Composition for use as material for electrical or electronic parts, and cured product thereof

1. A composition for use as material for electrical or electronic parts, comprising:

(A) a vinyl polymer having, at a molecular terminal thereof, at least one (meth)acryloyl group per molecule of the polymer, the group being represented by the following general formula (1):

—OC(O)C(R a )═CH 2   (1)

wherein R a represents a hydrogen atom or an organic group having 1 to 20 carbon atoms,

(B) is at least one compound selected from the group consisting of the following compounds:

triethylene glycol di(meth)acrylate,

dipropylene glycol di(meth)acrylate,

3-methyl-1,5-pentadiol di(meth)acrylate,

1,6-hexanediol di(meth)acrylate,

1,7-heptanediol di(meth)acrylate,

1,8-octanediol di(meth)acrylate,

2-methyl-1,8-octanediol di(meth)acrylate,

1,9-nonanediol di(meth)acrylate,

1,10-decanediol di(meth)acrylate,

CH 2 ═CHC(O)O—(CH 2 ) n —OC(O)CH═CH 2 , wherein n is an integer of 6 to 20,

CH 2 ═C(CH 3 )C(O)O—(CH 2 ) n —OC(O)C(CH 3 )═CH 2 , wherein n is an integer of 6 to 20,

CH 2 ═CHC(O)O—(CH 2 CH 2 O) n —OC(O)CH═CH 2 , wherein n is an integer of 3 to 10,

CH 2 ═C(CH 3 )C(O)O—(CH 2 CH 2 O) n —OC(O)C(CH 3 )═CH 2 , wherein n is an integer of 3 to 10,

3-methyl-1,5-pentanediol di(meth)acrylate,

1,9-nonanediol di(meth)acrylate,

cyclohexanedimethanol di(meth)acrylate,

dimethylol-tricyclodecane di(meth)acrylate,

1,3-adamantanedimethanol di(meth)acrylate,

1,9-nonanediol diacrylate,

1,10-decanediol diacrylate, and

dimethylol-tricyclodecane diacrylate

trimethylolpropane tri(meth)acrylate,

pentaerythritol tetra(meth)acrylate,

di(trimethylolpropane) tetra(meth)acrylate,

dipentaerythritol penta(meth)acrylate, and

dipentaerythritol hexa(meth)acrylate,

(D) a vinyl monomer having a (meth)acryloyl group represented by the following general formula (3):

R c —OC(O)C(R a )═CH 2   (3)

wherein R a represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, and R c represents an organic group having 6 to 20 carbon atoms, and

(C) an initiator,

wherein the total amount of the components (B) and (D) is from 25% by weight or more to 65% by weight or less to the total 100% by weight of the components (A), (B) and (D), and the component (B) is comprised in an amount of 5% by weight or more.

2. The composition for use as material for electrical or electronic parts according to claim 1 , wherein the total amount of the components (B) and (D) is from 30% by weight or more to 55% by weight or less to the total 100% by weight of the components (A), (B) and (D), and the component (B) is comprised in an amount of 15% by weight or more.

3. The composition for use as material for electrical or electronic parts according to claim 1 , wherein the amount of the component (C) is from 0.001 to 10 parts by weight to 100 parts by weight of the total of the components (A), (B) and (D).

4. The composition for use as material for electrical or electronic parts according to claim 1 , wherein a main chain of the component (A) is produced by polymerizing acrylic ester monomers.

5. The composition for use as material for electrical or electronic parts according to claim 1 , wherein the main chain of the component (A) is produced by living radical polymerization.

6. The composition for use as material for electrical or electronic parts according to claim 5 , wherein the main chain of the component (A) is produced by atom transfer radical polymerization.

7. The composition for use as material for electrical or electronic parts according to claim 1 , wherein the main chain of the component (A) is produced by polymerizing vinyl monomers, using a chain transfer agent.

8. The composition for use as material for electrical or electronic parts according to claim 1 , wherein the number-average molecular weight of the component (A) is 3000 or more.

9. The composition for use as material for electrical or electronic parts according to claim 1 , wherein about the vinyl polymer of the component (A), the ratio between the weight-average molecular weight thereof and the number-average molecular weight thereof is less than 1.8, these molecular weights being measured by gel permeation chromatography.

10. The composition for use as material for electrical or electronic parts according to claim 1 , wherein the component (B) is a vinyl monomer having two (meth)acryloyl groups per molecule of the monomer.

11. The composition for use as material for electrical or electronic parts according to claim 1 , wherein the component (C) is an optical radical initiator.

12. The composition for use as material for electrical or electronic parts according to claim 1 , which comes into contact with an electrode metal.

13. An electrical or electronic part material obtained by curing the composition for use as material for electrical or electronic parts recited in claim 1 .

14. A cured product obtained by curing the composition for use as material for electrical or electronic parts recited in claim 1 by an active energy ray or heat.