Aliphatic petroleum-based resins, method to control their softening point and molecular weight and hot melt pressure sensitive adhesive containing same
CA 2199331 A1 · Owner: Eastman Chemical Resins, Inc. · Inventors: Lenselink, Berend; Theelen, Michael H.; Donker, Christiaan P.L.C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a petroleum-based aliphatic resin having: a) a Ring and Ball (R&B) softening point in the range of 75 to 110°C; b) a weight average molecular weight (Mw) of 1000 to 2600 Dalton a, z-average molecular weight (MZ) from 1900 to 5000 Dalton and an Mw/Mn below 2.0; c) a level of aromatic protons below 1.5 % with respect to the total protons determined by 1H-NMR; and d) a mixed methylcyclohexane aniline cloud point (MMAP) of 90°C or less. The resins according to the invention are characterized by a high amount of cyclic structures. Further disclosed is a method of independently controlling the R&B softening point and the molecular weight of an aliphatic resin composition …
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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
- Filed March 6, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 6, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 6, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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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.