Curable composition including siloxane oligomer and inorganic fine particles

Patent metadata

Field	Value
Publication number	US-10125267-B2
Application number	US-201414785436-A
Country	US
Kind code	B2
Filing date	Apr 16, 2014
Priority date	Apr 17, 2013
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A material having a low refractive index that exhibits sufficiently low refractive index without deteriorating the strength of cured film produced therefrom, that can be cured by an active energy ray that is applicable for a resin base material that is not desired to be exposed to heat. Curable composition including: siloxane oligomer (a) containing a radically polymerizable double bond obtained through hydrolysis and condensation of alkoxysilanes containing at least an alkoxysilane A of Formula [1] and alkoxysilane B of Formula [2] in an amount of 100 parts by mass; inorganic fine particles (b) in amount of 10 parts by mass to 1,000 parts by mass; polymerization initiator (c) generating a radical upon active energy ray irradiation in an amount of 0.1 parts by mass to 25 parts by mass

R 1 a Si(OR 2 ) 4-a   [1]

R 3 b Si(OR 4 ) 4-b   [2]

a cured film produced from the composition, and a laminate including a low refractive index layer produced from the composition.

First claim

The invention claimed is:

1. A curable composition comprising:
a siloxane oligomer (a) containing a radically polymerizable double bond obtained through hydrolysis and condensation of alkoxysilanes containing at least an alkoxysilane A and an alkoxysilane B in an amount of 100 parts by mass;
inorganic fine particles (b) in an amount of 10 parts by mass to 1,000 parts by mass; and
a polymerization initiator (c) generating a radical upon active energy ray irradiation in an amount of 0.1 parts by mass to 25 parts by mass; wherein the alkoxysilane A is a compound of Formula [1] and the alkoxysilane B is a compound of Formula [2]:
R 1 a Si(OR 2 ) 4-a   [1]

R 3 b Si(OR 4 ) 4-b   [2]

where
R 1 is a monovalent organic group containing a radically polymerizable double bond;
R 3 is a phenyl group, or a C 1-10 alkyl group, wherein the alkyl group is unsubstituted or substituted with
an amino group substituted with at least a C 1-6 alkyl group,
an amino group substituted with at least a phenyl group, or
a ureido group;

R 2 and R 4 each are independently a methyl group or an ethyl group;
a is 1 or 2; and
b is an integer of 0 to 2; wherein
the inorganic fine particles (b) are elongated-shaped silica fine particles having
an average length of 30 nm to 500 nm, where the average length is determined by measuring by a dynamic light scattering method, and
an average particle diameter of 1 nm to 25 nm, where the average particle diameter is determined from a specific surface area measured by a nitrogen adsorption method, the nitrogen adsorption method being a BET method, in accordance with the expression of:
Average particle diameter=2720/Specific surface area in m 2 .

2. A curable composition comprising:
a siloxane oligomer (a) containing a radically polymerizable double bond obtained through hydrolysis and condensation of alkoxysilanes containing at least an alkoxysilane A and an alkoxysilane B in an amount of 100 parts by mass;
inorganic fine particles (b) in an amount of 10 parts by mass to 1,000 parts by mass;
a base generator (g) in an amount of 0.001 mol % to 20 mol % relative to 1 mol of alkoxysilyl group of the siloxane oligomer (a); and
a polymerization initiator (c) generating a radical upon active energy ray irradiation in an amount of 0.1 parts by mass to 25 parts by mass; wherein the alkoxysilane A is a compound of Formula [1] and the alkoxysilane B is a compound of Formula [2]:
R 1 a Si(OR 2 ) 4-a   [1]

R 3 b Si(OR 4 ) 4-b   [2]

where
R 1 is a monovalent organic group containing a radically polymerizable double bond;
R 3 is a phenyl group, or a C 1-10 alkyl group, wherein the alkyl group is optionally substituted with
a fluorine atom,
an amino group substituted with at least a C 1-6 alkyl group,
an amino group substituted with at least a phenyl group, or
a ureido group;

R 2 and R 4 each are independently a methyl group or an ethyl group;
a is 1 or 2; and
b is an integer of 0 to 2.

3. The curable composition according to claim 1 , wherein R 1 of the Formula [1] is a monovalent organic group containing a vinyl group or a (meth)acrylic group.

4. The curable composition according to claim 3 , wherein the alkoxysilane A is a compound of Formula [3]:

where
R 2 is defined the same as in Formula [1],
R 5 is a hydrogen atom or a methyl group, and
L 1 is a C 1-10 alkylene group.

5. The curable composition according to claim 3 , wherein the alkoxysilane A is a compound of Formula [3]:

where
R 2 is defined the same as in Formula [1],
R 5 is a hydrogen atom or a methyl group, and
L 1 is a C 1-6 alkylene group.

6. The curable composition according to claim 1 , wherein the polymerization initiator (c) generating a radical upon the active energy ray irradiation is an alkylphenone compound.

7. The curable composition according to claim 1 , further comprising: a surface modifier (d) containing a perfluoropolyether compound in an amount of 0.01 parts by mass to 50 parts by mass.

8. The curable composition according to claim 1 , further comprising: an active energy ray-curable multifunctional monomer (e) in an amount of 1 part by mass to 300 parts by mass.

9. The curable composition according to claim 2 , wherein the siloxane oligomer (a) is a siloxane oligomer containing a radically polymerizable double bond obtained through hydrolysis and condensation of the alkoxysilane A of Formula [1] and the alkoxysilane B of Formula [2]
R 1 a Si(OR 2 ) 4-a   [1]

R 3 b Si(OR 4 ) 4-b   [2]

in which
R 1 is a monovalent organic group containing a radically polymerizable double bond;
R 3 is a phenyl group, or a C 1-6 alkyl group that is optionally substituted with a fluorine atom;
R 2 and R 4 each are independently a methyl group or an ethyl group;
a is 1 or 2; and
b is an integer of 0 to 2.

10. The curable composition according to claim 1 , wherein the siloxane oligomer (a) containing the radically polymerizable double bond is a siloxane oligomer containing 10 mol % to 99 mol % of the alkoxysilane A unit.

11. A cured film obtained from the curable composition as claimed in claim 1 .

12. A laminate comprising a low refractive index layer, wherein
the low refractive index layer is obtained by a step of forming a layer made from the curable composition as claimed in claim 1 and a step of irradiating the layer with an active energy ray for curing.

13. A laminate comprising a low refractive index layer on at least one side of a base material layer, wherein
the low refractive index layer is obtained by a step of forming a layer made from the curable composition as claimed in claim 1 on at least one side of the base material layer and a step of irradiating the layer with an active energy ray for curing.

14. The curable composition according to claim 1 , wherein R 3 is a C 1-10 alkyl group, wherein the alkyl group is unsubstituted or substituted with
an amino group substituted with at least a C 1-6 alkyl group,
an amino group substituted with at least a phenyl group, or
a ureido group.

15. The curable composition according to claim 1 , wherein R 3 is a C 1-10 alkyl group, wherein the alkyl group is substituted with
an amino group substituted with at least a C 1-6 alkyl group,
an amino group substituted with at least a phenyl group, or
a ureido group.

16. The curable composition according to claim 1 , wherein the amount of the inorganic fine particles (b) is in a range of from 233 parts by mass to 1,000 parts by mass.

17. The curable composition according to claim 1 , further comprising: a base generator (g) in an amount of 0.001 mol % to 20 mol % relative to 1 mol of alkoxysilyl group of the siloxane oligomer (a).

18. The curable composition according to claim 2 , wherein R 1 of the Formula [1] is a monovalent organic group containing a vinyl group or a (meth)acrylic group.

19. The curable composition according to claim 2 , wherein the alkoxysilane A is a compound of Formula [3]:

where
R 2 is defined the same as in Formula [1],
R 5 is a hydrogen atom or a methyl group, and
L 1 is a C 1-10 alkylene group.

20. The curable composition accordin

Assignees

• Nissan Chemical Ind Ltd

Inventors

• Tamura Hiroyasu
• Haraguchi Masayuki

Classifications

• C08F299/08

  from polysiloxanes · CPC title

• C09D183/06

  containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence) · CPC title

• B32B27/08

  of synthetic resin · CPC title

• C09D183/08

  containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen · CPC title

• G02B1/113

  using inorganic layer materials only · CPC title