Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1973-12-07
1976-02-03
Martin, William D.
Stock material or miscellaneous articles
Composite
Of quartz or glass
260291SB, 260 336SB, 260 338SB, 427358, 427387, 427428, 428443, 428447, 428457, 428475, 428480, 428532, 428537, B32B 1508, B32B 1710, B32B 2706, B32B 2728
Patent
active
039365786
ABSTRACT:
Sheets or films are rendered non-stick towards tacky substances by applying a coating composition containing specified quantities of (a) an .alpha.,.omega.-dihydroxydimethylpolysiloxane polymer, with a viscosity of at least 25,000 cPo at 25.degree.C, containing at most 0.1% by weight of hydroxyl groups, (b) a dimethylpolysiloxane rubber terminated at each end of its chain by a unit of the formula (CH.sub.3).sub.3 SiO.sub.0.5 or (CH.sub.3).sub.2 CH.sub.2 =CHSiO.sub.0.5, with a viscosity of at least 1 million cPo at 25.degree.C, (c) a crosslinking agent of the general formula (Q).sub.4.sub.-n Si[(OCH.sub.2 CH.sub.2).sub.p OQ'].sub.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% by weight of hydroxyl groups, of viscosity between 3 and 400 cPo at 25.degree.C, of the average general formula ##EQU1## IN WHICH THE SYMBOL A REPRESENTS A NUMBER FROM 1.7 TO 2.3 AND THE SYMBOL B REPRESENTS A NUMBER FROM 0.1 TO 1.
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Dumoulin Jean
Linguenheld Louis
Martin William D.
Rhone-Poulenc S.A.
Schmidt William H.
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