Organopolysiloxane composition

Patent metadata

Field	Value
Publication number	US-11299628-B2
Application number	US-201816764198-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Nov 15, 2017
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

Provided is an organopolysiloxane composition, comprising: (A) an organopolysiloxane having at least two silicon atom-bonded alkenyl groups in each molecule, (B) an organohydrogenpolysiloxane having at least two silicon atom-bonded hydrogen atoms in each molecule, (C) a platinum catalyst, and (D) a specific isocyanide compound.

First claim

The invention claimed is:

1. An organopolysiloxane composition comprising:
(A) an organopolysiloxane having at least two silicon-bonded alkenyl groups per molecule,
(B) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule,
(C) a platinum hydrosilylation catalyst, and
(D) a compound having the formula (1-1) or (1-2):
R 1 —Si(R 1 ) a {[X—Si(R 1 ) 2 ] b —R 1 } c   (1-1)

R 1 —Si(R 1 ) a {(Z i )} c   (1-2)

wherein R 1 is each independently a monovalent organic group selected from an optionally substituted C 1 -C 30 monovalent organic group which may be separated by at least one atom selected from oxygen, nitrogen, sulfur and phosphorus, and an organic group having the formula (2):
—Y—NC  (2)

wherein Y is an optionally substituted C 1 -C 30 divalent organic group which may be separated by at least one atom selected from oxygen, nitrogen, sulfur and phosphorus, one to three of all groups R 1 being an organic group of formula (2),
X is each independently an oxygen atom, or an optionally substituted C 1 -C 30 divalent organic group which may be separated by at least one atom selected from oxygen, nitrogen, sulfur and phosphorus,
a is an integer of 0 to 3, c is an integer of 0 to 3, a+c is 3, b is an integer of 1 to 300,
Z i is a group of the formula:
—X—Si(R 1 ) j (Z i+1 ) (3−j)

wherein i indicative of a hierarchy is an integer of 1 to 10, j is an integer of 0 to 3, j associated with at least one of all hierarchies is 0 or 1, the lowest hierarchy is j=3, or
a cyclic polysiloxane compound in which a cyclic structure is formed of repeating unit of —OSi(R 1 ) 2 —, wherein R 1 is as defined above.

2. The organopolysiloxane composition of claim 1 wherein component (A) is an organopolysiloxane having the average compositional formula (3):
R 2 d R 3 e SiO (4−d−e)/2   (3)

wherein R 2 is each independently an alkenyl group, R 3 is each independently a silicon-bonded organic group other than the alkenyl group, d and e are numbers in the range: 0<d≤3, 0≤e<3, and 0<d+e≤3, and selected such that at least two alkenyl groups R 2 are contained per molecule, and
component (B) is an organohydrogenpolysiloxane having the average compositional formula (4):
R 4 g H h SiO (4−g−h)/2   (4)

wherein R 4 is each independently an organic group other than silicon-bonded hydrogen, g and h are numbers in the range: 0<g<3, 0<h<3, and 0<g+h≤3, and selected such that at least two silicon-bonded hydrogen atoms are contained per molecule.

3. The organopolysiloxane composition of claim 1 wherein in formula (1-1), a is 0, 1 or 2.

4. The organopolysiloxane composition of claim 1 wherein in formula (1-1) or (1-2), or the repeating unit of —OSi(R 1 ) 2 — of the cyclic polysiloxane compound, one of all groups R 1 is an organic group of formula (2).

5. The organopolysiloxane composition of claim 1 wherein in formula (1-1) or (1-2), X is oxygen.

6. The organopolysiloxane composition of claim 1 wherein in formula (2), Y is a C 1 -C 30 divalent hydrocarbon group.

7. The organopolysiloxane composition of claim 1 wherein component (D) is present in an amount to give 2 to 20 equivalents of the group of formula (2) per platinum atom in component (C).

8. The organopolysiloxane composition of claim 1 wherein in formula (1-1) or (1-2), or the repeating unit of —OSi(R 1 ) 2 — of the cyclic polysiloxane compound, R 1 is each independently a monovalent organic group selected from C 1 -C 30 alkyl groups, C 2 -C 20 alkenyl groups, C 2 -C 20 alkynyl groups, C 6 -C 30 aryl groups, C 7 -C 30 aralkyl groups, C 1 -C 30 alkoxy groups and an organic group having the formula (2):
—Y—NC  (2)

wherein Y is a C 1 -C 30 alkylene group which may be straight, branched or cyclic, a C 6 -C 30 arylene group, or a C 7 -C 30 aralkylene group.

9. The organopolysiloxane composition of claim 1 wherein in formula (1-1), X is each independently an oxygen atom, a C 1 -C 30 alkylene group, a C 6 -C 30 arylene group, or a C 7 -C 30 aralkylene group.

Assignees

• Shinetsu Chemical Co

Inventors

• Noda Daisuke
• Sakuta Koji

Classifications

• C08G77/20 Primary

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08G77/12

  containing silicon bound to hydrogen · CPC title

• C08G77/08

  characterised by the catalysts used · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L83/04 Primary

  Polysiloxanes · CPC title