Michael acceptor-terminated prepolymer preparation according to the invention
September 11, 2015 14:22
Title: MICHAEL ACCEPTOR-TERMINATED URETHANE-CONTAINING FUEL RESISTANT PREPOLYMERS AND COMPOSITIONS THEREOF
Number/Link: US2015/0252232
Applicant/Assignee: PRC-DeSoto
Publication date: 10-09-2015
“Gist”: A PU prepolymer is capped with Michael accepting groups and then cured with a dithiol
Why it is interesting: This invention is about sulphur containing PU sealants with properties acceptable for the aerospace industry. A bis(vinylsulfonyl)- terminated urethane-polythioether prepolymer is prepared according to the scheme below. The prepolymer can then be cured with a dithiol-ended polyether, catalysed by a tertiary amine. The compositions have an extended pot life and the curing rate can be controlled by using an encapsulated tert-amine as a controlled-release catalyst.
Michael acceptor-terminated prepolymer preparation according to the invention
Posted by Gerhard Bleys
Categories: Adhesives-Coatings, Isocyanates and Prepolymers
Tags: catalysts, H12MDI, hybrid, pot life, prepolymer, sealants, thiols
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