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Patent US4075175A successfully refreshed from Google Patents.
US4075175A
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Preparation of photosensitive polyaldehydes
Assignee: EIDP Inc
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Filing: 1977-01-21
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Granted: 1978-02-21
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Expires: 1997-01-21
Abstract
Abstract Preparation of photosensitive polyaldehydes which have the formula: ##STR1## WHEREIN R is a photosensitive end group selected from ##STR2## R 1 is H or n-alkyl of 1-5 carbon atoms, preferably H, R 2 is n-alkanoyl of 1-4 carbon atoms, and n is a positive integer of about 10-4000, is provided. The polyaldehydes are prepared by the anionic polymerization of the appropriate aldehyde with an initiating amount of an alkali metal or tetraalkylammonium alkoxide of RO in the above formula. The polyaldehydes are useful in articles and methods of relief imaging and in lithographic plates.
Inventors
- 👤 Robert Paul Foss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:32
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/039; C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; C08G2/14; G03F7/038; G03F7/0387
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A process for preparing a photosensitive polyaldehyde having the formula ##STR13## wherein R is a photosensitive end group selected from ##STR14## R 1 is H or n-alkyl of 1-5 carbon atoms, R 2 is n-alkanoyl of 1-4 carbon atoms, and n is a positive integer of about 10-4000, comprising: contacting and anionically polymerizing a straight chain aldehyde of 1-6 carbon atoms with an initiating amount of an alkali metal or tetraalkylammonium, where each alkyl, alike or different, is from 1-6 carbon atoms, alkoxide of the formula: ##STR15##
Claim 2
Dependent Claim
87 words
A process for preparing a photosensitive polyaldehyde having the formula ##STR13## wherein R is a photosensitive end group selected from ##STR14## R 1 is H or n-alkyl of 1-5 carbon atoms, R 2 is n-alkanoyl of 1-4 carbon atoms, and n is a positive integer of about 10-4000, comprising: contacting and anionically polymerizing a straight chain aldehyde of 1-6 carbon atoms with an initiating amount of an alkali metal or tetraalkylammonium, where each alkyl, alike or different, is from 1-6 carbon atoms, alkoxide of the formula: ##STR15##
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the aldehyde is formaldehyde.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the alkoxide is an alkali metal alkoxide of the formula: ##STR16##
Claim 5
Dependent Claim
27 words
The process of claim 1 conducted in a solvent inert to the polymerization at a temperature in the range of about -80° C to about 100° C.
Claim 6
Dependent Claim
27 words
The process of claim 3 conducted in a solvent inert to the polymerization at a temperature in the range of about -50° C to about 30° C.
Claim 7
Dependent Claim
19 words
The process of claim 5 wherein the polymerization is terminated by adding a proton source to the reaction mixture.
Claim 8
Dependent Claim
12 words
The process of claim 6 wherein the proton source is acetic acid.
Claim 9
Dependent Claim
27 words
The process of claim 6 wherein the resulting polyaldehyde is endcapped by adding an anhydride of a carboxylic acid of 1-4 carbon atoms to the reaction mixture.
Claim 10
Dependent Claim
19 words
The process of claim 7 wherein the resulting polyaldehyde is endcapped by adding acetic anhydride to the reaction mixture.
References Cited (Backward Citations)
US3991033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |