Printing rollers
AssigneeH.B. Fuller Licensing & Financing, Inc.
InventorsHorst Stimmelmayr, Kai Horeis
Life of this patent
Estimating the term…
Abstract
Printing rollers and sleeves for printing rollers can be provided with a high quality top coat composition which can improve various properties such as solvent resistance, cut resistance, and thermal stability (with respect to dimensional stability and hardness stability), and reduce manufacturing time and costs. A polyurethane top coat composition is used with filler present in an amount of from about 15-70% by weight of the coating. The coatings may also include a low density, high hardness foam underlayer which can be applied without a molding operation.
Claims5
A printing roller comprising:
- a) a cylindrical substrate;
- b) a foam base coat having a degree of compressibility of less than about 2% on press during printing, said foam base coat is interposed between said cylindrical substrate and a top coat, and
- c) a top coat comprising a 2-component polyurethane resin having from about 15% to about 70% by weight of solid particles dispersed therein and a Shore D hardness of at least about 40 at room temperature,
- wherein said 2-component polyurethane comprises:
- a) component A comprising:
- I) from about 20% to about 80% by weight of at least one polyol;
- ii) about 1% to about 20% by weight of at least one low molecular weight crosslinking agent having isocyanate reactive groups;
- iii) about 0.1% to about 1.5% by weight of water;
- and
- iv) up to about 50% by weight of at least one filler;
- and
- b) component B comprising a liquid isocyanate hardener having a functionality of at least 2;
- wherein the mixing ratio of said component A to said component B ranges from about 0.8/1 to about 1.2/1.
A printing roller comprising:
- a) a cylindrical substrate;
- b) a foam base coat having a degree of compressibility of less than about 2% on press during printing, said foam base coat is interposed between said cylindrical substrate and a top coat, and
- c) a top coat comprising a polyurethane resin having from about 15% to about 70% by weight of solid particles dispersed therein and a Shore D hardness of at least about 40 at room temperature,
- wherein said polyurethane comprises:
- a) component A comprising:
- i) from about 20% to about 80% by weight of at least one polyol;
- ii) about 1% to about 20% by weight of at least one low molecular weight crosslinking agent having isocyanate reactive groups;
- iii) about 0.1% to about 1.5% by weight of water;
- and
- iv) up to about 50% by weight of at least one filler;
- and
- b) component B comprising a liquid isocyanate hardener having a functionality of at least 2;
- wherein the mixing ratio of said component A to said component B ranges from about 0.8/1 to about 1.2/1.
Dependencies are inferred from the claim text.