Mixed diamine chain extender
CA 1269477 C · Owner: Albemarle Corporation · Inventors: Presswood, John Kenneth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mixtures of aromatic diamines polyurethanes, made therefrom, and processes for the preparation of the polyurethanes. The mixtures of aromatic diamines of the invention comprise a first aromatic diamine having a machine gel time of 1 to 4 seconds in a 50,000 psi modulus RIM formulation reaction and the second aromatic diamine having a slower machine gel time of 1.5 to 15 times that of the first aromatic diamine. The mixtures provide gel times of 2.5 to 10 seconds, suitable for filling large molds such as automative body panels. The novel aromatic diamine mixtures allow use of larger proportions of diamine to provide polyurethanes which are rigid but not brittle at demold and have …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 22, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.