Curable silicone composition and cured product of same

Patent metadata

Field	Value
Publication number	US-12415923-B2
Application number	US-202118018996-A
Country	US
Kind code	B2
Filing date	Jun 21, 2021
Priority date	Aug 6, 2020
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

This disclosure relates to a curable silicone composition that contains little to no solvent, has excellent transparency and adhesion to a substrate, and has a low overall haze value, and also relates to a cured product thereof. The curable silicone composition comprises: 100 mass parts of (A) a chain organopolysiloxane having an aliphatic unsaturated carbon-carbon bond-containing group and a degree of siloxane polymerization (DP) within a range of 10 to 1000; 1 to 100 mass parts of (B) a chain organopolysiloxane having an aliphatic unsaturated carbon-carbon bond-containing group and having a DP within a range of 1001 to 10,000; 0 to 100 mass parts of (C) an organopolysiloxane resin; (D) a polyorganohydrogen siloxane; and (E) a catalytic amount of a hydrosilylation reaction catalyst. Optionally, the composition further comprises: 0 to 60 mass parts of (F) an organic solvent, for 100 mass parts of the sum of components (A) to (D).

First claim

The invention claimed is:

1. A curable silicone composition, comprising:
100 mass parts of (A) a straight chain or branched chain organopolysiloxane having at least two aliphatic unsaturated carbon-carbon bond-containing groups in a molecule and a degree of siloxane polymerization within a range of 10 to 1000;
1 to 100 mass parts of (B) a straight chain or branched chain organopolysiloxane having at least two aliphatic unsaturated carbon-carbon bond-containing groups in a molecule and having a degree of siloxane polymerization within a range of 1001 to 10,000 for 100 mass parts of component (A);
0 to 100 mass parts of (C) an organopolysiloxane resin, containing in a molecule, siloxane units expressed by R 3 SiO 1/2 where R mutually independently represents a monosaturated organic group and siloxane units expressed by SiO 4/2 , for 100 mass part of component (A);
(D) a polyorganohydrogen siloxane; and
(E) a catalytic amount of a hydrosilylation reaction catalyst;

and optionally, further comprising:
0 to 60 mass parts of (F) an organic solvent, for 100 mass parts of the sum of components (A) to (D);

wherein component (A) is a mixture of:
(A1) a straight chain or branched chain organopolysiloxane having at least two aliphatic unsaturated carbon-carbon bond-containing groups only at both ends of the molecular chain and a degree of siloxane polymerization in a range of 10 to 1000; and
(A2) a straight chain or branched chain organopolysiloxane having at least one or more aliphatic unsaturated carbon-carbon bond-containing groups at locations other than the terminals of the molecular chain and having at least three or more aliphatic unsaturated carbon-carbon bond-containing groups in a molecule, and a degree of siloxane polymerization in a range of 10 to 1000;
at a (A1):(A2) mass ratio of 30:70 to 70:30.

2. The curable silicone composition according to claim 1 , wherein the amount of aryl or aralkyl groups bonded to silicon atoms in the molecule of components (A) and (B) is less than 0.1 mol % of the total number of groups bonded to silicon atoms in these components.

3. The curable silicone composition according to claim 1 , wherein component (C) is present and is an organopolysiloxane resin with a mass average molecular weight in a range of 1,000 to 10,000, and the amount of the organopolysiloxane resin with a molecular weight of 100,000 or more is 1% by mass or less of the total.

4. The curable silicone composition according to claim 1 , wherein the average number of siloxane units between two aliphatic unsaturated carbon-carbon bond-containing groups in component (A2) is from 30 to 200.

5. The curable silicone composition according to claim 1 , wherein component (D) is a straight chain or branched chain organohydrogen polysiloxane having at least one or more silicon atom-bonded hydrogen atoms at locations other than the terminals of the molecular chain, and the ratio of the number of moles of silicon atom-bonded hydrogen atoms in component (D) to the number of moles of aliphatic unsaturated carbon-carbon bond-containing groups in component (A) and component (B) is within a range of 0.1 to 40.

6. The curable silicone composition according to claim 1 , wherein the total haze value of a cured film is 2.0 or less when the curable silicone composition is cured on a PET film to form a cured film with a thickness of 75 μm.

7. A silicone cured product, obtained by curing the curable silicone composition according to claim 1 .

8. The curable silicone composition according to claim 1 , wherein component (C) is present.

9. The curable silicone composition according to claim 8 , wherein component (F) is present.

10. The curable silicone composition according to claim 1 , wherein component (F) is present.

11. A curable silicone composition, comprising:
(A) a straight chain or branched chain organopolysiloxane having at least two aliphatic unsaturated carbon-carbon bond-containing groups in a molecule and a degree of siloxane polymerization within a range of 10 to 1000;
(B) a straight chain or branched chain organopolysiloxane having at least two aliphatic unsaturated carbon-carbon bond-containing groups in a molecule and having a degree of siloxane polymerization within a range of 1001 to 10,000 for 100 mass parts of component (A);
(C) an organopolysiloxane resin, containing in a molecule, siloxane units expressed by R 3 SiO 1/2 where R mutually independently represents a monosaturated organic group and siloxane units expressed by SiO 4/2 , for 100 mass part of component (A);
(D) a polyorganohydrogen siloxane; and
(E) a catalytic amount of a hydrosilylation reaction catalyst;

and optionally, further comprising:
(F) an organic solvent, for 100 mass parts of the sum of components (A)to (D);
wherein when the total amount of components (A) and (B) is 100 mass parts;
the total amount of components (A) and (B) is within a range of 65 to 99 mass parts;
the amount of component (C) is within a range of 0 to 40 mass parts;
the amount of component (D) is within a range of 0.01 to 15 mass parts; and
the amount of component (F) is within a range of 0 to 25 mass parts.

12. The curable silicone composition according to claim 11 , wherein the amount of aryl or aralkyl groups bonded to silicon atoms in the molecule of components (A) and (B) is less than 0.1 mol % of the total number of groups bonded to silicon atoms in these components.

13. The curable silicone composition according to claim 11 , wherein component (C) is present and is an organopolysiloxane resin with a mass average molecular weight in a range of 1,000 to 10,000, and the amount of the organopolysiloxane resin with a molecular weight of 100,000 or more is 1% by mass or less of the total.

14. The curable silicone composition according to claim 11 , wherein component (A) is a mixture of:
(A1) a straight chain or branched chain organopolysiloxane having at least two aliphatic unsaturated carbon-carbon bond-containing groups only at both ends of the molecular chain and a degree of siloxane polymerization in range of 10 to 1000; and
(A2) a straight chain or branched chain organopolysiloxane having at least one or more aliphatic unsaturated carbon-carbon bond-containing groups at locations other that the terminals of the molecular chain and having at least three or more aliphatic unsaturated carbon-carbon bond-containing groups in a molecule, and a degree of siloxane polymerization in a range of 10 to 1000;

at a (A1):(A2) mass ration of 30:70 to 70:30.

15. The curable silicone composition according to claim 14 , wherein the average number of siloxane units between two aliphatic unsaturated carbon-carbon bond-containing groups in component (A2) is from 30 to 200.

16. The curable silicone composition according to claim 11 , wherein component (D) is a straight chain or branched chain organohydrogen polysiloxane having at least one or more silicon atom-bonded hydrogen atoms at locations other that the terminals of the molecular chain, and the ratio of the number of moles of silicon atom-bonded hydrogen atoms in component (D) to the number of moles of aliphatic unsaturated carbon-carbon bond-containing groups in component (A) and component (B) is within a range of 0.01 to 40.

17. The curable silicone composition according to claim 11 , wherein the total haze value of a cured film is 2.0 or less when the curable silicone composition is cured on a PET film to form a cured film with a thickness of 75 μm.

18. A silicone cured product, obtained by curing the curable silicone composition

Assignees

• Dow Toray Co Ltd
• Dow Tray Co Ltd

Inventors

• Iimura Tomohiro
• Hino Takakazu
• Furukawa Haruhiko

Classifications

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08G77/12

  containing silicon bound to hydrogen · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08L83/04 Primary

  Polysiloxanes · CPC title