Sun Chemical Corporation

Saeid Savarmand

Richard R Durand, Jr

Philippe Schottland

Stephen Postle

Christian Johnke

Bo Sun

Jerome Moyer

Richard Durand

Paul Kurtz

Jerome A Fox

Ewelina Szymczak

Jean-Hugues Blaizeau

Jerome Fox

The present invention provides a hot melt adhesive, comprising polyester resins with a Tg below 0° C. and frequently combined with polyester resins with a Tg above 50° C. that can be applied at 80° C. or lower, having excellent impact resistance and broad chemical resistance. The hot melt adhesive of the invention is ideally suited for use in the manufacture of handheld and wearable electronic devices.

Low bond-temperature hot melt adhesive with high impact strength and chemical resistance

The present invention provides cleaning solutions for removing ink, coating, varnish, adhesive, etc. residue from printing equipment. The cleaning solutions of the present invention comprise one or more solvents, preferably selected from acetoacetates, alcohols, glycol ethers, glycol esters, terpenes, and water, and are preferably free of surfactants. The cleaning solutions of the invention have a relative evaporation time (RET) of less than 60 seconds, and a ratio of the RET to the radius of the sphere of solubility of the resin in the ink to be removed of less than 6.

Cleaning solution

Solvent-based flexographic or rotogravure inks are formulated to provide good pin-holing performance at high-speed printing conditions by combining the ink ingredients such the Maron-Pierce MPF (Maximum Packing Fraction) of the resulting ink is below 42 volume percent at a shear of either 10 reciprocal seconds or 2100 reciprocal seconds or both.

High speed solvent-based flexographic/rotogravure printing inks

An ink for high-speed printing is formulated by controlling the phase angle of the ink to less than 60&#xb0; at a frequency of 10 Hz when the ratio of the total non-volatiles volume fraction of the ink to the maximum total non-volatiles volume fraction of the ink is a ratio between about 0.40 to about 0.90. An ink for high-speed printing includes one or more resins, one or more colorants, one or more solvents, and one or more additives. The ink can be a flexographic ink, a rotogravure ink, a heatset offset ink, or a publication gravure ink. A print of the ink includes less than 1% of pinholes by area. The ink is applied to a substrate, which moves at a speed of greater than 1200 feet/min.

Viscoelasticity of inks for high speeding printing

An ink or coating composition is rheologically tested at three or more temperatures which substantially cover the anticipated range of printing operation temperatures expected to be encountered during printing to determine the value of the rheological parameters viscous modulus, phase angle and phase-angle slope, and to identify values of these parameters encountered during printing around which the structural behavior of the ink or coating changes. An ink composition that has a phase angle of at least 55&#xb0;, a viscous modulus of at least 150 Pa, and a phase-angle slope of at least &#x2212;0.5&#xb0;/&#xb0; C. exhibits low misting when employed in high speed printing apparatus.

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Bergenfield, NJ, United States of America

Saeid Savarmand