Curable end-capped silsesquioxane polymer comprising reactive groups

Patent metadata

Field	Value
Publication number	US-2017190843-A1
Application number	US-201715462017-A
Country	US
Kind code	A1
Filing date	Mar 17, 2017
Priority date	Sep 22, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

Curable silsesquioxane polymers are described comprising a silsesquioxane polymer comprising reactive groups. The curable silsesquioxane polymer is free of ethylenically unsaturated groups. The silsesquioxane polymers may be homopolymers or copolymers. Also described are methods of preparing curable silsesquioxane polymer, articles comprising curable or cured compositions comprising the silsesquioxane polymers, and methods of curing.

First claim

What is claimed is:

1 . A curable silsesquioxane polymer having the formula

wherein m is at least 2; or

wherein n is at least and m is at least 1; and wherein
the oxygen atom at the * is bonded to another Si atom within a three-dimensional branched network,
R10 is an organic group lacking a reactive group and lacking an ethylenically unsaturated group,
R11 is an organic group comprising a reactive group that is not an ethylenically unsaturated group or a hydrolyzable group, and
R 3 is a non-hydrolyzable group.

2 . The curable silsesquioxane polymer of claim 1 wherein the reactive group is selected from mercapto, epoxy, isocyanto and combinations thereof.

3 . The curable silsesquioxane polymer of claim 1 wherein n and m are each no greater than about 500 g/mole.

4 . The curable silsesquioxane polymer of claim 1 wherein the curable silsesquioxanepolymer further comprise —OH groups present in an amount of no greater than 5 wt-% of the silsesquioxane polymer.

5 . The curable silsesquioxane polymer of claim 1 wherein the silsesquioxane polymer is free of —OH groups.

6 . The curable silsesquioxane polymer of claim 1 wherein the reactive groups can be crosslinked via exposure to ultraviolet radiation.

7 . A photocurable composition comprising at least one monomer, oligomer, or polymer comprising ethylenically unsaturated groups and a curable silsesquioxane polymer crosslinker of claim 1 .

8 . The photocurable composition of claim 7 wherein the ethylenically unsaturated groups of the monomer, oligomer, or polymer are (meth)acrylate, vinyl, or a combination thereof.

9 . The photocurable composition of claims 7 - 8 wherein the monomer, oligomer, or polymer is a siloxane containing monomer, oligomer or polymer.

10 . The photocurable composition of claims 7 - 9 wherein the composition is free of photoinitiator.

11 . A method of preparing a curable silsesquioxane polymer comprising
i) forming a first silsesquioxane polymer core by polymerizing one or more reactants comprising at least one reactant of the formula V—Y—Si(R 1 ) 3 wherein:
V is an organic group comprising a reactive group that is not an ethylenically unsaturated group or a hydrolyzable group;
Y is a covalent bond or a divalent linking group; and
at least two R 1 groups are independently a hydrolyzable group; and
ii) further comprises reacting R 1 groups with an end-capping agent having the general structure R 5 OSi(R 3 ) 3 or O[Si(R 3 ) 3 ] 2 wherein R 5 is a hydrolyzable group and R 3 is independently a non-hydrolyzable group.

12 . The method of claim 11 wherein the reactive group is selected from mercapto, epoxy, isocyanto and combinations thereof.

13 . The curable silsesquioxane polymer of claim 11 wherein n and m are each no greater than about 500 g/mole.

14 . The curable silsesquioxane polymer of claim 11 wherein the curable silsesquioxanepolymer further comprise —OH groups present in an amount of no greater than 5 wt-% of the silsesquioxane polymer.

15 . An article comprising a substrate and the curable or cured composition of claims 1 - 10 disposed on at least a portion of a surface of a substrate.

16 . A method of curing a silsesquioxane polymer comprising
providing a curable silsesquioxane polymer according to claims 1 - 10 ; and exposing the curable silsesquioxane polymer to actinic radiation.

17 . The method of claim 16 wherein the actinic radiation is ultraviolet radiation.

Assignees

• 3M Innovative Properties Co

Inventors

• Rathore Jitendra

Classifications

• C08G77/045

  containing less than 25 silicon atoms · CPC title

• C09D183/04 Primary

  Polysiloxanes · CPC title

• C08G77/12

  containing silicon bound to hydrogen · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C09D183/14

  in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms (C09D183/10 takes precedence) · CPC title