Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1996-02-20
1998-01-27
Gorr, Rachel
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
528 49, 528 75, 528 76, 528 79, 522 97, 526301, 525455, 385128, 428903, 428500, C08G 1804
Patent
active
057120358
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a liquid curable resin composition which has superior curing characteristics, durability, and the like, adheres well to various types of substrates, and is therefore useful as a coating material for plastics, wood, porcelain, glass, paper, and the like, and as an optical molding material, three-dimensional molding material, printing plate material, and the like.
DESCRIPTION OF THE PRIOR ART
Generally, an optical fiber is provided with a resin coating comprising a flexible primary coating layer on the surface of the optical fiber, with the object of protecting and reinforcing the bare optical fiber threads immediately after hot melt spinning of the glass fiber, the outside of which is covered in turn by a secondary coating layer. The coating material used to form these coatings must have the following characteristics: changes; time;
To meet these requirements various liquid coating materials of the radiation curable type have been developed. They are compositions containing urethane acrylate using, for example, tetrahydrofuranethylene oxide ring opening copolymers (Japanese patent Laid-open (ko-kai) No. 86450/1986), tetrahydrofuranpropylene oxide ring opening copolymer (Japanese Patent Laid-open (ko-kai) No. 181170/1985), or tetrahydrofuranalkyltetrahydrOfuran copolymers (Japanese Patent Laid-open (ko-kai) No. 115964/1989).
Compositions in which these polyether copolymers are used have drawbacks still to be solved. That is, urethane acrylates using these polyether copolymers are insufficient in one or more of the characteristics, including resistance to ultraviolet light, heat resistance, light resistance (resistance against changing its color into yellow under light radiation), heat resistance (resistance against changing its color into yellow when heated), and flexibility.
Accordingly, an object of the present invention is to provide, with due consideration to the drawbacks of such conventional compositions, a liquid curable resin composition ideal as a covering material for optical fiber, which has a low viscosity at room temperature and exhibits good processability when used to cover optical fibers, has good optical curing characteristics, can accommodate high speed optical fiber production, and in the cured state shows excellent flexibility, good resistance to heat, ultraviolet light, and oil, and exhibits suitable adherence to optical fiber.
SUMMARY OF THE INVENTION
This object is achieved in the present invention by the provision of a liquid curable resin composition comprising a urethane (meth)acrylate obtained by the reaction of: represented by the following formulae (1), (2), and (3), ##STR2## wherein R represents an alkyl group containing two or more carbon atoms, and R.sup.1 and R.sup.2 are independently selected from a hydrogen atom or a methyl group; extremely low Young's modulus at room temperature, shows a suitable adhering strength to glass fiber, has superior durability, exhibits high speed curing performance, and is thus suitable as a coating material for optical fiber.
DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS
A polyether polyol compound (hereinafter referred to as polyol compound (A)) used in the present invention must contain structural units of the above formulae (1), (2), and (3). There are no limitations as to the manner in which these structural units are polymerized. They may be polymerized by random, block, or graft polymerization.
Such a polyol compound (A) can be prepared by the ring-opening polymerization of ethylene oxide, 1,2-alkylene oxides with 4 or more carbon atoms, e.g, 1,2-butylene oxide, 1,2-hexene oxide, or the like, and one or more compounds selected from polytetramethylene glycol, bisphenol A, and bisphenol F, by a known method.
The proportion of structural unit (1) contained in polyol compound (A) is 5 to 50% by weight, and preferably 10 to 45%. If the amount of the structural unit (1) is less than 5%, improvement in the oil resistance of the composition after curing is insuffi
REFERENCES:
patent: 4507458 (1985-03-01), Shiraki
patent: 4844604 (1989-07-01), Bishop et al.
Igarashi Katutoshi
Iwanaga Shin-ichirou
Ohtaka Tohru
Watanabe Tsuyoshi
DSM N.V.
Gorr Rachel
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