| abstract |
THE INVENTION COMPRISES FILAMENTS AND BRISTLES HAVING A BASIS OF A DIORGANOPOLYSILOXANE WHICH COMBINE A KILOMETRIC BREAKING STRENGTH ABOVE 1.25 WITH AN ELONGATION AT BREAK OF AT LEAST 300%. THEY ARE MADE FROM DIORGANOPOLYSILOXANES IN WHICH AT LEAST 60% OF THE ORGANIC SUBSTITUENT GROUPS ARE METHYL AND A SMALL PROPORTION (0.32%) ARE VINYL, BY EXTRUSION FOLLOWED BY STRETCHING, A HEAT TREATMENT TO "VULCANIZE" THE PRODUCTS, A FURTHER STRETCH AND PREFERABLY A FURTHER HEAT TREATMENT. THE PRODUCTS MAY ALSO BE GIVEN A THIRD HEAT TREATMENT WHILE WOUND UP ON A SUPPORT. THE COMPOSITION WHICH IS EXTRUDED CONTAINS, BESIDES THE DIORGANOPOLYSILOXANE, A FILLER, A CROSSLINKING CATALYST, PREFERABLY OF THE FREE RADICAL TYPE, AND OPTIONALLY A PLASTICIZER, ESPECIALLY AN ORGANISICON COMPOUND. |