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US 9,206,290 B2Granted
Polydiorganosiloxane polyoxamide copolymers
Assignee3M Innovative Properties Company
InventorsCharles M. Leir, Karl E. Benson, Richard G. Hansen, Mark D. Purgett, Albert I. Everaerts, Audrey A. Sherman
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Abstract
Polydiorganosiloxane polyoxamide, linear, block copolymers and methods of making the copolymers are provided. The method of making the copolymers involves reacting a diamine with a precursor having at least one polydiorganosiloxane segment and at least two oxalyamino groups. The polydiorganosiloxane polyoxamide block copolymers are of the (AB)n type.
Claims13
An article comprising a copolymer comprising at least two repeat units of Formula I:
- wherein
- each R1 is independently an alkyl, haloalkyl, aralkyl, alkenyl, aryl, or aryl substituted with an alkyl, alkoxy, or halo;
- each Y is independently an alkylene, aralkylene, or a combination thereof;
- G is a divalent residue equal to a diamine of formula R3HN-G-NHR3 minus the two —NHR3 groups;
- R3 is hydrogen or alkyl or R3 taken together with G and with the nitrogen to which they are both attached forms a heterocyclic group;
- n is independently an integer of 0 to 1500;
- and
- p is an integer of 1 to 10,
- wherein the article is optically clear;
- and
- the article comprises a cast article, a molded article, an embossed article, or an extruded film.
8 more elements
Dependencies are inferred from the claim text.