Silicone sealer compositions

Patent metadata

Field	Value
Publication number	US-2021284841-A1
Application number	US-201817259015-A
Country	US
Kind code	A1
Filing date	Aug 15, 2018
Priority date	Aug 15, 2018
Publication date	Sep 16, 2021
Grant date	—

Abstract

Disclosed is a curable composition and cured products thereof. The curable composition includes a vinyl polysiloxane component, a hydrogen polysiloxane component, a polymerization catalyst, and an expandable graphite component comprising moisture. Cured products of the curable composition include foamed cells having a uniform size and distribution in the cured product. This can help to increase the water proofing and flame retardant properties of the cured product.

First claim

1 . A curable silicone composition comprising:
a vinyl polysiloxane component; a hydrogen polysiloxane component; a polymerization catalyst; and an expandable graphite component comprising moisture.

2 . The curable silicone composition of claim 2 , wherein the vinyl polysiloxane component comprises a vinyl polysiloxane having a structure according to Formula I:

wherein
R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , le, R 9 , and R 10 , are independently chosen from —H, —OH, and substituted or unsubstituted (C 1 -C 20 )hydrocarbyl;
at least one of R 1 , R 4 , R 5 , and R 10 , comprises a vinyl group;
m is any positive integer;
n is zero or any positive integer; and
m and n are in random or block orientation.

3 . The curable silicone composition of claim 1 , wherein the vinyl polysiloxane component comprises one or more vinyl polysiloxanes independently having a structure according to at least one of Formula II and Formula III:

4 . The curable silicone composition of claim 1 , wherein the vinyl polysiloxane component comprises one or more vinyl polysiloxanes independently having viscosity in a range of from about 100 mPa-s to about 500,000 mPa-s at 25° C.

5 . The curable silicone composition of claim 1 , wherein the hydrogen polysiloxane component comprises a hydrogen polysiloxane polymer having a structure according to Formula VI:

wherein R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , R 18 , R 19 , and R 20 are independently chosen from —H, —OH, substituted or unsubstituted (C 1 -C 20 )hydrocarbyl and at least one of R 11 , R 14 , R 15 , and R 20 , is —H;
p is any positive integer;
q is zero or any positive integer; and
p and q are in random or block orientation.

6 . The curable silicone composition of claim 5 , wherein the hydrogen polysiloxane component comprises one or more hydrogen polysiloxane polymers independently having a structure according to at least one of Formula VII and Formula VIII:

7 . The curable silicone composition of claim 1 , wherein the polymerization catalyst comprises platinum.

8 . The curable silicone composition of any onc of claim 1 , wherein the expandable graphite component comprises a plurality of graphite flakes independently having a moisture content in a range of from about 0.05 wt % to about 5 wt % per graphite flake.

9 . The curable silicone composition of any onc of claim 1 , further comprising a microsphere component in a range of from about 0.05 wt % to about 10 wt % of the curable composition.

10 . The curable silicone composition of claim 9 , wherein the microsphere component comprises a plurality of microspheres chosen from polymer microspheres, glass microspheres, ceramic microspheres, or combinations thereof.

11 . An assembly comprising:
a first substrate; a second substrate; and a cured product of the curable composition of claim 1 , in contact with the first substrate and the second substrate.

12 . The assembly of claim 11 , wherein the first substrate and the second substrate enclose a void defined therebetween.

13 . The assembly of claim 12 , further comprising an electronic component located at least partially within the void.

14 . The assembly of claim 11 , wherein the cured product comprises a plurality of foamed cells dispersed throughout the cured product.

15 . The assembly of claim 14 , wherein the plurality of foamed cells are uniformly dispersed throughout the cured product.

Assignees

• 3M Innovative Properties Co

Inventors

• Zhang Enzhong
• Chen Lianzhou
• Sun Shaomin
• Sun Xinxin
• Gu Shaoqing
• Tang Jianhua
• Zook Jonathan D

Classifications

• C08L83/04 Primary

  Polysiloxanes · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08K7/20

  Glass · CPC title

• C08G77/12

  containing silicon bound to hydrogen · CPC title

• C08L2205/18

  Spheres · CPC title