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1. (EP1301550) METHOD FOR PREPARING A PHOTOCHROMIC POLYURETHANE LATEX AND APPLICATION TO OPHTHALMIC OPTICS

Office : European Patent Office
Application Number: 01956517 Application Date: 06.07.2001
Publication Number: 1301550 Publication Date: 16.04.2003
Publication Kind : B1
Prior PCT appl.: Application Number:EP2001007771 ; Publication Number: Click to see the data
IPC:
C08G 18/08
G02C 7/02
C08G 18/00
C08G 18/12
C08G 18/42
C08G 18/66
C08K 5/3437
C08K 5/357
G02B 1/10
G02B 5/23
G02C 7/10
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
18
Polymeric products of isocyanates or isothiocyanates
06
with compounds having active hydrogen
08
Processes
G PHYSICS
02
OPTICS
C
SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
7
Optical parts
02
Lenses; Lens systems
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
18
Polymeric products of isocyanates or isothiocyanates
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
18
Polymeric products of isocyanates or isothiocyanates
06
with compounds having active hydrogen
08
Processes
10
Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
12
using two or more compounds having active hydrogen in the first polymerisation step
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
18
Polymeric products of isocyanates or isothiocyanates
06
with compounds having active hydrogen
28
characterised by the compounds used containing active hydrogen
40
High-molecular-weight compounds
42
Polycondensates having carboxylic or carbonic ester groups in the main chain
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
18
Polymeric products of isocyanates or isothiocyanates
06
with compounds having active hydrogen
28
characterised by the compounds used containing active hydrogen
65
Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
66
Compounds of groups C08G18/42, C08G18/48, or C08G18/52111
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
K
USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
5
Use of organic ingredients
16
Nitrogen-containing compounds
34
Heterocyclic compounds having nitrogen in the ring
3412
having one nitrogen atom in the ring
3432
Six-membered rings
3437
condensed with carbocyclic rings
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
K
USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
5
Use of organic ingredients
16
Nitrogen-containing compounds
34
Heterocyclic compounds having nitrogen in the ring
35
having also oxygen in the ring
357
Six-membered rings
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
1
Optical elements characterised by the material of which they are made; Optical coatings for optical elements
10
Optical coatings produced by application to, or surface treatment of, optical elements
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5
Optical elements other than lenses
20
Filters
22
Absorbing filters
23
Photochromic filters
G PHYSICS
02
OPTICS
C
SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
7
Optical parts
10
Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
CPC:
C08K 5/3437
C08G 18/0823
C08G 18/12
C08G 18/4277
C08G 18/6659
C08K 5/357
G02B 5/23
Applicants: ESSILOR INT
Inventors: VASSAL NATHALY
VAIRON JEAN-PIERRE
CHARLEUX BERNADETTE
TARDIEU PASCALE
MAISONNIER SYLVETTE
CANO JEAN-PAUL
Priority Data: 0107771 06.07.2001 EP
0008937 07.07.2000 FR
Title: (DE) VERFAHREN ZUR HERSTELLUNG EINES PHOTOCHROMEN POLYURETHAN-LATEX UND ANWENDUNG IN DER AUGENOPTIK
(EN) METHOD FOR PREPARING A PHOTOCHROMIC POLYURETHANE LATEX AND APPLICATION TO OPHTHALMIC OPTICS
(FR) PROCEDE DE PREPARATION DE LATEX DE POLYURETHANNE PHOTOCHROMIQUE ET SON APPLICATION DANS L'OPTIQUE OPHTALMIQUE
Abstract: front page image
(EN) The method of the invention comprises : a) forming a hydrophilic polyurethane prepolymer with isocyanate end groups, by the polyaddition reaction of at least one polyol and at least one diisocyanate in the presence of at least one internal emulsifying agent; b) mixing the polyurethane prepolymer with a photochromic agent; c) adding water or a mixture of water and solvent, under agitation, to the mixture of the polyurethane prepolymer and the photochromic agent, to form an emulsion; and d) adding at least one chain extension agent to the emulsion and performing a chain extension reaction to give the final photochromic polyurethane latex. Application to the production of ophthalmic articles having photochromic properties.
(FR) L'invention concerne un procédé qui consiste à: a) constituer un prépolymère de polyuréthanne hydrophile avec des fins de groupes isocyanate par la réaction de polyaddition d'au moins un polyol et d'au moins un diisocyanate, en présence d'au moins un agent émulsifiant interne; b) mélanger le prépolymère de polyuréthanne avec un agent photochromique; c) ajouter, en agitant, de l'eau ou un mélange d'eau et de solvant au mélange de prépolymère de polyuréthanne avec l'agent photochromique pour former une émulsion; et d) ajouter au moins un agent d'extension de chaîne à l'émulsion et provoquer une réaction d'extension de chaîne pour obtenir le latex de polyuréthanne photochromique final. L'invention concerne également l'application de ce procédé à la fabrication d'articles ophthalmiques ayant des propriétés photochromiques.