Process for foaming plastics
AssigneeCiba-Geigy Corporation
InventorsRudolf Kirchmayr, Werner Fussenegger, Hugo Illy
Life of this patent
Estimating the term…
Abstract
A process for foaming thermoplastic materials by adding to the plastics material 0.05 to 5 percent by weight of a dioxazolone of the formula I ##STR1## in which n is 1, 2 or 3, and when n is 1 R is C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.12 -alkenyl, C.sub.7 -C.sub.9 -aralkyl, C.sub.3 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl, or phenyl substituted by C.sub.1 -C.sub.9 -alkyl, halogen, C.sub.1 -C.sub.9 -alkoxy or nitro, or it is a heterocyclic radical, or when n is 2 R is C.sub.1 -C.sub.8 -alkylene, ethenylene, m- or p-phenylene, m- or p-halophenylene, biphenylene, oxy-bis-(p-phenylene), 2,5-thienylene, 2,5-furylene, 2,6-pyridylene or naphthylene, or when n is 3 R is phenenyl, and subsequently heating the mixture.
Claims9
A process for foaming thermoplastic materials by adding to the plastics material a blowing agent consisting essentially of 0.05 to 5 percent by weight of a dioxazolone of the formula I ##STR5## in which n is 1, 2 or 3, and when n is 1
- R is C.sub.1 -C.sub.12 -alkyl, C.sub.7 -C.sub.9 -aralkyl, C.sub.3 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl, or phenyl substituted by C.sub.1 -C.sub.9 -alkyl, halogen, C.sub.1 -C.sub.9 -alkoxy or nitro;
- or is a heterocyclic radical, or when n is 2
- R is C.sub.1 -C.sub.8 -alkylene, m- or p-phenylene, m- or p-halophenylene, biphenylene, oxy-bis-(p-phenylene), 1,4-cyclohexylene, 2,5-thienylene, 2,5-furylene, 2,6-pyridylene or naphthylene, or when n is 3
- R is phenenyl,
- and subsequently heating the mixture.
Dependencies are inferred from the claim text.