US3860558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized polyamide compositions
Assignee: Novartis Corp
•
Filing: 1970-12-07
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Granted: 1975-01-14
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Expires: 1990-12-07
Abstract
Abstract Heat stabilized synthetic polyamide compositions are prepared by incorporating therein a mixture of a phenolic antioxidant and metal hypophosphite. A typical embodiment includes polyamides which are stabilized with 1,2-bis(3-(3,5-di-t-butyl-4hydroxyphenyl)propionamido)ethane and sodium hypophosphite.
Inventors
- 👤 Peter Klemchuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:40
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32; C08K13/00; C08K13/02; C08K5/00; C08K5/04; C08K5/13
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
The composition of matter of claim 1 wherein the metal hypophosphite is sodium hypophosphite or potassium hypophosphite, wherein the concentration of said hypophosphite is in the range of about 0.05 to about 0.15 weight percent and the concentration of said phenolic antioxidant is in the range of about 0.05 to about 0.2 weight percent.
Claim 2
Dependent Claim
14 words
The composition of matter of claim 1 wherein the hindered phenolic compound is 1,6-bis(3-(3,5-di-t-butyl-4-hydroxyphenyl)propionamido)hexane.
Claim 3
Dependent Claim
14 words
The composition of matter of claim 1 wherein the hindered phenolic compound is 1,2-bis(3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionamido)ethane.
Claim 4
Dependent Claim
14 words
The composition of matter of claim 1 wherein the hindered phenolic compound is 1,4-bis(3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionamidomethyl)cyclohexane.
Claim 5
Dependent Claim
14 words
The composition of matter of claim 1 wherein the hindered phenolic compound is N,N''-bis(3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyl)piperazine.
Claim 6
Dependent Claim
14 words
The composition of matter of claim 1 wherein the hindered phenolic compound is 1,6-bis(3-(3-methyl-4-hydroxy-5-t-butylphenyl)-propionamido)hexane.
Claim 7
Dependent Claim
14 words
The composition of matter of claim 1 wherein the hindered phenolic compound is 1,2-bis(3-methyl-4-hydroxy-5-t-butylphenyl)-propionamido)ethane.
Claim 8
Dependent Claim
14 words
The compositions of matter of claim 1 wherein the hindered phenolic compound is N,N''-bis(3,5-di-t-butyl-4-hydroxybenzyl)adipamide.
Claim 9
Dependent Claim
14 words
The composition of matter of claim 1 wherein the hindered phenolic compound is bis(N-(3,5-di-t-butyl-4-hydroxybenzyl)propionamide)sulfide.
References Cited (Backward Citations)
US2510777A
Cited
US3435065A
Cited
US3533986A
Cited
US3584047A
Cited
US3595829A
Cited
US3493633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |