US 6,075,065 AGranted

Photocurable resin composition and a method for producing the same

AssigneesTakeda Chemical Industries, Ltd., Shin-Etsu Chemical Co., Ltd.

InventorsKyuya Yamazaki, Mitsuhiro Nishimura, Takashi Uemura, Akira Yamamoto, Shouhei Kozakai, Masatoshi Asano

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Abstract

The invention provides a photocurable resin composition which inhibits the deactivation of a bisacylphosphine oxide-series photopolymerization initiator and is useful for coating optical fibers. The photocurable resin composition comprises (A) a polyurethane (meth)acrylate oligomer, (B) an ethylenically unsaturated compound, (C) a bisacylphosphine oxide-series photopolymerization initiator, and (D) a tertiary amine and no tin component. Incorporation of the component (D) inhibits the decomposition and deactivation of the component (C). The component (A) may contain an aliphatic C.sub.14-40 polyol (hydrogenated dimerdiol, 12-hydroxystearyl alcohol) as a polyol component. This resin composition is used for a primary coating of a glass fiber or an indirect coating of an optical fiber through the primary layer, the coating layer being cured by light irradiation to provide an optical fiber coated with the resin composition.

Claims13

Dependent claims

A photocurable resin composition which comprises (A) a urethane (meth)acrylate oligomer containing a C.sub.14-40 polyol unit as a polyol component, (B) an ethylenically unsaturated compound, (C) a bisacylphosphine oxide-series photopolymerization initiator shown by the following formula (i), ##STR4## wherein R.sub.1 represents a straight or branched C.sub.1-12 alkyl group, a cycloalkyl group, or an aryl group which may be substituted with a straight or branched C.sub.1-12 alkyl group or a halogen atom;

R.sub.2 and R.sub.3 independently represent a hydrogen atom, a straight or branched C.sub.1-12 alkyl group, or a straight or branched C.sub.1-12 alkoxy group;
and R.sub.4 and R.sub.5 independently represent a hydrogen atom or a straight or branched C.sub.1-12 alkyl group, and (D) a tertiary amine as a urethanating catalyst, said photocurable resin composition having substantially no tin component and being substantially free from a tin-series catalyst to prevent the deactivation of the bisacylphosphine oxide-series photopolymerization initiator.

Dependencies are inferred from the claim text.