Freeze-stable aromatic diisocyanates and processes for the...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/76 (2006.01) C07C 291/10 (2006.01) C08G 18/00 (2006.01) C08G 18/32 (2006.01) C08G 18/72 (2006.01) C08L 75/00 (2006.01)

Patent

CA 2708945

This invention relates to freeze-stable aromatic diisocyanates, an to processes for the preparation of these freeze-stable aromatic diisocyanates. The preferred aromatic diisocyanate is preferably diphenylmethane diisocyanate. These freeze-stable aromatic diisocyanates comprise a blend of an aromatic diisocyanate, with 2,2,4- trimethyl-1,3-pentanediol diisobutyrate, and have an NCO group content of from about 6% to about 29% by weight. Suitable aromatic diisocyanates contain one or more of the following modifying groups: allophanate groups, carbodiimide groups, uretonimine groups, biuret groups, dimer groups, isocyanurate groups, urea groups and/or urethane groups. Prepolymers of these modified aromatic diisocyanates are also suitable for the present invention.

La présente invention a trait à des diisocyanates aromatiques stables à la congélation et à des processus permettant de préparer ces diisocyanates aromatiques stables à la congélation. Le diisocyanate aromatique préféré est de préférence le diisocyanate de diphénylméthane. Ces diisocyanates aromatiques stables à la congélation comprennent un mélange de diisocyanate aromatique, avec du 2,2,4-triméthyl-1,3-pentanediol diisobutyrate, et présentent une teneur en groupe NCO allant d'environ 6 % à environ 29 % en poids. Les diisocyanates aromatiques appropriés contiennent un ou plusieurs des groupes modificateurs suivants : groupes allophanate, groupes carbodiimide, groupes uretonimine, groupes biuret, groupes dimère, groupes isocyanurate, groupes urée et/ou groupes uréthane. Les prépolymères de ces diisocyanates aromatiques modifiés sont également adaptés à la présente invention.

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