UV-THICKENING THERMALLY CONDUCTIVE SILICONE GREASE COMPOSITIONA UV-thickening thermally conductive silicone grease composition: which has (A) an organopolysiloxane, the viscosity at 25° C. of which is 50-100,000 mPa·s and which contains at least one alkenyl group in a single molecule, (B) an organohydrogenpolysiloxane, a single molecule of which contains a hydrogen atom directly bonded to at least two silicon atoms, (C) a photoactive platinum complex curing catalyst, and (D) a thermally conductive filler with a thermal conductivity of at least 10 W/m·° C. as essential components; and the viscosity at 25° C. of which is 30-800 Pa·s when measured at a 10 rpm rotation rate using a Malcom viscometer. For this UV-thickening thermally conductive silicone grease composition, shape-retaining properties at low viscosity are high, deep curing properties can be adjusted using the UV irradiation dose, and the composition after being thickened by irradiating UV rays does not become hard but sets so as to be malleable.A UV-thickening, heat-conductive silicone grease composition comprising, as essential components, (A) 100 parts by weight of an organopolysiloxane having a viscosity of 50 to 100,000 mPa·s at 25° C. and containing at least one alkenyl group per molecule,(B) an organohydrogenpolysiloxane containing at least two silicon-bonded hydrogen atoms per molecule in such an amount that the number of Si—H groups divided by the number of alkenyl groups in the composition may fall in the range from 0.1 to 5.0,(C) an effective amount of a photoactive platinum complex curing catalyst selected from the group consisting oftrimethyl(acetylacetonato)platinum complex,trimethyl(2,4-pentanedionate)platinum complex,trimethyl(3,5-heptanedionate)platinum complex,trimethyl(methylacetoacetate)platinum complex,bis(2,4-pentanedionato)platinum complex,bis(2,4-hexanedionato)platinum complex,bis(2,4-heptanedionato)platinum complex,bis(3,5-heptanedionato)platinum complex,bis(1-phenyl-1,3-butanedionato)platinum complex,bis(1,3-diphenyl-1,3-propanedionato)platinum complex,(1,5-cyclooctadienyl)dimethyl platinum complex,(1,5-cyclooctadienyl)diphenyl platinum complex,(1,5-cyclooctadienyl)dipropyl platinum complex,(2,5-norbornadiene)dimethyl platinum complex,(2,5-norbornadiene)diphenyl platinum complex,(cyclopentadienyl)dimethyl platinum complex,(methylcyclopentadienyl)diethyl platinum complex,(trimethylsilylcyclopentadienyl)diphenyl platinum complex,(methylcycloocta-1,5-dienyl)diethyl platinum complex,(cyclopentadienyl)trimethyl platinum complex,(cyclopentadienyl)ethyldimethyl platinum complex,(cyclopentadienyl)acetyldimethyl platinum complex,(methylcyclopentadienyl)trimethyl platinum complex,(methylcyclopentadienyl)trihexyl platinum complex,(trimethylsilylcyclopentadienyl)trimethyl platinum complex,(dimethylphenylsilylcyclopentadienyl)triphenyl platinum complex, and(cyclopentadienyl)dimethyltrimethylsilylmethyl platinum complex, and (D) 100 to 20,000 parts by weight of a heat-conductive filler having a thermal conductivity of at least 10 W/m·° C.,the composition having a viscosity of 30 to 800 Pa·s at 25° C. as measured by a Malcom viscometer at a rotational speed of 10 rpm.
자외선 증점형 열전도성 실리콘 그리스 조성물(A) 25℃에서의 점도가 50∼100,000mPa·s이며, 1분자 중에 적어도 1개의 알켄일기를 함유하는 오가노폴리실록세인, (B) 1분자 중에 적어도 2개의 규소 원자에 직결한 수소 원자를 함유하는 오가노하이드로젠폴리실록세인, (C) 광활성형 백금 착체 경화 촉매, (D) 10W/m·℃ 이상의 열전도율을 갖는 열전도성 충전제를 필수 성분으로 하고, 25℃에서의 점도가 말콤 점도계에 의한 회전수 10rpm 측정시에 있어서 30∼800Pa·s인 자외선 증점형 열전도성 실리콘 그리스 조성물. 본 발명의 자외선 증점형 열전도성 실리콘 그리스 조성물은 저점도이며 형상 유지성도 높고, 자외선 조사량에 의해 심부 경화성의 조정도 가능하여, 자외선을 조사시켜 증점시킨 후의 이 조성물은 딱딱하게 되지 않고 유연하게 굳어진다. (A) 25℃에서의 점도가 50∼100,000mPa·s이며, 1분자 중에 적어도 1개의 알켄일기를 함유하는 오가노폴리실록세인: 100질량부,(B) 1분자 중에 적어도 2개의 규소 원자에 직결한 수소 원자를 함유하는 오가노하이드로젠폴리실록세인이며, 또한 {Si-H기의 개수}/{조성물 중의 알켄일기의 개수}가 0.1∼5.0이 되는 양,(C) 트라이메틸(아세틸아세토네이토)백금 착체, 트라이메틸(2,4-펜테인다이오네이트)백금 착체, 트라이메틸(3,5-헵테인다이오네이트)백금 착체, 트라이메틸(메틸아세토아세테이트)백금 착체, 비스(2,4-펜테인다이오네이토)백금 착체, 비스(2,4-헥세인다이오네이토)백금 착체, 비스(2,4-헵테인다이오네이토)백금 착체, 비스(3,5-헵테인다이오네이토)백금 착체, 비스(1-페닐-1,3-뷰테인다이오네이토)백금 착체, 비스(1,3-다이페닐-1,3-프로페인다이오네이토)백금 착체, (1,5-사이클로옥타다이엔일)다이메틸백금 착체, (1,5-사이클로옥타다이엔일)다이페닐백금 착체, (1,5-사이클로옥타다이엔일)다이프로필백금 착체, (2,5-노보나다이엔)다이메틸백금 착체, (2,5-노보나다이엔)다이페닐백금 착체, (사이클로펜타다이엔일)다이메틸백금 착체, (메틸사이클로펜타다이엔일)다이에틸백금 착체, (트라이메틸실릴사이클로펜타다이엔일)다이페닐백금 착체, (메틸사이클로옥타-1,5-다이엔일)다이에틸백금 착체, (사이클로펜타다이엔일)트라이메틸백금 착체, (사이클로펜타다이엔일)에틸다이메틸백금 착체, (사이클로펜타다이엔일)아세틸다이메틸백금 착체, (메틸사이클로펜타다이엔일)트라이메틸백금 착체, (메틸사이클로펜타다이엔일)트라이헥실백금 착체, (트라이메틸실릴사이클로펜타다이엔일)트라이메틸백금 착체, (다이메틸페닐실릴사이클로펜타다이엔일)트라이페닐백금 착체, 및(사이클로펜타다이엔일)다이메틸트라이메틸실릴메틸백금 착체로부터 선택되는 광활성형 백금 착체 경화 촉매: 유효량,(D) 10W/m·℃ 이상의 열전도율을 갖는 열전도성 충전제: 100∼20,000질량부를 필수 성분으로 하고, 25℃에서의 점도가 말콤 점도계에 의한 회전수 10rpm 측정시에 있어서 30∼800Pa·s인 것을 특징으로 하는 자외선 증점형 열전도성 실리콘 그리스 조성물.