Polydiorganosiloxane oligourea segmented copolymers and a...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 77/458 (2006.01) C08G 18/28 (2006.01) C08G 18/61 (2006.01) C08G 18/71 (2006.01) C08G 18/81 (2006.01) C08G 18/83 (2006.01)

Patent

CA 2218363

The present invention provides polydiorganosiloxane oligourea segmented copolymers. The copolymers contain soft polydiorganoxiloxane units, hard segments that are diisocyanate residues, the polydiorganoxiloxane units and diisocyanate residues being connected by urea linkages, and terminal groups that are non-reactive, reactive under free radical or moisture cure conditions, or amines. The invention also provides methods of preparing the copolymers.

La présente invention concerne des copolymères segmentés de polydiorganosiloxanes et d'oligo-urée. Ces copolymères contiennent des unités souples de polydiorganosiloxanes, des segments durs qui sont des résidus de diisocyanate, les unités de polydiorganosiloxanes et les résidus de diisocyanate étant reliés par des liaisons urée, et des groupes d'extrémités qui sont non réactifs, réactifs dans des conditions de durcissement à l'humidité ou en présence de radicaux libres, ou des amines. L'invention concerne aussi des procédés de préparation des copolymères.

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