Dual cure organopolysiloxane composition

Patent metadata

Field	Value
Publication number	US-10947385-B2
Application number	US-201816496520-A
Country	US
Kind code	B2
Filing date	May 30, 2018
Priority date	Jun 30, 2017
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

The present invention relates to organopolysiloxane compositions which exhibits both UV and moisture initiated curing.

First claim

What is claimed is:

1. A dual cure organopolysiloxane composition, comprising:
(A) A first organopolysiloxane having at least two mercapto functional groups and that is free of terminal mercapto groups; and
(B) A second organopolysiloxane having at least one alkenyl group and at least one trialkoxysilyl group.

2. The composition of claim 1 wherein the first organopolysiloxane comprises at least one unit of the formula:
(HSR a )R b SiO 3-c/2

wherein Ra represents a divalent hydrocarbon group, Rb represents alkyl, aryl, H, hydroxyl or alkoxy containing group; c is 0, 1 or 2.

3. The composition of claim 2 wherein the SH content is 0.5-35 weight percent based on first organopolysiloxane weight.

4. The composition of claim 2 wherein Ra is divalent hydrocarbon group with 1-8 carbons, Rb is a C 1-8 group or phenyl moiety or alkoxy moiety.

5. The composition according to claim 1 wherein first organopolysiloxane is present in the dual cure organopolysiloxane composition in an amount from 1 to 90 weight percent.

6. The composition of claim 1 wherein the second organopolysiloxane is represented by the following formula:
M a D b T c Q d

wherein M=R 1 R 2 R 3 SiO 1/2 ; D=R 4 R 5 SiO 2/2 ; T=R 6 SiO 3/2 ; Q=SiO 4/2 ; further wherein R 1 to R 6 independently alkyl, aryl, H, hydroxyl, alkoxy, alkenyl containing groups; wherein at least one R 1 to R 6 is trialkoxysilyl containing group and at least one R 1 to R 6 is alkenyl containing group; and a+b+c+d=1.

7. The composition according to claim 1 , wherein the second organopolysiloxane is present in amounts of 2% to 90% by weight of the composition.

8. The composition according to claim 1 , further comprising a photoinitiator.

9. The composition according to claim 8 , further comprising a moisture cure catalyst.

10. The composition according to claim 1 , further comprising a moisture cure catalyst.

Assignees

• Dow Silicones Corp

Inventors

• Liu Junying
• Larson Kent
• Mcdonald Joel

Classifications

• C08G77/28

  sulfur-containing groups · CPC title

• C08L83/08 Primary

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

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08G77/18 Primary

  to alkoxy or aryloxy groups · CPC title

• C09J183/08

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