申请人:TAKEDA CHEMICAL INDUSTRIES, LTD.
公开号:EP0874012A1
公开(公告)日:1998-10-28
In the coating composition for a optical fiber of the present invention, a polyurethane (meth)acrylate oligomer (A), which is based on a urethane prepolymer having an equivalent ratio of NCO group in a polyisocyanate (a) to OH group in a polyol (b) of more than 3.0, is used and the oligomer (A) has a mixing weight ratio of an oligomer (d) having a number average molecular weight of 800 or less to an oligomer (e) having a number average molecular weight of 1,000 or more of 30/70 - 70/30.
The coating composition of this invention has a low viscosity, and therefore, is suitable for a rapid fiber-drawing in a production of an optical fiber. Further, a cured material obtained from the coating composition of the present invention has both a high elastic modulus and a high elongation, which properties are required for a hard material, and has a slight change of elastic modulus with a change of temperature to improve a long-term reliability of an optical fiber.
在本发明的光纤涂层组合物中,使用了一种聚氨酯(甲基)丙烯酸酯低聚物(A),该低聚物基于聚氨酯预聚物,其多异氰酸酯(a)中的NCO基团与多元醇(b)中的OH基团的当量比大于3.0,并且低聚物 (A) 的平均分子量为 800 或以下的低聚物 (d) 与平均分子量为 1,000 或以上的低聚物 (e) 的混合重量比为 30/70 - 70/30。
本发明的涂层组合物粘度低,因此适用于光纤生产中的快速拉丝。此外,用本发明的涂层组合物制成的固化材料具有硬质材料所需的高弹性模量和高伸长率,并且弹性模量随温度变化而略有变化,从而提高了光纤的长期可靠性。