Flame-proofing vulcanisable poly:organo:siloxane! - with powdered chalk and bromo-substd. di:phenyl ether mixt.

摘要

This is a Patent of Addn. to 2909462 which discloses the use of a Br-substd. diphenyl ether halogen-donor and chalk filler mixt. as flame-retardant additive compsn. to hardenable polyorganosiloxanes. According to Patent of Addn., the flame-retardant mixt. can be added not only to polyorganosiloxane compsns. hardenable at room temp. under air-moisture, as in Parent Patent, but also to one- or multi-component polyorganosiloxane compsns. contg. at least one material allowing polyorganosiloxane hardening to rubber-elastic state only at high temps. and/or by ionising radiation. Compsn. use to achieve vulcanisate end prod. Shore A hardness 40-90 is claimed. Non-inflammable high temp.-vulcanisable silicone profiles can be used in building components, e.g. glass fulfilling DIN 4102 resistance class G 120 and doors of resistance class T 120. High temp.-vulcanisable polyorganosiloxane-contg. compsns. retain their mechanical properties and resistance to environmental conditions. High temp.-hardenable silicone rubber can be permanently cemented with substrates using room temp. or moisture-hardenable polyorganosiloxane compsns.