Low solvent, thermoplastic polyurethane containing solvent cement

US5563193A · kind A · utility

Assignee

• BASF SE

Inventors

• Ulrich Abel · Schifferstadt, DE
• Lawrence E. James
• Mark W. Waldrop · Royal Oak, US

Key dates

• Filing date: Jan 25, 1996
• Grant date: Oct 8, 1996
• Expiry date: Jan 25, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/3158
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

There is now provided a solvent cement having a total of less than 80 weight percent of solvents and a thermoplastic polyurethane elastomer as at least one of the resins dissolved in the solvent. The solvent mixture contains at least a 5- or 6-membered water miscible lactone or lactam such as N-methyl-2-pyrrolidone (NMP) in an amount of 21 weight percent or less based on the weight of all the ingredients. The reduced solvent concentration assists in lowering VOC emissions while preserving the hydrostatic burst strength mechanical property required by ASTM D 2564-88.