Diacetylene film sensitized with photoinitiator and applications of the film

Patent metadata

Field	Value
Publication number	US-2016290859-A1
Application number	US-201414777602-A
Country	US
Kind code	A1
Filing date	Mar 7, 2014
Priority date	Mar 21, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A process for improving sensitivity of a film base, coated with a dispersion of a normally crystalline polyacetylenic compound in a non-solvating liquid which is dried on the film surface, to particular photon energy band, specifically, long wavelength UV; the polyacetylenic compound preferably having at least two conjugated acetylenic linkages and containing from 12 to 60 carbon atoms. The sensitization of the film to long wavelength UV is achieved via the addition of photoinitiator(s) capable of absorbing UV energy and converting it to free radicals.

First claim

We claim:

1 . A film media sensitive to long wavelength UV comprising a first support layer of polymeric film which is permeable to said UV and a second layer prepared from a radiochromic active fluid comprising a microcrystalline dispersion of a substantially crystalline image receptive polyacetylenic compound and a photoinitiator compound or mixture of photoinitiators.

2 . The film media of claim 1 , wherein the polyacetylenic compound has the following structure:
A-(CH 2 ) n —C≡C—C≡C—(CH 2 )m-B:

wherein m and n are both independently an integer from 6 to 14 and A and B are independent from one another and are selected from the group consisting of methyl, carboxyl, hydroxy, amido, lower alkyl substituted amido, aliphatic or aromatic carboxylate ester group having up to 10 carbon atoms, mono- or di-valent carboxylate metal salt group, halo, carbamyl, lower alkyl substituted carbamyl or tosyl, triyn or tetrayne products of the above polyacetylenes having from 20 to 60 carbon atoms and a conjugated structure, and combinations thereof.

3 . The film media of claim 1 , wherein the photoinitiator compound is present in an amount from about 0.01 to 10.0% by weight of the radiochromic active fluid.

4 . The film media of claim 1 , wherein the long wavelength UV has wavelength in the range between 280 to 400 nm.

5 . The film media of claim 1 , wherein the photoinitiator is present in an amount from about 0.05 to 1.0% by weight of the radiochromic active fluid.

6 . The film media of claim 1 , wherein the photoinitiator is selected from benzoin, benzil derivative, ketal derivatives, alkyl phenones acylphosphine oxide, halogenated methyl ketones, thioxanthone and/or xanthone.

7 . The film media of claim 1 , which can be further converted into an indicator that undergoes distinct visual change upon exposure to long wavelength UV.

8 . The indicator of claim 7 used as visual verification of exposure in any process involving the use of long wavelength UV as the radiation source.

9 . The indicator of claim 7 used as visual verification of exposure in a blood pathogen inactivation system which uses long wavelength UV.

10 . The film media of claim 1 used to quantify radiation exposure to long wavelength UV.

11 . A UV radiation dosimeter comprising the film media of claim 1 .

Assignees

• Isp Investments Inc

Inventors

• Yu Xiang
• Shih Hsiao-Yi
• Fairhurst David Lewis

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• C08J2449/00

  Characterised by the use of homopolymers or copolymers of compounds having one or more carbon-to-carbon triple bonds; Derivatives of such polymers · CPC title

• C08J2367/00

  Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers · CPC title

• G01N33/49

  Blood {(chemical methods for determining blood cell populations G01N33/5094; chemical analysis of blood groups or blood types G01N33/80)} · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title