Blowing agent concentrate

US4278769A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Peter Gebauer · Troisdorf, DE
• Karl Sturm

Key dates

• Filing date: Feb 21, 1979
• Grant date: Jul 14, 1981
• Expiry date: Feb 21, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2467/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A blowing agent concentrate comprising a chemical blowing agent and a thermoplastic composition vehicle therefore, said thermoplastic composition being a saturated polyester and/or copolyester having a crystalline melting point between 100.degree. C. and 220.degree. C. and a reduced viscosity of 0.4 dl/g to 1.6 dl/g; the use of such blowing agent concentrate in the formation of foamed articles of high molecular weight polyalkyleneterephthalate which articles can be filled and/or reinforced and/or flame proofed and can contain other additives. Particularly contemplated is the use of such blowing agent concentrate in the formation of glass fiber reinforced structural foam moldings of polyalkyleneterephthalates especially polytetramethylene terephthalates.