Polydiorganosiloxane oligourea segmented copolymers and a process for making same
Assignee3M Innovative Properties Company
InventorsAUDREY A SHERMAN, WALTER R. ROMANKO, ALBERT I. EVERAERTS, CHARLES M. LEIR, MIECZYSLAW H. MAZUREK, CONSTANCE J. NELSON
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Abstract
The present invention provides polydiorganosiloxane oligourea segmented copolymers. The copolymers contain soft polydiorganosiloxane units, hard segments that are diisocyanate residues, the polydiorganosiloxane units and diisocyanate residues being connected by urea linkages, and terminal groups that are nonreactive, reactive under free radical or moisture cure conditions, or amines. The invention also provides methods of preparing the copolymers.
Claims8
Polydiorganosiloxane oligourea segmented copolymers comprising soft polydiorganosiloxane units, hard polyisocyanate residue units, wherein the polyisocyanate residue is the polyisocyanate minus the —NCO groups, optionally, soft and/or hard organic polyamine units, wherein residues of the isocyanates amine units are connected by urea linkages, and terminal groups, wherein the terminals groups are non-functional endcapping groups or functional endcapping groups.
A polydiorganosiloxane oligourea segmented copolymer comprising the reaction product of:
- (a) at least one polyisocyanate;
- (b) an endcapping agent having a terminal selected from polydiorganosiloxane monoamines and non-siloxane containing endcapping agents having a terminal portion reactive with an amine or isocyanate and a terminal portion that is non-functional or that can react under moisture-cure or free-radical conditions,
- with the provisos (1) that if no polydiorganosiloxane monoamine is present, then at least one polyamine is present, wherein polyamine comprises at least one polydiorganosiloxane diamine or a mixture of at least one polydiorganosiloxane diamine and at least one organic polyamine, (2) if only polyisocyanate and polyamine are present, the molar ratio of isocyanate to amine is <0.9:1 or >1.1:1, and (3) when polydiorganosiloxane monoamine and diamine are present, the ratio of total isocyanate available in the polyisocyanate to the total amine available in the monoamine and diamine less any amine end groups in the copolymer is about 1:1.
Dependencies are inferred from the claim text.