Nicholas R Nardo

US Patent:

20030036621, Feb 20, 2003

Filed:

May 25, 2001

Appl. No.:

09/865322

Inventors:

Jack Chan - Coraopolis PA, US
Nicholas Nardo - Weirton WV, US
James Rieck - Wheeling WV, US
Joseph Jupa - New Martinsville WV, US

International Classification:

C08G018/30

US Classification:

528/049000, 528/069000, 525/453000, 524/385000

Abstract:

A method for making a bloom-free thermoplastic polyurethane is disclosed. The method entails blending a chain terminator such as monofunctional alkylene alcohol having at least 14 carbon atoms, mono-isocyanate and mono-amine, in a thermoplastic polyurethane that would, but for the blending of the chain terminator of the invention, feature a blooming defect. The polyurethane suitable for the use in the inventive process is the product of a reaction wherein reactants comprise (i) at least one hydroxy functional polyol such as polyester polyol, polyether polyol and polycarbonate polyol, having a number average molecular weight of 500 to 5000 and a hydroxyl functionality of at least 2, (ii) a chain extending compound, and (iii) an organic diisocyanate. The ratio NCO/H characterizing the relative amounts of named reactants is 0.95 to 1.05. The addition of the chain terminator renders the product bloom-free.

US Patent:

20030158365, Aug 21, 2003

Filed:

Jan 9, 2002

Appl. No.:

10/043738

Inventors:

Wolfgang Brauer - Leverkusen, DE
Herbert Heidingsfeld - Frechen, DE
Hans-Georg Hoppe - Leichlingen, DE
Wolfgang Kaufhold - Koln, DE
Bernhard Schulte - Krefeld, DE
Jack Chan - Mission Viejo CA, US
Steven Manning - Imperial PA, US
Nicholas Nardo - Weirton WV, US

International Classification:

C08G018/00

US Classification:

528/044000

Abstract:

A continuous process for the preparation of a thermoplastic polyurethane elastomer is disclosed. The process is carried out at 130 to 250 C. and comprises reacting at least one polyether diol with at least one organic diisocyanate and 1,4-di-(2,2′-hydroxyethyl)-hydroquinone, in the presence of tin dioctoate as a catalyst. The resulting thermoplastic polyurethane has a glass transition temperature (T) below 50 C. The inventive thermoplastic polyurethane is suitable for making injection molded or extruded articles.