Crosslinkable compositions
AssigneeWacker Chemie AG
InventorsChristian Herzig, Bernward Deubzer, Martina Bloechl, Robert Banfic
Life of this patent
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Abstract
The present invention provides crosslinkable compositions comprising (A) an organosilicon compound having radicals containing aliphatic carbon-carbon multiple bonds, (B) an organosilicon compound having Si-bonded hydrogen atoms, (C) a catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic multiple bond, and optionally (D) an agent which retards the addition of Si-bonded hydrogen onto aliphatic multiple bond at room temperature and to the use of the crosslinkable compositions for producing coatings which repel tacky substances. The present invention also relates to organosilicon compounds having Si-bonded hydrogen atoms, and to a process for their preparation.
Claims7
A crosslinkable composition comprising
- (A) an organosilicon compound having radicals containing aliphatic carbon-carbon multiple bonds,
- (B) an organosilicon compound having Si-bonded hydrogen atoms,
- (C) a catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic multiple bond, and, optionally,
- (D) an agent which retards the addition of Si-bonded hydrogen onto aliphatic multiple bond at room temperature,
- wherein at least one (B) organosilicon compound having Si-bonded hydrogen atoms is an organosilicon compound (B.sup.1) comprising
- (a) terminal units of the formula
- H.sub.a R.sub.3-a SiO.sub.1/2 (I)
- and, optionally, terminal units of the formula
- R.sub.3 SiO.sub.1/2 (I')
- in which
- R is an identical or different monovalent, optionally halogenated hydrocarbon radical having 1 to 8 carbon atoms per radical and is free from aliphatic multiple bonds, and
- a is 1, 2 or 3,
- with the proviso that at least 50 mole % of the terminal units are those of formula (I),
- (b) carbo-structural units G (II)
- in which
- G is an identical or different divalent to decavalent aliphatic hydrocarbon radical having 2 to 30 carbon atoms per radical optionally containing one or more heteroatoms selected from the group consisting of oxygen, boron, silicon, tin and titanium,
- with the proviso that at least two Si atoms are connected to one another via G,
- (c) units of the formulae ##EQU7## or mixtures thereof, in which R is as defined above, and
- b is 0, 1 or 2,
- with the provisos that b in formula (III') is not 2 and the units of formula (III) or (III') are connected via the Si atoms to the carbo-structural units G,
- and, optionally,
- (d) units of the formula ##EQU8## in which R is as defined above,
- c is 0 or 1 and
- d is 1 or 2 and the sum c+d is 1 or 2,
- with the proviso that the units of formula (IV) are located between the units of formula (III) or (III') and the terminal units of formulae (I) or (I'), and
- with the proviso that the organosilicon compounds (B.sup.1) on average contain 8 to 50 Si-bonded hydrogen atoms per molecule.
An organosilicon compound (B.sup.1) having Si-bonded hydrogen atoms and comprising
- (a) terminal units of the formula
- H.sub.a R.sub.3-a SiO.sub.1/2 (I)
- and, optionally, terminal units of the formula
- R.sub.3 SiO.sub.1/2 (I')
- in which
- R is an identical or different monovalent, optionally halogenated hydrocarbon radical which has 1 to 15 carbon atoms per radical and is free from aliphatic multiple bonds, and
- a is 1, 2 or 3,
- (b) carbo-structural units G (II)
- in which
- G is an identical or different divalent to decavalent aliphatic hydrocarbon radical having 2 to 30 carbon atoms per radical optionally containing one or more heteroatoms selected from the group consisting of oxygen, boron, silicon, tin and titanium, with the proviso that at least two Si atoms are connected to one another via G,
- (c) units of the formulae ##EQU9## or mixtures thereof in which R is as defined above, and
- b is 0, 1 or 2,
- with the provisos that b in formula (III') is not 2 and the units of formula (III) or (III') are connected via the Si atoms to the carbostructural units G,
- and, optionally,
- (d) units of the formula ##EQU10## in which R is as defined above,
- C is 0 or 1 and
- d is 1 or 2 and the sum c+d is 1 or 2,
- with the proviso that the units of formula (W) are located between the units of formula (III) or (III') and the terminal units of the formula (I) or (I'), and
- the organosilicon compound (B.sup.1) on average contains 8 to 50 Si-bonded hydrogen atoms per molecule.
Dependencies are inferred from the claim text.