Organosilicon compositions for the nonstick treatment of sheets and films

Abstract

Abstract Coating compositions containing specified quantities of (a) an Alpha , omega -dihydroxydimethylpolysiloxane polymer, with a viscosity of at least 25,000 cPo at 25*C, containing at most 0.1 percent by weight of hydroxyl groups, (b) a dimethylpolysiloxane rubber terminated at each end of its chain by a unit of the formula (CH3)3SiO0.5 or (CH3)2CH2 CHSiO0.5, with a viscosity of at least 1 million cPo at 25*C, (c) a crosslinking agent of the general formula (Q)4 nSi((OCH2CH2)pOQ'')n in which the symbol Q represents a hydrolysable radical selected from the group consisting of N,N-dialkylaminoxy, ketoniminoxy and aldiminoxy radicals, the symbol Q'' represents a methyl or ethyl radical, the symbol n represents a number from 1 to 4 and the symbol p represents 1 or 2, (d) a tin, titanium or iron catalyst, (e) optionally a specified silicon containing vulcanisation accelerator and (f) an organic solvent are rendered more storage stable by incorporation of a hydroxylic methylpolysiloxane oil containing at least 3 percent by weight of hydroxyl groups, of viscosity between 3 and 400 cPo at 25*C, of the average general formula IN WHICH THE SYMBOL A REPRESENTS A NUMBER FROM 1.7 TO 2.3 AND THE SYMBOL B REPRESENTS A NUMBER FROM 0.14 TO 1. The compositions can be applied to sheets or films of various materials to render the surface non-stick when in contact with tacky substances.

Inventors

• 👤 J Dumoulin
• 👤 L Linguenheld

Bibliographic Details