US3899677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic for indicating a radiation dose
Assignee: Nitto Denko Corp
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Filing: 1973-11-29
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Granted: 1975-08-12
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Expires: 1993-11-29
Abstract
Abstract A plastic film suitable for indicating radiation dose contains a chlorine polymer, at least one acid sensitive coloring agent and a plasticizer. The film undergoes a distinct change of color in response to a given radiation dose, the degree of change proportional to the total change. These films may be stored for a long period without loss of sensitivity, and have good color stability after irradiation.
Inventors
- 👤 Yutaka Hori
- 👤 Nobuharu Yoshikawa
- 👤 Saburo Ohmori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:25
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/04; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016; C08K5/0041
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
218 words
A FILM COMPRISING A ATUBLE PLASTIC COMPOSITION COATED ON ONE SIDE OF A CARRIRE AND AN ADHESIVE LAYER COATED ON AT LEAST A PORTION OF THE OTHER SIDE OF SAID CARRIER, SAID STABLE PLASTICZ COMPOSITION INDICATING A RADIATION DOSE BY A DISTINCT CHANGE OR LOSS OF COLOR WHEN IRRADIATED WITH IONIZING RADIATION, SAID COMPOSITION CONSISTING ESSENTIALLY OF : A. A MOLDABLE CHLORINE-CONTAINING POLYMER HAVING A CHLORINE CONTENT OF FROM 30 TO 80 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE POLYMER, SAID POLYMER RELEASING HYDROGEN HLORIDE WHEN IRRADIATED WITH IONIZING RADIATION, B. FROM 0.1 TO 5 PARTS BY WEIGHT, BASED ON 100 PARTS BY WEIGHT OF SAID POLYMER, OF ANILINE BLUE AS AN ACID-SENSITIVE COLORING AGENT, AND, AT LEAST ONE OTHER ACID-SENSITIVE COLORING AGENT WHICH DISCOLORS OR LOSES COLOR, UPON IRRADIATION WITH IONIZING RADIATION BY THE ACTION OF THE HYDROGEN CHLORIDERELEASED FROM SAID POLYMER, AND C. FROM 5 TO 80 PARTS BY WEIGHT, BASED ON 100 PARTS BY WEIGHT OF SAID POLYMER, OF A PLASTICIZER WHICH DOES NOT REACT WITH ORINHIBIT THE FUNCTION OF THE HYDROGEN CHLORIDE RELEASED BY SAID POLYMER UPON IRRADIATION WITH IONIZING RADIATION AND WHICH HAS GOOD COLOR STABILITY AFTER IRRADIATION WITH INIZING RADIATION, SAID PLASTICIZER BEING SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID ESTERS, POLYESTERS, CHLORINATED PARAFFINS, AND TRIMELRITIC ESTERS, POLYALIPHATIC ALCOHOLS.
Claim 2
Dependent Claim
218 words
A FILM COMPRISING A ATUBLE PLASTIC COMPOSITION COATED ON ONE SIDE OF A CARRIRE AND AN ADHESIVE LAYER COATED ON AT LEAST A PORTION OF THE OTHER SIDE OF SAID CARRIER, SAID STABLE PLASTICZ COMPOSITION INDICATING A RADIATION DOSE BY A DISTINCT CHANGE OR LOSS OF COLOR WHEN IRRADIATED WITH IONIZING RADIATION, SAID COMPOSITION CONSISTING ESSENTIALLY OF : A. A MOLDABLE CHLORINE-CONTAINING POLYMER HAVING A CHLORINE CONTENT OF FROM 30 TO 80 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE POLYMER, SAID POLYMER RELEASING HYDROGEN HLORIDE WHEN IRRADIATED WITH IONIZING RADIATION, B. FROM 0.1 TO 5 PARTS BY WEIGHT, BASED ON 100 PARTS BY WEIGHT OF SAID POLYMER, OF ANILINE BLUE AS AN ACID-SENSITIVE COLORING AGENT, AND, AT LEAST ONE OTHER ACID-SENSITIVE COLORING AGENT WHICH DISCOLORS OR LOSES COLOR, UPON IRRADIATION WITH IONIZING RADIATION BY THE ACTION OF THE HYDROGEN CHLORIDERELEASED FROM SAID POLYMER, AND C. FROM 5 TO 80 PARTS BY WEIGHT, BASED ON 100 PARTS BY WEIGHT OF SAID POLYMER, OF A PLASTICIZER WHICH DOES NOT REACT WITH ORINHIBIT THE FUNCTION OF THE HYDROGEN CHLORIDE RELEASED BY SAID POLYMER UPON IRRADIATION WITH IONIZING RADIATION AND WHICH HAS GOOD COLOR STABILITY AFTER IRRADIATION WITH INIZING RADIATION, SAID PLASTICIZER BEING SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID ESTERS, POLYESTERS, CHLORINATED PARAFFINS, AND TRIMELRITIC ESTERS, POLYALIPHATIC ALCOHOLS.
Claim 3
Dependent Claim
14 words
The film of claim 1, wherein the adhesive layer contains an opaque coloring agent.
Claim 4
Dependent Claim
31 words
The film of claim 1, wherein the chlorine-containing polymer is selected from the group consisting of polyvinyl chloride, vinyl chloride/vinyl acetate copolymers, polyvinylidene chloride, vinyl chloride/acrylic acid copolymers and chlorinated polyethylene.
Claim 5
Dependent Claim
39 words
The film of claim 3, wherein the amount of vinyl chloride in said vinyl chloride/vinyl acetate copolymers and in said vinyl chloride/acrylic acid copolymers is from 76 to 97 percent by weight based on the weight of the copolymer.
Claim 6
Dependent Claim
35 words
The film of claim 1, wherein component (b) is a combination of 0.6 part by weight of aniline blue, 0.3 part by weight of aniline yellow, and 0.3 part by weight of benzene azo diphenylamine.
Claim 7
Dependent Claim
35 words
The film of claim 1, wherein component (b) is a combination of 0.6 part by weight of aniline blue, 0.3 part by weight of methyl yellow, and 0.3 part by weight of benzene azo diphenylamine.
Claim 8
Dependent Claim
26 words
The film of claim 1, wherein the chlorine content of the chlorine-containing polymer ranges from 50-70 percent by weight, based on the weight of said polymer.
Claim 9
Dependent Claim
32 words
The film of claim 1, wherein the total acid sensitive coloring agent is present in an amount of 1.0-1.5 parts by weight, based on 100 parts by weight of said chlorine-containing polymer.
Claim 10
Dependent Claim
29 words
The film of claim 1, wherein the plasticizer is present in an amount of from 20-50 parts by weight, based on 100 parts by weight of said chlorine-containing polymer.
Claim 11
Dependent Claim
19 words
The film of claim 1, wherein the degree of polymerization of the chlorine-containing polymer ranges from 350 to 1300.
Claim 12
Dependent Claim
15 words
The film of claim 10, wherein the degree of polymerization ranges from 500 to 1000.
Claim 13
Dependent Claim
21 words
The film of claim 1, wherein said phosphoric acid esters comprise the phosphoric acid esters of aliphatic alcohols, phenols or cresols.
Claim 14
Dependent Claim
24 words
The film of claim 1, wherein said polyester is the adipic acid ester of ethylene glycol or the sebacic acid ester of ethylene glycol.
Claim 15
Dependent Claim
25 words
The film of claim 1, wherein said chlorinated paraffin contains from 30 to 80 weight percent chlorine based on the weight of the chlorinated paraffin.
Claim 16
Dependent Claim
25 words
The film of claim 1, wherein said trimellitic ester is the trimellitic acid ester of an aliphatic alcohol having from 5 to 20 carbon atoms.
Claim 17
Dependent Claim
47 words
The film of claim 1, wherein said component (b) is a combination of aniline blue and another acid-sensitive coloring agent selected from the group consisting of aniline yellow, benzene azo diphenylamine, methyl yellow, diethyl yellow, meta-methyl red, methyl violet, gentiana violet, crystal violet, congo red and quinoline.
Claim 18
Dependent Claim
27 words
The film of claim 1, wherein said carrier comprises a material selected from the group consisting of aluminum foil, polyester film, polypropylene film and fluorine resin film.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |