Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1998-01-20
2000-05-23
Berman, Susan W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
522 74, 522182, 428 641, 428 644, 428 651, 524165, 524394, 524796, C08K 542, C08K 5098, B32B 300
Patent
active
060666846
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a photopolymerizable composition and to an optical disk having a cured coating thereof. The present invention particularly relates to an antistatic hard coating composition, for an optical disk, which has a low curing shrinkage and a low viscosity.
BACKGROUND ART
Since molded articles prepared from a synthetic polymer molding material are usually significantly hydrophobic, they have a property that they tend to store a static electrical charge. The articles attract dust due to a static charge, and the static charge can cause electric shock, ignition, and the like. Consequently, the charging of the articles makes them difficult to use.
In order to prevent the charging of synthetic polymer material molded articles, it has heretofore been conducted to knead an electrically conducting agent such as carbon black and or a conductive metal powder, a surfactant, and the like into the polymer material, or to coat the molded articles with such antistatic agents. For example, Japanese Unexamined Patent Publication (Kokai) No. 63-307947 discloses a film coated with a charge-transfer complex. However, when resin molded articles, to which desired antistatic properties are imparted by using an electrically conducting agent such as a charge-transfer complex, is to be obtained, the amount of the conducting agent to be used becomes large, and other properties of the molded articles thus obtained tend to be deteriorated. Moreover, there is also a method of imparting antistatic properties to resin molded articles by adding a charge-transfer complex to an organic polymer. However, when the method is adopted, preparing molded articles having excellent transparency becomes difficult because the compatibility of the charge-transfer complex and the organic polymer is insufficient. Moreover, a large amount of an electrically conducting agent must be used to obtain a product having desired antistatic properties. Consequently, there arises the problem that the molded articles thus obtained have deteriorated properties.
In contrast to the electrically conducting agent, antistatic agents which are mainly surfactants have the advantages that many kinds of antistatic agents are known to exist, and that suitable ones can be selected so that their properties are in accordance with desired properties. Of these antistatic agents, internal addition type agents which are used by kneading them into a polymer material are disclosed in Japanese Unexamined Patent Publication (Kokai) No. 63-314261. Although such type antistatic agents have excellent antistatic properties, they have the disadvantage that satisfactory antistatic properties cannot be obtained when they are used by adding them to coating materials. On the other hand, a coating material of coating type which is applied to the surface of polymer material molded articles to impart antistatic properties thereto cannot impart sufficient antistatic effects in low humidity conditions. Moreover, the coating material may lose its antistatic effects during a drying step after the molded articles are coated therewith, during treatment such as heating, rubbing and cleaning at the time of subjecting the coated molded articles to drawing, thermosetting, shaping by heating or the like procedure, and the durability often becomes unsatisfactory.
As measures for solving such problems, Japanese Unexamined Patent Publication (Kokai) No. 63-6064 discloses the use of a coating material to which a phosphoric acid ester is added, and Japanese Unexamined Patent Publication (Kokai) No. 2-186598 proposes the use of a coating material to which a fluoro compound is added. However, even polymer material molded articles coated with a coating material containing these antistatic agents do not have well balanced mechanical strength of the coating thus formed, durability of the antistatic properties, and the like, when subjected to a long term durability test such as a humidity test.
Furthermore, a method of coating molded articles with an UV-curable coating material
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patent: 4931506 (1990-06-01), Yu
patent: 5176943 (1993-01-01), Woo
patent: 5279917 (1994-01-01), Adachi et al.
patent: 5604005 (1997-02-01), Endo et al.
patent: 5609990 (1997-03-01), Ha et al.
Fujimoto Juichi
Furukawa Kouji
Mita Takashi
Tokumizu Makoto
Berman Susan W.
Mitsubishi Rayon Co. Ltd.
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