Process for the production of acetoxysilylethyl-substituted organopolysiloxanes

Abstract

Abstract ACETOXYSILYETHYL-SUBSTITUTED ORGANOPOLYSILOXANES HAVING A HIGH CONTENT OF FUNCTIONAL SUBSTITUTENTS, CORRESPONDING TO THE GENERAL FORMULA ((CH3-)3-SI-O-)U-((SI(-CH3)(-CH2-CH2-SI(-CH3)(3-N)(-OOC- CH3)N)-O)R-(SI(-H)(-CH3)-O)(P-R))-(-SI(-CH3)3)V IN WHICH P IS AN INTEGER FROM 3 TO 100 INCLUSIVE; R IS AN INTEGER IN THE RANGE OF FROM P/2 TO P; U AND V HAVE THE SAME VALUE, THIS VALUE BEING ZERO OR ONE ; N IS 2 OR 3; ARE PRODUCED BY REACTING A VINYLACETOXYSILANE OF THE GENERAL FORMULA CH2=CH-SI(-CH3)(3-N)(-OOC-CH3)N WITH A METHYL-HYDROGEN-POLYSILOXANE OF THE GENERAL FORMULA ((CH3-)3-SI-O-)U-(SI(-H)(-CH3)-O)P-(-SI(-CH3)3)V IN THE PRESENCE OF A PLATINUM CATALYST, ACCORDING TO THE INVENTION, IN A NEW MANNER WHICH COMPRISES INTIMATELY MIXING THE TWO REACTANTS IN PROPORTION OF 0.98 TO 1.1 MOL VINYLACETOXYSILANE PER EACH GRAM ATOM OF SI-BOUND HYDROGEN TO BE REACTED IN THE METHYL-HYDROGEN-POLYSILOXANE, WITH ONE ANOTHER AND WITH THE CATALYST AT ROOM TEMPERATURE; ALLOWING THE MIXTURE TO FLOW THROUGH A REACTION ZONE HEATED TO A TEMPERATURE OF BETWEEN 180 AND 200*C. AT SUCH A SPEED THAT THE TIME OF RESIDENCE OF THE REACTION MIXTURE IN THE HEATED ZONE IS 30 TO 60 SECONDS; AND RAPIDLY COOLING THE PRODUCT FLOWING FROM THE REACTION ZONE TO A TEMPERATURE OF BELOW 50*C. THE PRODUCTS ARE ESPECIALLY SUITABLE FOR COATINGS BECAUSE THEY REACT VERY READILY WITH ATMOSPHERIC HUMIDITY THEREBY FORMING RESINOUS SOLID PRODUCTS.

Inventors

• 👤 W Noll
• 👤 K Rudolph
• 👤 W Buchner

Bibliographic Details