Sealant or filler for electrical and electronic components, and electrical and electrical components
A sealant or filler of the invention for electrical and electronic components comprises a two or more liquid type organopolysiloxane composition curable by a hydrosilylation reaction, the viscosity of the composition being doubled at room temperature during 10 min. or more from the initial value obtained directly after mixing all the components, and being increased at room temperature from 5-fold to 10-fold of the initial viscosity within another 10 min. The sealant or filler for electrical and electronic components can be cured to a sufficient degree at room temperature and improve reliability of the sealed or filled components.
1. A sealant or filler for electrical and electronic components comprising a two or more liquid type organopolysiloxane composition curable by a hydrosilylation reaction, the viscosity of the composition being doubled at room temperature during 10 min, or more from the initial value obtained directly after mixing all the components, and being increased at room temperature from 5-fold to 10-fold of the initial viscosity within another 10 min.
2. The sealant or filler for electrical and electronic components according to claim 1 , wherein the organopolysiloxane composition curable by a hydrosilylation reaction is a two-liquid type composition that comprises liquid A and liquid B, wherein
liquid A comprises (a) a branched-chain or linear-chain organopolysiloxane having in one molecule at least two alkenyl groups, and (b) a linear-chain organopolysiloxane having silicon-bonded hydrogen atoms at both molecular terminals, wherein component (b) is contained in such an amount that 0.1 to 10 moles of the silicon-bonded hydrogen atoms of component (b) are present per 1 mole of the all the alkenyl groups of component (a) in the composition, and wherein liquid A is free of (c) a hydrosilylation reaction catalyst; and
liquid B comprises component (a) and component (c) in a catalytic quantity but is free of component (b).
3. The sealant or filler for electrical and electronic components according to claim 2 , wherein component (a) is an organopolysiloxane that contains alkenyl groups bonded at least to the molecular terminals.
4. The sealant or filler for electrical and electronic components according to claim 2 , wherein component (a) is an organopolysiloxane that contains alkenyl groups bonded only to the molecular terminals.
5. The sealant or filler for electrical and electronic components according to claim 2 , wherein component (a) comprises a mixture of branched-chain organopolysiloxanes of at least two types that contain alkenyl groups bonded only to the molecular terminals.
6. The sealant or filler for electrical and electronic components according to claim 2 , wherein component (a) is a linear-chain organopolysiloxane that contains alkenyl groups bonded to both molecular terminals and to side molecular chains.
7. The sealant or filler for electrical and electronic components according to claim 6 , wherein component (b) is a linear-chain organopolysiloxane having silicon-bonded hydrogen atoms only at both molecular terminals.
8. The sealant or filler for electrical and electronic components according to claim 2 , wherein component (b) is a linear-chain organopolysiloxane having silicon-bonded hydrogen atoms only at both molecular terminals.
9. An electrical or electronic component, which is sealed or filled at room temperature with the sealant or filler for electrical and electronic components according to claim 1 .
10. The sealant or filler for electrical and electronic components according to claim 1 , wherein the initial viscosity of the sealant or filler is from 10 mPa·s to 15,000 mPa·s.
11. The sealant or filler for electrical and electronic components according to claim 1 , wherein the initial viscosity of the sealant or filler is from 50 mPa·s to 10,000 mPa·s.
12. The sealant or filler for electrical and electronic components according to claim 1 , wherein the initial viscosity of the sealant or filler does not exceed 2,000 mPa·s.