Laser-engravable flexographic printing elements having...

Details Laser-engravable flexographic printing elements having... Laser-engravable flexographic printing elements having...

2006-09-05

2006-09-05

Lee, Sin (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

C430S271100, C430S306000, C430S905000, C430S907000, C430S944000, C430S945000, C430S307000, C430S300000, C430S286100, C430S287100, C430S288100, C430S281100, C430S285100, C430S348000, C430S349000, C430S494000, C430S964000

Reexamination Certificate

active

07101653

ABSTRACT:
A laser-engravable flexographic printing element comprising an elastomeric, relief-forming, laser-engravable, thermally and/or photochemically crosslinkable layer comprising, as binder, at least 5% by weight of syndiotactic 1,2-polybutadiene having a content of 1,2-linked butadiene units of from 80 to 100%, a degree of crystallinity of from 5 to 30% and a mean molecular weight of from 20,000 to 300,000 g/mol on a flexible, dimensionally stable support.The elastomeric, relief-forming, laser-engravable layer preferably comprises:(a) from 50 to 99.9% by weight of one or more binders as component A consisting of(a1) from 5 to 100% by weight of syndiotactic 1,2-polybutadiene having a content of 1,2-linked butadiene units of from 80 to 100%, a degree of crystallinity of from 5 to 30% and a mean molecular weight of from 20,000 to 300,000 g/mol as component A1, and(a2) from 0 to 95% by weight of further binders as component A2,(b) from 0.1 to 30% by weight of crosslinking, oligomeric plasticizers which contain reactive groups in the main chain and/or reactive pendant and/or terminal groups as component B,(c) from 0 to 25% by weight of ethylenically unsaturated monomers as component C,(d) from 0 to 10% by weight of photoinitiators and/or thermally decomposable initiators as component D,(e) from 0 to 20% by weight of absorbers for laser radiation as component E, and(f) from 0 to 30% by weight of further conventional additives as component F.

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