Curable end-capped silsesquioxane polymer comprising reactive groups

Patent metadata

Field	Value
Publication number	US-9957416-B2
Application number	US-201715462017-A
Country	US
Kind code	B2
Filing date	Mar 17, 2017
Priority date	Sep 22, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

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 an isocyanato 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 n and m are each no greater than about 500.

3. 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.

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

5. An article comprising a substrate and the curable composition of claim 1 disposed on at least a portion of a surface of a substrate.

6. A curable composition comprising at least one hydroxyl functional monomer or polymer and the curable silsesquioxane polymer of claim 1 .

7. A curable composition comprising at least one amino terminated polydimethylsiloxane and the curable silsesquioxane polymer of claim 1 .

8. 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 an isocyanto 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.

9. The curable silsesquioxane polymer of claim 8 wherein n and m are each no greater than about 500.

10. The curable silsesquioxane polymer of claim 8 wherein the curable silsesquioxanepolymer further comprise —OH groups present in an amount of no greater than 5 wt-% of the silsesquioxane polymer.

Assignees

• 3M Innovative Properties Co

Inventors

• Rathore Jitendra

Classifications

• 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

• C08L83/00

  Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08G77/045

  containing less than 25 silicon atoms · CPC title

• C08K5/56

  Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond · CPC title