Oligophosphazene compound
AssigneeFushimi Pharmaceutical Co., Ltd.
InventorToshiki FUSHIMI
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Abstract
The oligophosphazene compound capable of forming a polymer which can be used as an optical material is a cyclic or linear compound including constituent units represented by the general formula (I) below in a range from 3 to 14. In the general formula (I), k is an integer of 1 to 4 and X1 is one selected from the group consisting of an oxygen atom, a sulfur atom, an NH group and an NCH3 group. A polymer made of this oligophosphazene compound exhibits high transparency and a high refractive index and is also less likely to cause optical dispersion, and thus it can be used as an optical lens, a retardation film, a light transmission body and other optical moldings.
Claims14
An oligophosphazene compound, comprising at least one sulfur-containing ring containing a phosphorus atom of a phosphazene skeleton as a constituent atom, wherein
- the sulfur-containing ring is comprised of a residue of a difunctional alkylthiol compound having a thiol group and a group selected from the group consisting of an amino group, a hydroxyl group and a mercapto group.
An oligophosphazene compound comprising a constituent unit U1 represented by the following general formula (I):
- in the general formula (I),
- k is an integer of 1 to 4, and
- X1 is one selected from the group consisting of an oxygen atom,
- a sulfur atom, an NH group and an NCH3 group.
A method for producing an oligophosphazene compound, comprising the step A of applying at least one of the following steps (a-1) and (a-2):
- step (a-1):
- the step of nucleophilically substituting halogen atoms of the phosphonitrile dihalide unit using at least one kind of compound among the group of difunctional alkylthiol compounds having a thiol group and a group selected from the group consisting of an amino group, a hydroxyl group and a mercapto group in the presence of a base capable of scavenging a hydrogen halide;
- and
- step (a-2):
- the step of nucleophilically substituting halogen atoms of the phosphonitrile dihalide unit using a metal salt of at least one kind of compound among the group of difunctional alkylthiol compounds having a thiol group and one group among the group of a hydroxyl group and a mercapto group,
- to a phosphazene compound including a phosphonitrile dihalide unit represented by the following general formula (IV):
- in the general formula (IV), X4 and X5 each represents a halogen atom.
A polymer obtained by thermally polymerizing an oligophosphazene compound, wherein
- the oligophosphazene compound comprises at least one sulfur-containing ring containing a phosphorus atom of a phosphazene skeleton as a constituent atom, and the sulfur-containing ring comprised of a residue of a difunctional alkylthiol compound having a group selected from the group consisting of an amino group, a hydroxyl group and a mercapto group.
Dependencies are inferred from the claim text.