Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1998-03-09
2000-04-25
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
522100, 522 81, 522 75, 522909, 522170, 522181, 522 316, 522 3186, 522 3128, C08F 246
Patent
active
060545011
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a novel energy ray curable composition which may contain a pigment and to cured products thereof. More illustratively, it relates to an energy ray curable composition which has excellent curability, particularly a composition which contains a pigment and has excellent curability, and to cured products thereof.
BACKGROUND ART
Based on the energy saving, space saving, non-polluting and the like requirements which have been called for in the printing ink, paint, coating, liquid resist ink and the like fields, extensive studies on photopolymerizable compositions and materialization efforts thereof have been made. The majority of these studies, however, have been based on the radical polymerization reaction of double bond. Though cationic polymerizable substances such as epoxy resins are excellent materials in terms of physical properties, it is difficult to effect their photopolymerization, so that materials in which double bonds are introduced by acrylic modification are mainly used.
In order to effect photo-curing of epoxy resins, a method has been proposed for example in U.S. Pat. No. 3,794,576 in which an epoxy resin is polymerized by using a photosensitive aromatic diazonium salt as a photopolymerization initiator and releasing a Lewis acid from the photopolymerization initiator by decomposing it with light irradiation. However, the aromatic diazonium salt releases not only Lewis acid but also nitrogen gas by its photo- decomposition, and the gas causes foaming of a paint film of the epoxy resin when its thickness becomes 15.mu. or more, so that the salt is not suited for use in thick coating. In addition, its mixture with epoxy resin causes a problem in terms of storage stability, such as gradual progress of hardening even in the absence of light, so that it is difficult to make the mixture into a one-part composition. Thus, various attempts have been made with the aim of overcoming disadvantages of the aforementioned diazonium salt-based initiators, and, as techniques for the improvement of thick coating property and storage stability, aromatic sulfonium salt-based and aromatic iodonium salt-based initiators and curable resin compositions containing the same have been disclosed for example in Japanese Patent Publication No. 52-14278(1977), Japanese Patent Publication No. 52-14277(1977), Japanese Patent Application Kokai No. 54-53181(1979), Japanese Patent Publication No. 59-19581(1984) and Japanese Patent Application Kokai No. 56-55420(1981). However, these colored compositions are poor in curability, and its improving means have not been proposed. In addition, with the expansion of fields in which photopolymerizable compositions are used, it becomes important to provide a novel composition in order to meet the needs of the market.
DISCLOSURE OF THE INVENTION
With the aim of resolving the aforementioned problems, the inventors of the present invention have conducted intensive studies and succeeded in providing an energy ray curable composition having excellent curability and cured products thereof.
Accordingly, the present invention relates to an energy ray curable composition which comprises maximum molar absorption coefficient of 50 or more at a wave length of 360 nm or more, or a combined photopolymerization initiator of (B) with a polymerization initiator (B') which is an onium salt having a maximum molar absorption coefficient of 10,000 or more at a wave length of 360 nm or less; and if necessary products thereof.
The molar absorption coefficient is calculated based on the following formula after dissolving each onium salt in an appropriate solvent (methanol or the like for example) and measuring its absorbance at a wave length (nm) within the range of from 200 nm to 500 nm with a spectrophotometer. concentration (mol/l), d: thickness (cm))
The maximum molar absorption coefficient at a wave length of 360 nm or less is calculated from the maximum value of absorbance at a wave length (nm) within the range of from 200 nm to 360 nm according to the above
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Taniguchi Nobuo
Yokoshima Minoru
McClendon Sanza L.
Nippon Kayaku Kabushiki Kaisha
Seidleck James J.
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