Back to results
US 9,957,416 B2Granted
Curable end-capped silsesquioxane polymer comprising reactive groups
Assignee3M Innovative Properties Company
InventorJitendra Rathore
Life of this patent
Estimating the term…
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.
Claims10
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
- R3 is a non-hydrolyzable group.
5 more elements
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(R1)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 R1 groups are independently a hydrolyzable group;
- and
- ii) further comprises reacting R1 groups with an end-capping agent having the general structure R5OSi(R3)3 or O[Si(R3)3]2 wherein R5 is a hydrolyzable group and R3 is independently a non-hydrolyzable group.
4 more elements
Dependencies are inferred from the claim text.