WATER RELEASE TYPE INK COMPOSITION, PRINTED MATERIAL, MOLDING PRODUCT AND SEPARATION OF INK COMPOSITION COATING FILM

Japanese Patent JP3579593

B2

PROBLEM TO BE SOLVED: To obtain the subject ink composition capable of providing a printed material having excellent water resistance, if required, readily eliminating an ink coating film from a printed material in a water base by making the ink composition include a specific component in an ink composition.
SOLUTION: This water release type ink composition contains a component which is substantially water insoluble or slightly water soluble and is made water-swellable or water-soluble by saponification treatment in an ink composition. The component is preferably a random, block or graft copolymer containing 35-95 wt.% of a lower alkyl ester of at least one kind of an unsaturated carboxylic acid selected from acrylic acid, itaconic acid, fumaric acid and maleic acid as a monomer unit. Preferably the content of the component is 10-95 wt.% based on the whole composition. A method for eliminating an ink coating film using the composition is carried out by saponifying a printed material with an acid or an alkali (preferably an alkali aqueous solution). Consequently a printed coating film is readily eliminated and a printed material can be recycled and used.

Minoru Takizawa
Yasuyuki Ogisu
Naomi Oguma
Hitoshi Naganuma
Takao Mizumoto
Katsufumi Awaya
Masayuki Takahashi
Michie Nakamura

JP25771198A

October 20, 2004

September 11, 1998

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Dainichi Seika Kogyo Co., Ltd.

B41M5/00; C09D9/00; C09D11/00; C09D11/38; (IPC1-7): C09D11/00; B41M5/00; C09D9/00

JP6206369A
JP6093222A
JP8034867A
JP8034949A

Katsuhiro Yoshida
Toshieko Kondo

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