US3658531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making flexible printing plates
Assignee: Goodrich Corp
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Filing: 1970-10-29
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Granted: 1972-04-25
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Expires: 1990-10-29
Abstract
Abstract Soluble, sulfur-curable polyetherurethanes, reaction products of organic diisocyanates and polyalkyleneether glycols, which are chain extended with an active hydrogen bearing compound such as a nonpolymeric glycol, with either main chain unsaturation or side chains containing terminal -CH = CH2 groups present in any of the active hydrogen bearing reactants, are sensitized with aromatic ketones and insolubilized by exposure to U.V. light (3,100* 4,300* A). Plates for flexographic printing are prepared from these materials.
Inventors
- 👤 Donald M Kurtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/81; C08G18/8125; C08F; C08F299/00; C08F299/02; C08F299/06; C08G18/28; C08G18/67; C08G18/675; G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0384; G03F7/0388
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
32 words
The process of claim 1 wherein said polyetherurethane A is obtained by reacting a polyalkyleneether glycol, an aromatic diisocyanate and a nonpolymeric diol chain extender, said diol bearing carbon to carbon unsaturation.
Claim 2
Dependent Claim
11 words
The process of claim 2 wherein the said diol is 3-(allyloxy)-1,2-propanediol.
Claim 3
Dependent Claim
11 words
The process of claim 2 wherein the said diol is 1,4-butenediol.
Claim 4
Dependent Claim
118 words
A process for the production of an improved flexible printing plate for letterpress printing comprising providing a homogeneous mixture consisting essentially of (A) a solvent soluble polyetherurethane containing a unit of carbon to carbon double bond unsaturation in the polymer backbone chain or in a side chain to the backbone chain for every 500 to 8,000 units of polymer molecular weight and (B) a photosensitizing agent, shaping said mixture to form a flat plate, exposing said plate through a masking transparency to actinic light of 3,100* A - 4, 300* A, washing said exposed plate in solvent for said polymer thereby dissolving unexposed portions of the surface of said plate to a depth of 10 - 25 mils.
Claim 5
Dependent Claim
23 words
The process of claim 5 wherein said photosensitizing agent is selected from the group consisting of aromatic ketones, naphthathiazolines, pyrazolines and cyanine dyes.
Claim 6
Dependent Claim
11 words
An etched rubber product produced by the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |