US3986981A
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Antioxidants of bisphenolic polymers
Assignee: Raychem Corp
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Filing: 1974-06-21
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Granted: 1976-10-19
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Expires: 1994-06-21
Abstract
Abstract For incorporation in normally oxidizable polymers, polymeric antioxidants characterized by repeating hindered bisphenolic units, the average number of said units per polymeric chain in said composition being from about 2 to 10, preferably about 2 to 7, most preferably about 2 to 4. The antioxidants are prepared by oxidative coupling of appropriate bisphenols, as by reaction with a ferricyanide coupling agent. Polymer-antioxidant combinations formed according to the invention have excellent high temperature oxidative stability, high resistance to polymer damage by massive doses of ionizing radiation and the antioxidant does not release significant amounts of condensable species when subjected simultaneously to conditions of high vacuum and elevated temperatures.
Inventors
- 👤 Bernard J. Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:05
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/005; C09; C09K; C09K15/00; C09K15/04; C09K15/06; C09K15/08; C09K15/12; C09K15/14
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
103 words
An antioxidant composition comprising a mixture of bisphenolic polymers of formula ##EQU1## wherein n is an integer of from 2 to about 12 and wherein, Y is independently chosen from the group consisting of sulfur, methylene and butylidene, and for each bisphenolic repeating unit --Z - Y - X-- , Z and X are independently selected from the group consisting of ##SPC7## R 2 and R 3 being independently selected from the group consisting of hydrogen and alkyl, cycloalkyl, aryl and alkaryl groups having from 1 to 8 carbon atoms, R 4 being an alkyl group of from 4 to 8 carbon atoms.
Claim 2
Dependent Claim
103 words
An antioxidant composition comprising a mixture of bisphenolic polymers of formula ##EQU1## wherein n is an integer of from 2 to about 12 and wherein, Y is independently chosen from the group consisting of sulfur, methylene and butylidene, and for each bisphenolic repeating unit --Z - Y - X-- , Z and X are independently selected from the group consisting of ##SPC7## R 2 and R 3 being independently selected from the group consisting of hydrogen and alkyl, cycloalkyl, aryl and alkaryl groups having from 1 to 8 carbon atoms, R 4 being an alkyl group of from 4 to 8 carbon atoms.
Claim 3
Dependent Claim
16 words
An antioxidant polymer according to claim 1 wherein each R 4 is a tertiary alkyl group.
Claim 4
Dependent Claim
15 words
An antioxidant polymer according to claim 1 wherein each Z and X moiety are ##SPC8##
Claim 5
Dependent Claim
15 words
An antioxidant polymer according to claim 3 wherein R 4 is a tertiary alkyl group.
Claim 6
Dependent Claim
20 words
An antioxidant according to claim 1 wherein R 2 is methyl, R 3 is hydrogen, and R 4 is t-butyl.
Claim 7
Dependent Claim
20 words
An antioxidant according to claim 3 wherein R 2 is methyl, R 3 is hydrogen, and R 4 is t-butyl.
Claim 8
Dependent Claim
11 words
An antioxidant polymer according to claim 1 wherein Y is sulfur.
Claim 9
Dependent Claim
11 words
An antioxidant polymer according to claim 1 wherein Y is methylene.
Claim 10
Dependent Claim
11 words
An antioxidant polymer according to claim 1 wherein Y is butylidene.
Claim 11
Dependent Claim
102 words
An antioxidant composition of bisphenolic polymers of structure ##STR2## wherein average n for said composition is from about 2 to about 4 an wherein Y is chosen from the group consisting of sulfur, methylene and butylidene independently, and for each bisphenolic repeating unit -- Z - Y - X--, Z and X are independently selected from the group consisting of ##SPC9## R 2 and R 3 being independently selected from the group consisting of hydrogen and alkyl, cycloalkyl, aryl or alkaryl groups having from 1 to 8 carbon atoms, R 4 being an alkyl group of from 4 to 8 carbon atoms.
Claim 12
Dependent Claim
102 words
An antioxidant composition of bisphenolic polymers of structure ##STR2## wherein average n for said composition is from about 2 to about 4 an wherein Y is chosen from the group consisting of sulfur, methylene and butylidene independently, and for each bisphenolic repeating unit -- Z - Y - X--, Z and X are independently selected from the group consisting of ##SPC9## R 2 and R 3 being independently selected from the group consisting of hydrogen and alkyl, cycloalkyl, aryl or alkaryl groups having from 1 to 8 carbon atoms, R 4 being an alkyl group of from 4 to 8 carbon atoms.
Claim 13
Dependent Claim
14 words
A composition according to claim 10 wherein R 4 is a tertiary alkyl group.
Claim 14
Dependent Claim
14 words
A composition according to claim 10 wherein each Z and X moiety is ##SPC10##
Claim 15
Dependent Claim
20 words
A composition according to claim 10 wherein R 2 is methyl, R 3 is hydrogen, and R 4 is t-butyl.
Claim 16
Dependent Claim
20 words
A composition according to claim 10 wherein R 4 is a tertiary alkyl group, and Y is sulfur or butylidene.
Claim 17
Dependent Claim
26 words
A composition according to claim 10 wherein R 2 is methyl, R 3 is hydrogen, and R 4 is t-butyl, and Y is sulfur or butylidene.
References Cited (Backward Citations)
US3637809A
Cited
US3743623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |