M.a. Hanna Company

Zeon Chemicals L.p.

Michael Wayne Chase

Carl David McAfee

David Thomas Hughes

Donald C Grimm

Milton Farber

Piseth Lov

The present invention relates to a high clarity water-sensitive carboxylated nitrile rubber composition which is particularly useful in making photopolymer formulations for printing plates utilized in flexographic printing applications. The present invention more specifically discloses a high clarity water-sensitive carboxylated nitrile rubber composition which is comprised of (a) a carboxylated nitrile rubber which is comprised of repeat units which are derived from about 33 weight percent to about 77 weight percent 1,3-butadiene, from about 15 weight percent to about 45 weight percent acrylonitrile and from about 8 weight percent to about 22 weight percent methacrylic acid and (b) from about 1 to about 10 phr of at least one organic acid which contains at least three carboxyl groups. The carboxylated nitrile rubber of this invention will typically have a Mooney ML-4 viscosity of less than about 80 and a volume swell of greater than 40 percent. It will also have sufficient clarity to allow print having 6-point font to be read through a 0.125-inch thick sheet of said carboxylated nitrile rubber. In applications where improved scorch safety is required, the rubber composition will also contain from about 0.1 phr to about 7 phr of at least one oligomerized fatty acid.

High clarity carboxylated nitrile rubber

A water processable photopolymer composition for use in the manufacture of flexographic photopolymer printing plates is disclosed. The composition includes a flexible polymer having an affinity for water combined with a combination of hydrophilic and hydrophobic ethylenically unsaturated crosslinking agents or a single crosslinking agent containing both groups, a photoinitiator and swell enhancing components.

Composition for the manufacture of flexographic printing plates

A water processable photopolymeric composition for use in the manufacture of flexographic photopolymer printing plates is disclosed. Preferably, the flexomer blend includes a flexomer having an affinity for water combined with a hydrophilic crosslinking agent, a nonhydrophilic crosslinking agent, a swell enhancing filler, a hydrophilic plasticizer, a compatibilizer and a surfactant. The compatibilizer aids the blending of the hydrophilic components with the flexomer blend.

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Arlington, TX, United States of America

Michael Wayne Chase