Curable composition and fluorinated cured product
View Patent ↗The present invention provides a curable composition which can yield a fluorinated cured product excellent in transparency, light resistance, heat resistance, and mechanical strength, and minimally damaged by stress concentration. The invention relates to a curable composition comprising a perfluoro polymer (a) containing a unit derived from a perfluorodiene having two polymerizable carbon-carbon double bonds, wherein two carbon atoms in one carbon-carbon double bond form the main chain, and the other carbon-carbon double bond forms a side chain; a perfluorocyclic monoene (b) having at least 8 carbon atoms, which has an alicyclic structure made of carbon atoms and optionally containing an oxygen atom, and one polymerizable carbon-carbon double bond, wherein at least one of two carbon atoms forming the carbon-carbon double bond is a carbon atom constituting the alicyclic structure; and a polymerization initiator (i).
1. A curable composition comprising a perfluoro polymer (a) containing a unit derived from a perfluorodiene having two polymerizable carbon-carbon double bonds, wherein two carbon atoms in one carbon-carbon double bond form the main chain, and the other carbon-carbon double bond forms a side chain; a perfluorocyclic monoene (b) having at least 8 carbon atoms, which has an alicyclic structure made of carbon atoms and optionally containing an oxygen atom, and one polymerizable carbon-carbon double bond, wherein at least one of two carbon atoms forming the carbon-carbon double bond is a carbon atom constituting the alicyclic structure; and a polymerization initiator (i).
2. The curable composition according to claim 1 , which further contains a perfluorocyclic polyene (c) which has an alicyclic structure made of carbon atoms and optionally containing an oxygen atom, and at least two polymerizable carbon-carbon double bonds, wherein at least one of two carbon atoms forming at least one carbon-carbon double bond is a carbon atom constituting the alicyclic structure.
3. The curable composition according to claim 1 , wherein the perfluoro polymer (a) has a content of the double bonds being from 0.1 to 2 mmol/g.
4. The curable composition according to claim 1 , wherein the perfluoro polymer (a) has a mass average molecular weight of from 1,000 to 10,000.
5. The curable composition according to claim 1 , wherein the perfluoro polymer (a) is a polymer further containing a unit derived from tetrafluoroethylene.
6. The curable composition according to claim 1 , wherein the perfluorocyclic monoene (b) has an alicyclic structure made of a 5-membered ring or a 6-membered ring containing 1 or 2 oxygen atoms, wherein a carbon-carbon double bond is present between two adjacent carbon atoms constituting the alicyclic structure, or the carbon-carbon double bond is present between one carbon atom constituting the alicyclic structure and a carbon atom outside of the alicyclic structure.
7. A fluorinated cured product obtained by curing the curable composition as defined in claim 1 .
8. An optical material made of the fluorinated cured product as defined in claim 7 .
9. A light-emitting device which is encapsulated in a light-transmitting manner with the fluorinated cured product as defined in claim 7 .
10. A curable composition comprising a perfluoro polymer (a) containing a unit derived from a perfluorodiene having two polymerizable carbon-carbon double bonds, wherein two carbon atoms in one carbon-carbon double bond form the main chain, and the other carbon-carbon double bond forms a side chain; a perfluorocyclic polyene (c) which has an alicyclic structure made of carbon atoms and optionally containing an oxygen atom, and at least two polymerizable carbon-carbon double bonds, wherein at least one of two carbon atoms forming at least one carbon-carbon double bond is a carbon atom constituting the alicyclic structure; and a polymerization initiator (i).
11. The curable composition according to claim 10 , wherein the perfluoro polymer (a) has a content of the double bonds being from 0.1 to 2 mmol/g.
12. The curable composition according to claim 10 , wherein the perfluoro polymer (a) has a mass average molecular weight of from 1,000 to 10,000.
13. The curable composition according to claim 10 , wherein the perfluoro polymer (a) is a polymer further containing a unit derived from tetrafluoroethylene.
14. The curable composition according to claim 10 , wherein the perfluorocyclic polyene (c) has an alicyclic structure made of a 5-membered ring or a 6-membered ring containing 1 or 2 oxygen atoms, wherein a carbon-carbon double bond is present between two adjacent carbon atoms constituting the alicyclic structure, or the carbon-carbon double bond is present between one carbon atom constituting the alicyclic structure and a carbon atom outside of the alicyclic structure, and the polyene (c) has two such alicyclic structures wherein the carbon-carbon double bond is present.
15. A fluorinated cured product obtained by curing the curable composition as defined in claim 10 .
16. An optical material made of the fluorinated cured product as defined in claim 15 .
17. A light-emitting device which is encapsulated in a light-transmitting manner with the fluorinated cured product as defined in claim 15 .