The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 15, 2012
Filed:
Jan. 09, 2008
Edmond Derderian, Charleston, WV (US);
Richard Gerkin, Cross Lanes, WV (US);
Edmond Derderian, Charleston, WV (US);
Richard Gerkin, Cross Lanes, WV (US);
PolyPlexx, LLC, South Charleston, WV (US);
Abstract
The present invention teaches a new process to produce novel, hard, optically clear, impact-resistant polyurethane polymers that are characterized by excellent thermo mechanical properties and chemical resistance, and the polymers made as a result of such a process. The polyurethanes are made by reacting a) a prepolymer made by reacting a polyisocyanate with a primary amine-terminated polyether with an amine functionality of about 2 and a molecular weight of >1000, and in which the free —NCO content of the resulting prepolymer is >18% by weight; with b) (i) a polyol having an average hydroxyl functionality greater than or equal to 2 and an average hydroxyl equivalent weight of from about 300 to about 1,000, and (ii) a curing agent that has isocyanate reactive groups, a functionality of 2 to 3 and a molecular weight of <400. More preferably the prepolymer is made by reacting a cycloaliphatic polyisocyanate with a primary amine-terminated polyether diamine of 2000 to about 2500 molecular weight, the polyol is either a polyester polyol triol with a molecular weight of between about 540 and 900, or a polyether glycol with a molecular weight of between about 650 and 2000, or a polyester polyol diol with a molecular weight of up to 2,000, and the curing agent is either dianhydrohexitol, an aromatic diamine, an aromatic ring containing diol or a cyclohexanedimethanol.