Abstract: New organosilicon compounds of the formula ##STR1## R represents a hydrogen radical with 1 to 6 carbon atoms, or a phenyl radical;R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different and represent hydrogen or methyl radicals;R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are the same or different and represent hydrogen, fluorine or hydrocarbon radicals with 1 to 8 carbon atoms, or fluorinated hydrocarbon radicals, in which at least one R.sup.5, R.sup.6 R.sup.7 or R.sup.8 radicals must be a fluorine or a fluorinated hydrocarbon radical;Y is a hydrolyzable radical, hydroxyl radical or organosiloxanyl radical;A represents ##STR2## in which R.sup.9 may be the same or different and represents a hydrogen or a methyl radical; anda has a value of 0, 1, 2, or 3.

Abstract: The use of fluorinated norbornylsiloxanes of the general formula ##STR1## in which R is a hydrocarbon radical with 1 to 6 carbon atoms or a phenyl radical;R.sup.1, R.sup.2, R.sup.3, R.sup.4 are the same or different and represent hydrogen or methyl radicals;R.sup.5, R.sup.6, R.sup.7, R.sup.8 are the same or different and represent hydrogen, fluorine radicals, hydrocarbon radicals with 1 to 8 carbon atoms, or fluorinated hydrocarbon radicals with 1 to 20 carbon atoms, in which at least one of the R.sup.5, R.sup.6, R.sup.7, R.sup.8 radicals must be a fluorine or a fluorinated hydrocarbon radical,Y is an organosiloxanyl radical,A is a divalent hydrocarbon radical or an oxygen radical, anda is 0, 1 or 2for defoaming freshly extracted degassing crude oil. The compounds are highly effective and show a broader area of application for defoaming degassing crude oils of different origins.

Abstract: Melt-spin finish compositions composed of 1 - 99% by weight of compounds having the general formula ##STR1## wherein R.sup.1 is a mono-, di- or trialkylphenyl residue, in which the sum of the carbon atoms per phenyl residue, bound in the form of alkyl residues, is at least 6 and at most 12, and/or the trimethylsilyl residue,R.sup.2 is an alkyl residue with 1 to 16 carbon atoms, whereby the carbon chain may be interrupted by the groupings ##STR2## and/or the M.sub.a -O-R.sup.3 residue, whereby R.sup.3 is a mono-, di- or trialkylphenyl residue, whereby the sum of the carbon atoms per phenyl residue, bound in the form of alkyl residues, is at least 6 and at most 12, and/or is the ##STR3## residue, R.sup.4 is an alkyl residue with 1 to 16 carbon atoms and/or ##STR4## M is an alkyl residue with 1 to 3 carbon atoms, the index N MAY HAVE ANY VALUE FROM 2.5 TO 15,m a value of 0 to 5, anda a value of 0 or 1,And the average molecule contains 5 to 30 Si atoms of which at most 20 mole percent are Si* atoms, and 0.