US 2003/0144452 A1 · High index and high impact resistant polythiourethane/urea material, method of manufacturing same and its use in the optical field

Abstract

A transparent, non elastomeric, high index, impact resistant polythiourethane/urea material comprising the reaction product of: a) at least one (α, ω)-diiso(thio)cyanate cycloaliphatic or aromatic prepolymer having a number average molecular weight ranging from 100 to 3000 gmol−1, and b) at least one primary diamine, in an equivalent molar ratio amine function/iso(thio)cyanate function from 0.5 to 2, preferably from 0.90 to 1.10, wherein, said prepolymer and diamine are free from disulfide (—S—S—) linkage and at least one of the prepolymer or the diamine contains one or more S atoms in its chain.

Claims21

Dependent claims

A transparent, non-elastomeric, high index, impact resistant polythiourethane/urea material comprising the reaction product of:

a) at least one (α, ω)-diiso(thio)cyanate prepolymer having a number average molecular weight ranging from 100 to 3000 gmol−1, said prepolymer being free from disulfide (—S—S—) linkage, and
b) at least one aromatic primary diamine, in an equivalent molar ratio amine function/iso(thio)cyanate function (NH2/NCX, X=O, S) ranging from 0.5 to 2, preferably 0.90 to 1.10, said aromatic primary diamine being free from disulfide (—S—S—) linkage, and
wherein, at least one of the prepolymer or the diamine contains one or more S atoms in its chain.

Dependencies are inferred from the claim text.

Facts

Application

09/992,054Filed 14 Nov 2001

Published

31 Jul 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

C08G 18/5072
Having heteroatoms other than oxygen: containing sulfur
C08G 18/10
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
G02B 1/04
Optical elements characterised by the material of which they are made; Optical coatings for optical elements: made of organic materials, e.g. plastics
G02B 1/041
Made of organic materials, e.g. plastics: lenses

High index and high impact resistant polythiourethane/urea material, method of manufacturing same and its use in the optical field

Life of this patent

High index and high impact resistant polythiourethane/urea material, method of manufacturing same and its use in the optical field

Life of this patent

Abstract

Claims21