Impact modified methyl methacrylate polymer
CA 1265281 C · Owner: Aristech Acrylics Llc · Inventors: Cutter, Louis Ammi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A clear, cast acrylic sheet of improved impact strength may be prepared by dispersing or dissolving 8-14% of an ABA block copolymer, (where A is styrene, B is a hydrogenated butadiene containing a large 1-2 butadiene fraction) in a methyl methacrylate casting mixture which contains 5-11% styrene and polymerizing in, sheet form by heating with free radical initiators. Cutter
Read the whole patent
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 January 30, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 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.