PROBLEM TO BE SOLVED: To provide a silicone elastomer composition for forming a cured product having suitable hardness for a tube for medical use while having no yield point, and still showing excellent elongation property as well as strength at the time of cutting, and provide an elastic member for medical use and a tube for medical use made of this composition.SOLUTION: A silicone elastomer composition contains (A) 100 parts by weight of organopolysiloxane of a crude rubber type containing the following ingredients at a mass ratio of 10/90-95/5: (A1) organopolysiloxane that has the alkenyl group only at molecular chain terminal, (A2) organopolysiloxane that has an alkenyl group at molecular chain terminal and side chain and has a content of the alkenyl group in less than 0.10 mass%, (B) organopolysiloxane having a content of the alkenyl group in 0.50-20.0 mass%, (C) organohydrogenpolysiloxane, (D) an inorganic filler, and (E) an addition reaction catalyst. This silicone elastomer composition gives a cured product having 40 or more of hardness, 500% or more of elongation at cutting, and 7.0 MPa or more of tensile strength.COPYRIGHT: (C)2013,JPO&INPIT【課題】医療用チューブに好適な硬度を有し、降伏点を有さず、かつ良好な切断時伸び特性および強度を示す硬化物を形成するシリコーンエラストマー組成物、それを用いてなる医療用弾性部材、医療用チューブを提供する。【解決手段】(A)以下の成分が10/90~95/5の質量比で含まれる、生ゴム状のオルガノポリシロキサン100質量部(A1)分子鎖末端のみにアルケニル基を有するオルガノポリシロキサン、(A2)分子鎖末端・側鎖にアルケニル基を有し、かつアルケニル基の含有量が0.10質量%未満であるオルガノポリシロキサン(B)アルケニル基の含有量が0.50~20.0質量%であるオルガノポリシロキサン、(C)オルガノハイドロジェンポリシロキサン、(D)無機質充填剤、(E)付加反応触媒を含有してなり、硬度が40以上、切断時伸びが500%以上、引張り強さが7.0MPa以上の硬化物を与えるシリコーンエラストマー組成物。【選択図】図1
