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:
Aug. 14, 2012
Filed:
Jan. 23, 2008
Jens Krause, Köln, DE;
James-michael Barnes, Breitscheid-Hochscheid, DE;
Manfred Schmidt, Dormagen, DE;
Wieland Hovestadt, Leichlingen, DE;
Jens Krause, Köln, DE;
James-Michael Barnes, Breitscheid-Hochscheid, DE;
Manfred Schmidt, Dormagen, DE;
Wieland Hovestadt, Leichlingen, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
Polyurethane prepolymers are described which are prepared from 2,4'-diiso-cyanate diphenylmethane (2,4′-MDI), a polyol component and an aliphatic diisocyanate. These prepolymers can be cured with aliphatic, cycloaliphatic and/or aromatic amines to form a cured urethane elastomer. In comparison to cured urethane elastomers based on monomeric 2,4′-MDI, these prepolymers provide elastomers with extended pour life, i.e. they exhibit a slower rate of viscosity buildup after curative and prepolymer are mixed which results in a reduced propensity to crack during the curing process and gives the opportunity to cast larger parts. In comparison to polyurea/urethanes prepared from cured TDI-prepolymers and which optionally include H12-MDI, the prepolymers of the invention have better health and safety aspects.