forming surface for forming a lens surface;
a step of spreading the first curable composition over the entire forming surface by pressing the first curable composition with a film to form a first curable composition layer and separating the film from the first mold substrate by a predetermined distance through the formed first curable composition layer;
a step of covering an outer edge of the first mold substrate, an outer edge of the film, and an outer edge of a second mold substrate having a forming surface for forming the other surface of the lens with a tape or a gasket to support them and to place the second mold substrate so as to be opposed to the film with being spaced apart from the film by a predetermined distance;
a step of semi-curing the first curable composition layer;
a step of injecting a second curable composition into a cavity between the film and the second mold substrate, wherein the second curable composition is injected into the cavity after the first curable composition is semi-cured and is injected when the first curable composition has formed a semi-cured layer;
a step of curing the semi-cured first curable composition layer and the injected second curable composition to form substrate layers over both sides of the film; and
a step of removing the tape or the gasket, the first mold substrate and the second mold substrate to obtain a plastic eyeglass lens.

2. The method of manufacturing a plastic eyeglass lens according to claim 1 ,
wherein the step of semi-curing the first curable composition layer is a step of semi-curing the first curable composition layer such that the position of the film does not move at a position spaced apart from the forming surface of the first mold substrate by 0.1 mm to 3.0 mm.

3. The method of manufacturing a plastic eyeglass lens according to claim 1 ,
wherein a storage elastic modulus of the semi-cured first curable composition at 20° C. is 0.01 Pa to 100,000 Pa.

4. The method of manufacturing a plastic eyeglass lens according to claim 1 ,
wherein a storage elastic modulus of the semi-cured first curable composition at 20° C. is 0.1 Pa to 1,000 Pa.

5. The method of manufacturing a plastic eyeglass lens according to claim 1 ,
wherein the first curable composition is a (thio)urethane material, and the polymerization degree of the semi-cured first curable composition is 30% to 70%.

6. The method of manufacturing a plastic eyeglass lens according to claim 1 ,
wherein, in the step of putting the first curable composition, the viscosity of the first curable composition at 20° C., measured by a B type viscometer, is 1 mPa·s to 500 mPa·s.

7. The method of manufacturing a plastic eyeglass lens according to claim 1 , further comprising:
a step of putting a spacer for positioning the film over the forming surface of the first mold substrate before or after the step of putting the first curable composition over the forming surface of the first mold substrate.

8. The method of manufacturing a plastic eyeglass lens according to claim 7 ,
wherein the spacer has a ring shape, and is placed along an outer peripheral edge over the forming surface of the first mold substrate.

9. The method of manufacturing a plastic eyeglass lens according to claim 1 ,
wherein the film is a shaped polarizing film.

10. The method of manufacturing a plastic eyeglass lens according to claim 9 ,
wherein the polarizing film is a polyvinyl alcohol film or a thermoplastic polyester film.

11. A method of manufacturing a plastic eyeglass lens, comprising:
a step of putting a first curable composition having a viscosity of 2,000 mPa·s to 80,000 mPa·s over a forming surface of a first mold substrate having the forming surface for forming a lens surface;
a step of spreading the first curable composition over the entire forming surface by pressing the first curable composition with a film to form a first curable composition layer and separating the film from the first mold substrate by a predetermined distance through the formed first curable composition layer;
a step of covering an outer edge of the first mold substrate, an outer edge of the film, and an outer edge of a second mold substrate having a forming surface for forming the other surface of the lens with a fastening member to support them and to place the second mold substrate so as to be opposed to the film with being spaced apart from the film by a predetermined distance;
a step of injecting a second curable composition into a cavity between the film and the second mold substrate;
a step of curing the first curable composition layer and the injected second curable composition to form substrate layers over both sides of the film; and
a step of removing the fastening member, the first mold substrate and the second mold substrate to obtain a plastic lens.

12. The method of manufacturing a plastic eyeglass lens according to claim 11 ,
wherein the fastening member is a tape or a gasket.

13. The method of manufacturing a plastic eyeglass lens according to claim 11 , further comprising:
a step of putting a spacer for positioning the film over the forming surface of the first mold substrate before or after the step of putting the first curable composition over the forming surface of the first mold substrate.

14. The method of manufacturing a plastic eyeglass lens according to claim 13 ,
wherein the spacer has a ring shape, and is placed along an outer peripheral edge over the forming surface of the first mold substrate.

15. The method of manufacturing a plastic eyeglass lens according to claim 11 ,
wherein the film is a shaped polarizing film.

16. The method of manufacturing a plastic eyeglass lens according to claim 15 ,
wherein the polarizing film is a polyvinyl alcohol film or a thermoplastic polyester film.

Assignees

• Hopnic Laboratory Co Ltd
• Mitsui Chemicals Inc

Inventors

• Aiiso Yoshimitsu

Classifications

• G02C7/12

  Polarisers · CPC title

• G02C7/02

  Lenses; Lens systems {; Methods of designing lenses} · CPC title

• G02B5/30

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• B32B37/02

  characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations · CPC title

• B29D11/00644 Primary

  polarizing · CPC title