US3962175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzene phosphonous acid compounds, their production and use as stabilizers for organic materials
Assignee: Sandoz AG
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Filing: 1974-04-25
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Granted: 1976-06-08
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Expires: 1994-04-25
Abstract
Abstract The purpose of the invention are new benzene phosphonous acid compounds in which two to four benzene nuclei are bound together and which contain one to three phosphorus atoms. The new compounds are free acids, their salts with inorganic cations, their esters, thioesters or amides. The invention concerns also the manufacture of these benzene phosphonous acid compounds and their use for the stabilization of organic materials.
Inventors
- 👤 Kurt Hofer
- 👤 Guenther Tscheulin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:08
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/48; C07F9/4808; C07F9/4841; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5393; C09; C09K; C09K15/00; C09K15/04; C09K15/32; C09K15/322; C09K15/324
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
A method of stabilizing material against the effect of light, oxygen or heat which comprises incorporating in or applying to the surface of an organic material which is sensitive to said effect an effective amount of a stabilizing agent of the formula ##SPC14## wherein Y is oxygen or sulphur and n is 1 or 2, in free acid or salt form.
Claim 2
Independent Claim
61 words
A method of stabilizing material against the effect of light, oxygen or heat which comprises incorporating in or applying to the surface of an organic material which is sensitive to said effect an effective amount of a stabilizing agent of the formula ##SPC14## wherein Y is oxygen or sulphur and n is 1 or 2, in free acid or salt form.
Claim 3
Dependent Claim
16 words
A process according to claim 1, wherein any salt form is an inorganic cation containing salt.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein any salt form is a calcium, zinc, sodium, potassium, aluminium, barium or nickel salt.
Claim 5
Dependent Claim
9 words
The method of claim 1 wherein n is 1.
Claim 6
Dependent Claim
9 words
The method of claim 1, wherein Y is oxygen.
Claim 7
Dependent Claim
14 words
The method of claim 1, wherein the stabilizing agent is of the formula ##SPC15##
Claim 8
Dependent Claim
13 words
The method of claim 1, wherein the susceptible material comprises a plastics material.
Claim 9
Dependent Claim
45 words
The method of claim 7, wherein the plastics material is selected from cellulose acetate, cellulose propionate, cellulose acetobutyrate, polyethylene, polypropylene, polyvinyl chloride, polyvinyl chloride-acetate, polyamides, polystyrene, ethyl cellulose, cellulose nitrate, polyvinyl alcohol, silicon rubber, melamine-formaldehyde and urea-formaldehyde resins, allyl cast resins, polymethylmethacrylate, polyesters and polyacrylonitrile.
Claim 10
Dependent Claim
30 words
The method of claim 1, wherein between 0.01 and 5% of the stabiizing agent, based on the weight of the susceptible material, is incorporated in or applied to said material.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |