US 12,420,503 B2
Late-stage catalysis of fast room-temperature polymerizations
Aref Jallouli, Charenton-le-Pont (FR)
Assigned to Essilor International, Charenton-le-Pont (FR)
Appl. No. 18/841,134
Filed by ESSILOR INTERNATIONAL, Charenton-le-Pont (FR)
PCT Filed Mar. 29, 2023, PCT No. PCT/EP2023/058111
§ 371(c)(1), (2) Date Aug. 23, 2024,
PCT Pub. No. WO2023/186966, PCT Pub. Date Oct. 5, 2023.
Claims priority of application No. 22165819 (EP), filed on Mar. 31, 2022.
Prior Publication US 2025/0108574 A1, Apr. 3, 2025
Int. Cl. B29D 11/00 (2006.01); B29C 33/56 (2006.01); B29C 39/00 (2006.01); B29C 39/02 (2006.01); B29K 75/00 (2006.01); B29K 105/00 (2006.01)
CPC B29D 11/00442 (2013.01) [B29C 33/56 (2013.01); B29C 39/006 (2013.01); B29C 39/021 (2013.01); B29K 2075/00 (2013.01); B29K 2105/0002 (2013.01); B29K 2105/0014 (2013.01); B29K 2105/0094 (2013.01)] 14 Claims
 
1. A method of curing a transparent casted substrate, comprising:
providing a room-temperature polymerizable composition;
providing a catalyst composition;
providing a casting mold assembly containing two unsealed molds each having an inside surface and an outside surface; and optionally providing a light filtering element placed or configured to be placed between the two molds;
depositing the catalyst composition:
on the inside surface of at least one of the molds; and/or
on at least one surface of the light filtering element which is thereafter positioned in the mold assembly;
closing the casting mold assembly so that the inside surfaces of the molds form together the molding cavity;
filling the room-temperature polymerizable composition in the molding cavity of the casting mold assembly already containing the catalyst composition deposited on the inside surface of at least one of the molds;
curing the filled mold assembly to obtain a transparent solid substrate, said curing step comprising:
a) a first step for polymerizing said composition at room temperature to obtain a gel; and
b) a second step of post-curing the gel to obtain the transparent solid substrate; and
recovering the transparent solid substrate from the casting mold assembly,
wherein upon contact with the polymerizable composition, the catalyst composition initiates polymerization of the polymerizable composition.