Patent US6175588B1 successfully refreshed from Google Patents.
US3948665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminates for the manufacture of flexographic printing plates comprising photocrosslinkable reaction product of saturated polyester glycol, diisocyanate, and diol
Assignee: BASF SE
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Filing: 1974-01-02
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Granted: 1976-04-06
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Expires: 1994-01-02
Abstract
Abstract Laminates for the production of relief plates for flexographic printing, by imagewise exposure and washing out with a developer solution have, on a base optionally provided with an elastomeric layer, a photo-crosslinkable layer containing a photoinitiator and consisting of a polyurethane elastomer which has been prepared in a special manner from an aliphatic saturated polyesterglycol, an aliphatic diisocyanate, but-1-ene-3,4-diol and, if desired, another diol and which has a Shore A hardness of 30 to 90° in the photo-crosslinked state, the elastomer being optionally mixed with a photo-crosslinked monomer.
Inventors
- 👤 Peter Richter
- 👤 Herbert Stutz
- 👤 Lothar Metzinger
- 👤 Otto Volkert
- 👤 Heinz-Ulrich Werther
- 👤 August Wigger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/675; G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; G03F7/035; G03F7/09; G03F7/11
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
186 words
An element for the production of a flexographic printing plate, comprising dimensionally stable base and a photo-crosslinkable layer of a photo-crosslinkable material containing 0.01 to 10 percent by weight of photoinitiator and, if desired, further conventional additives, wherein the photo-crosslinkable material of the layer consists essentially of (a) 70 to 100 percent by weight of a non-crystallizing polyurethane elastomer which is soluble in developer and has been produced by reaction of an aliphatic saturated polyester glycol having a molecular weight of about 400 to 4,000 with an aliphatic diisocyanate and at least one low molecular weight aliphatic diol of which 25 to 100 mole percent is but-1-ene-3,4-diol, as chain extender, wherein the molar ratio is about 3 to 6 parts of diisocyanate and 2 to 5 parts of low molecular weight diol per part of polyester glycol and the NCO/OH molar ratio always being about 0.9 to 1.0 and (b) 0 to 30 percent by weight of an acrylic or allylmonomer which is substantially compatible with the polyurethane elastomer, and the layer A has a Shore A hardness of 30° to 90° in the photo-crosslinked state.
Claim 2
Dependent Claim
186 words
An element for the production of a flexographic printing plate, comprising dimensionally stable base and a photo-crosslinkable layer of a photo-crosslinkable material containing 0.01 to 10 percent by weight of photoinitiator and, if desired, further conventional additives, wherein the photo-crosslinkable material of the layer consists essentially of (a) 70 to 100 percent by weight of a non-crystallizing polyurethane elastomer which is soluble in developer and has been produced by reaction of an aliphatic saturated polyester glycol having a molecular weight of about 400 to 4,000 with an aliphatic diisocyanate and at least one low molecular weight aliphatic diol of which 25 to 100 mole percent is but-1-ene-3,4-diol, as chain extender, wherein the molar ratio is about 3 to 6 parts of diisocyanate and 2 to 5 parts of low molecular weight diol per part of polyester glycol and the NCO/OH molar ratio always being about 0.9 to 1.0 and (b) 0 to 30 percent by weight of an acrylic or allylmonomer which is substantially compatible with the polyurethane elastomer, and the layer A has a Shore A hardness of 30° to 90° in the photo-crosslinked state.
Claim 3
Dependent Claim
58 words
An element as claimed in claim 1, wherein the photo-crosslinkable is firmly bonded to a non-photo-crosslinkage layer comprising a polyurethane elastomer which is insoluble in the developer and which has a Shore A hardness of from 15° to 70° which is at least 20° Shore A less than the hardness of the photo-crosslinkable layer in the photo-crosslinked state.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |