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Patent US4238351A successfully refreshed from Google Patents.
US4238351A
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Polyarylamide, their production and their use as absorbers for ultraviolet rays
Assignee: Bayer AG
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Filing: 1976-04-12
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Granted: 1980-12-09
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Expires: 1996-04-12
Abstract
Abstract Polymers comprising terephthalyl-or oxal arylamide groups represent excellent light stabilizers for synthetic, semi-synthetic and/or naturally occurring organic materials.
Inventors
- 👤 Franz Alfes
- 👤 Wolfgang Jacob
- 👤 Karl-Heinrich Meyer
- 👤 Ludwig Bottenbruch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:55
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/20; C08; C08G; C08G69/00; C08G69/44; C08L; C08L101/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
84 words
UV-absorbers corresponding to the formula ##STR24## in which X represents the group ##STR25## Z represents a straight-chain or branched chain alkylene radical having 2 to 30 carbon atoms, optionally substituted by chlorine, or a straight-chain or branched chain alkylene radical having 2 to 35 carbon atoms interrupted by one or more oxygen atoms, R 1 to R 4 are the same or different and represent hydrogen or alkyl groups having 1 to 4 carbon atoms, and n is a number from 2 to 100.
Claim 2
Dependent Claim
84 words
UV-absorbers corresponding to the formula ##STR24## in which X represents the group ##STR25## Z represents a straight-chain or branched chain alkylene radical having 2 to 30 carbon atoms, optionally substituted by chlorine, or a straight-chain or branched chain alkylene radical having 2 to 35 carbon atoms interrupted by one or more oxygen atoms, R 1 to R 4 are the same or different and represent hydrogen or alkyl groups having 1 to 4 carbon atoms, and n is a number from 2 to 100.
Claim 3
Dependent Claim
70 words
A process for the production of the compounds claimed in claim 1, wherein 0.8 to 1.2 mol of a compound corresponding to the formula ##STR26## in which R 1 , R 2 , R 3 , R 4 and Z are as defined in claim 1, is reacted with one mol of terephthalic acid, oxalic acid or their derivatives at a temperature in the range from 0° to 170° C.
Claim 4
Dependent Claim
26 words
A process for stabilizing an organic material wherein a UV-stabilizing amount of a compound of formula (I) of claim 1 is added to the organic material.
Claim 5
Dependent Claim
31 words
The process of claim 3 wherein the compound of formula (I) is added in an amount of from 0.01 to 5% by weight, based on the organic material to be stabilized.
Claim 6
Dependent Claim
10 words
An organic material stabilized by the process of claim 3.
Claim 7
Dependent Claim
11 words
The UV-absorbers of claim 1 wherein n is 2 to 70.
Claim 8
Dependent Claim
11 words
The UV-absorbers of claim 1 wherein n is 2 to 55.
Claim 9
Dependent Claim
11 words
The UV-absorbers of claim 1 wherein n is 2 to 30.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |