Photosensitive elastomeric polymer composition for flexographic printing plate
CA 1268985 C · Owner: Worns, John Richard · Inventors: Worns, John Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a flexible photopolymer printing plate composition comprising a homogenous blend of:, (A) a high molecular weight butadiene-acrylonitrile copolymer having a number average molecular weight of about 30,000 to 125,000, an acrylonitrile content of 10 to 50% by weight, a carboxyl content of 2 to 15% by weight, and a Mooney viscosity (ML-4 at 100°C) of 45 or higher; and, (B) a medium molecular weight butadiene-acrylonitrile copolymer having a number average molecular weight of about 15,000 to 40,000, an acrylonitrile content of 10 to 40% by weight, a carboxyl content of 1-15% and a, Mooney viscosity (ML-4 at 100°C) of from 15 to less than 45.
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 May 15, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 15, 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.