Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1987-01-21
1989-06-27
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
522 43, 522 44, 522 45, 522 48, 522 53, 522 91, 522 92, 522 93, 522 94, 522 95, 522 96, 522103, 350 9629, 560185, C08F 250, C08F 2020
Patent
active
048431117
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL FIELD OF UTILIZATION
The present invention relates to novel diester of (meth)acrylic acid, which can be copolymerized easily with each of the resins containing unsaturated group(s) in the presence of heat, ultraviolet ray, ionizing radiation or a radical-initiator, and resins comprising the same.
BACKGROUND OF THE INVENTION
The range of the use of optical fiber has been remarkably increased in recent years, particularly in the field of communications, because the information-transmitting capacity of optical fiber is large and optical fiber is relatively free from intervention from outside. Since optical fiber is used in the field of communication, it is generally made of glass. However, glass fiber is brittle and is chemically attacked by water vapour, and accordingly, it is easily broken and is handled with difficulty. Therefore, the surface of optical glass fiber has hitherto been coated with a resin.
As a resinous coating material for such a purpose, epoxy resin, urethane resin and the like have been hitherto used, however, since they are poor in productivity because of the necessity of a long term for curing them and they lack pliability, they have a disadvantage in the transmission specificity of the optical glass fiber coated therewith is reduced by side pressure. For the purpose of improving the above-mentioned disadvantage, the compositions containing urethane acrylate, which are curable by ultraviolet rays, have been actively investigated recently, and such a composition for optical glass fiber and a method for forming a coating have been proposed, for instance, in Japanese Patent Applications Laid-Open (KOKAI) No. 58-223638 (1983) and No. 59-170154 (1984).
In these patent applications, a primary coating of a very low modulus has been used for solving the above-mentioned problem, and a considerable success has been obtained thereby. However, for providing the low modulus, the strength and hardness necessitated to the coating on the surface of glass have been sacrificed, and accordingly, it is desirable to form a top coating onto the primary coating. Compositions for the top coating, which are curable by ultraviolet rays, have been investigated. For instance, a composition for a top coating curable by ultraviolet rays is proposed in Japanese Patent Application Laid-Open (KOKAI) No. 59-170155 (1984).
PROBLEMS TO BE SOLVED BY THE INVENTION
The top coating composition curable by ultraviolet rays which is now in use has merits in that the curing speed thereof is high and that the desired properties for coating are easily and exactly obtainable, however, such a composition has disadvantages in that the glass fiber is apt to be attacked by water because of large degree of water-absorption of the coating and the fiber is broken in the rolling up step of process because of low elongation of the cured coating.
MEANS FOR SOLVING THE PROBLEMS
The present invention provides novel diesters of (meth)acrylic acid applicable for various uses and novel resin compositions which have a high curing speed and are suitable for top-coating of the optical glass fiber for transmission by light, the elongation of the resinous coating obtained by curing the composition being large and the degree of water-absorption of the resinous coating being small.
Namely, the present invention relates to (1) diesters of (meth)acrylic acid represented by the formula (I): ##STR2## wherein the mean values of m and n are respectively 0 to 5, preferably 0 to 3; the mean value of m+n is 1 to 10, preferably 1 to 6 and R is a hydrogen atom or a methyl group, and (2) resin compositions comprising (A) polyurethane (meth)acrylate(s), (B) diester(s) of (meth)acrylic acid represented by the formula (I): ##STR3## wherein the mean values of m and n respectively 0 to 5, preferably from 0 to 3; the mean value of m+n is 1 to 10, preferably 1 to 6 and R is a hydrogen atom or a methyl group, (C) a monoethylenically unsaturated monomer(s) and (D) initiator(s) of photopolymerization as an optional component.
The diester of (meth)acrylic a
REFERENCES:
patent: 4323696 (1987-04-01), Schmitz-Josten et al.
Hattori Hideaki
Kiyomoto Masayuki
Ohkubo Tetsuo
Yokoshima Minoru
Bleutge John C.
Koeckert A. H.
Nippon Kayaku Kabushiki Kaisha
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