Flexographic printing reliefs having increased flexibility
AssigneeE. I. Du Pont de Nemours and Company
InventorsManfred Schober, Hans L. Schroder
Life of this patent
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Abstract
Photosensitive composition comprising, inter alia, thermoplastic-elastomer block copolymer binders and addition-polymerizable monomer having terminal ethylenically unsaturated end groups wherein at least one monomer has one acrylate or methacrylate group, said monomer forms a homopolymer having a solubility parameter in the range between 7.6 and 9.6 and a glass transition temperature below 0.degree. C. and, further wherein, at least one monomer has more than one acrylate or methacrylate groups, said monomer forms a homopolymer having a solubility parameter in the range between 9.6 and 12.
Claims2
A process for edge-sealing a flexographic printing element or relief comprising sealing the edges of the element or relief with a photopolymerizable composition comprising;
- (a) at least one thermoplastic-elastomer block copolymeric binder;
- (b) at least two addition-polymerizable monomers having terminal ethylenically unsaturated groups wherein
- (i) at least one of the addition-polymerizable monomers has one acrylate or methacrylate group, said monomer forms a homopolymer having a solubility parameter in the range between 7.6 and 9.6 and a glass transition temperature below 0.degree. C.;
- (ii) at least one of the addition-polymerizable monomers has more than one acrylate or methacrylate group, said monomer forms a homopolymer having a solubility parameter in the range between 9.6 and 12;
- and
- (iii) the ratio of (i) to (ii) is in the range from 10:1 to 3:1;
- and
- (c) a photoinitiator or photoinitiating system.
A process for filling gaps between the edges of a flexographic printing element or relief comprising filling the gaps in the element or relief with a photopolymerizable composition comprising;
- (a) at least one thermoplastic-elastomer block copolymeric binder;
- (b) at least two addition-polymerizable monomers having terminal ethylenically unsaturated groups wherein
- (i) at least one of the addition-polymerizable monomers has one acrylate or methacrylate group, said monomer forms a homopolymer having a solubility parameter in the range between 7.6 and 9.6 and a glass transition temperature below 0.degree. C.;
- (ii) at least one of the addition-polymerizable monomers has more than one acrylate or methacrylate group said monomer forms a homopolymer having a solubility parameter in the range between 9.6 and 12;
- and
- (iii) the ratio of (i) to (ii) is in the range from 10.1 to 3:1;
- and
- (c) a photoinitiator or photoinitiating system.
Dependencies are inferred from the claim text.