US4522996A
Expired / Lapsed
US
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β-eliminating polymers for diffusion control in photographic products
Assignee: Polaroid Corp
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Filing: 1984-06-26
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Granted: 1985-06-11
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Expires: 2004-06-26
Abstract
Abstract Polymerizable monomeric carbamates are disclosed. Polymers comprising recurring units from such carbamates undergo beta -elimination in an alkaline environment and are useful in diffusion control layers in diffusion transfer photographic products.
Inventors
- 👤 Lloyd D. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:31
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/46; C07D333/48; G; G03; G03C; G03C8/00; G03C8/42; G03C8/52; G03C8/54
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A polymer comprising recurring units having the formula ##STR29## wherein R is hydrogen, halogen or lower alkyl; R 1 is alkylene; and Z is an organic moiety capable under alkaline conditions of undergoing a β-elimination reaction, said moiety containing at least two interbonded carbon atoms, one of the carbon atoms containing an acid-labile proton capable of abstraction under said alkaline conditions and an activating group effective to activate said β-elimination reaction.
Claim 2
Dependent Claim
71 words
A polymer comprising recurring units having the formula ##STR29## wherein R is hydrogen, halogen or lower alkyl; R 1 is alkylene; and Z is an organic moiety capable under alkaline conditions of undergoing a β-elimination reaction, said moiety containing at least two interbonded carbon atoms, one of the carbon atoms containing an acid-labile proton capable of abstraction under said alkaline conditions and an activating group effective to activate said β-elimination reaction.
Claim 3
Dependent Claim
52 words
The polymer of claim 1 wherein said moiety Z is a β-elimination moiety of the formula ##STR30## wherein A, D and E are independently hydrogen, methyl or phenyl, provided that not more than one of A, D and E is methyl or phenyl and Y is an activating group for said β-elimination.
Claim 4
Dependent Claim
69 words
The polymer of claim 2 wherein said β-elimination activating group Y is selected from the group consisting of sulfones of the formula --SO 2 W wherein W is aryl, aralkyl, alkaryl, alkyl, amino, or substituted amino; carbonyl groups of the formula ##STR31## wherein T is hydrogen, alkyl, alkoxy, amino, or substituted amino; sulfoxide groups of the formula ##STR32## wherein G is aryl, alkyl, alkaryl, or aralkyl; nitro and cyano.
Claim 5
Dependent Claim
14 words
The polymer of claim 2 wherein each of A, D and E is hydrogen.
Claim 6
Dependent Claim
10 words
The polymer of claim 4 wherein R 1 is ethylene.
Claim 7
Dependent Claim
15 words
The polymer of claim 2 wherein Y is --SO 2 W wherein W is alkyl.
Claim 8
Dependent Claim
25 words
The polymer of claim 2 wherein R is methyl, R 1 is ethylene, each of A, D and E is hydrogen and Y is methylsulfonyl.
Claim 9
Dependent Claim
63 words
The polymer of claim 1 wherein said moiety Z is a β-elimination moiety of the formula ##STR33## wherein Y is a divalent radical ##STR34## A represents the atoms necessary with Y to complete a four- to seven-membered ring structure, and D and E are independently hydrogen, methyl or phenyl, provided that not more than one of D and E is methyl or phenyl.
Claim 10
Dependent Claim
22 words
The polymer of claim 8 wherein D and E are each hydrogen, Y is ##STR35## A is --CH 2 --CH 2 --.
Claim 11
Dependent Claim
14 words
The polymer of claim 9 wherein R is methyl and R 1 is ethylene.
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |