Silsesquioxane polymers, compositions, and articles

Patent metadata

Field	Value
Publication number	US-10858516-B2
Application number	US-201816643727-A
Country	US
Kind code	B2
Filing date	Sep 13, 2018
Priority date	Sep 22, 2017
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A silsesquixane polymer, a composition including such silsesquixane polymer, and an article including such polymer or composition, wherein the composition includes a silsesquioxane polymer and a free siloxane; wherein the silsesquioxane polymer includes a three-dimensional network of Formula (I): wherein: each R 1 and R 2 is independently a (C1-C4)alkyl; each L 1 is independently a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof; each R 3 is independently a linear (C14-C100)alkyl; with the proviso that L 1 is selected such that each Si atom is directly bonded to an alkylene or an alkyl; m is an integer of at least 2; n is an integer of at least 1; m+n is an integer of at least 10; each oxygen atom at an asterisk (*) is bonded to another Si atom within the three-dimensional network; and the silsesquioxane polymer is a solid at 25° C.

First claim

What is claimed is:

1. A silsesquioxane polymer comprising a three-dimensional branched network of Formula (I):

wherein
each R 1 and R 2 is independently a (C1-C4)alkyl;
each L 1 is independently a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof;
each R 3 is independently a linear (C14-C100)alkyl;
with the proviso that L 1 is selected such that each Si atom is directly bonded to an alkylene or an alkyl;
m is an integer of at least 2;
n is an integer of at least 1;
m+n is an integer of at least 10;
each oxygen atom at an asterisk (*) is bonded to another Si atom within the three-dimensional network; and
the silsesquioxane polymer is a solid at 25° C.

2. The silsesquioxane polymer of claim 1 wherein, in Formula (I), m÷(m+n) is up to 0.80.

3. The silsesquioxane polymer of claim 1 wherein, in Formula (I), m÷(m+n) is at least 0.10.

4. The silsesquioxane polymer of claim 1 wherein each R 3 of Formula (I) is independently a linear (C14-C60)alkyl.

5. The silsesquioxane polymer of claim 4 wherein each R 3 of Formula (I) is independently a linear (C16-C60)alkyl.

6. The silsesquioxane polymer of claim 5 wherein each R 3 of Formula (I) is independently a linear (C18-C30)alkyl.

7. The silsesquioxane polymer of claim 1 wherein each L 1 of Formula (I) is a bond.

8. The silsesquioxane polymer of claim 1 wherein at least a portion of the L 1 groups of Formula (I) are bonds, and at least a portion of the L 1 groups of Formula (I) are an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof.

9. The silsesquioxane polymer of claim 1 wherein, in Formula (I), m+n is an integer of at least 25.

10. The silsesquioxane polymer of claim 1 wherein, in Formula (I), m+n is an integer of up to 500.

11. The silsesquioxane polymer of claim 1 which has a (weight average) molecular weight of at least 25,000 Daltons.

12. The silsesquioxane polymer of claim 1 which has a (weight average) molecular weight of up to 250,000 Daltons.

13. An article comprising:
a substrate; and
a layer comprising a silsesquioxane polymer of claim 1 adjacent to the substrate.

14. A composition comprising:
Component (A) comprising a silsesquioxane polymer comprising a three-dimensional network of Formula (I) of claim 1 ; and
Component (B) comprising a free siloxane.

15. The composition of claim 14 comprising 90 wt-% to 99.9 wt-% of Component (A), based on the total weight of Components (A) and (B).

16. The composition of claim 14 comprising 0.1 wt-% to 10 wt-% of Component (B), based on the total weight of Components (A) and (B).

17. The composition of claim 14 wherein Component (B) comprises a free siloxane of Formula (II):

wherein:
each R 1 and R 2 is independently a (C1-C4)alkyl;
each R 6 is independently CH 2 CH 2 (CF 2 ) t CF 3 , wherein t is 0 to 10;
p is an integer of 0 or above;
q is an integer of 0 or above, and
p+q is at least 1.

18. The composition of claim 14 wherein Component (B) comprises a free siloxane of Formula (III):

wherein:
each R 1 and R 2 is independently a (C1-C4)alkyl;
each L 3 is independently a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof;
each R 3 is independently a linear (C14-C100)alkyl;
each R 6 is independently —CH 2 CH 2 (CF 2 ) t CF 3 , wherein t is 0 to 10;
x is an integer of 0 or above;
y is an integer of at least 2;
z is an integer of 0 or above; and
x+y+z is an integer of at least 2.

19. An article comprising:
a substrate; and
a layer comprising a composition of claim 14 adjacent to the substrate.

20. The article of claim 19 further comprising a layer comprising a pressure sensitive adhesive, wherein the substrate is positioned between the pressure sensitive adhesive layer and the layer comprising the composition of claim 13 .

Assignees

• 3M Innovative Properties Co

Inventors

• Rathore Jitendra S
• Kumar Ramesh C
• Jariwala Chetan P

Classifications

• C09J7/29

  Laminated material (metallised plastics C09J7/22) · CPC title

• C09J7/38

  Pressure-sensitive adhesives [PSA] · CPC title

• C09J2483/006

  in the substrate · CPC title

• C08G77/28

  sulfur-containing groups · CPC title

• C09J7/201

  characterised by the release coating composition on the carrier layer · CPC title