US 2004/0170845 A1Published application

Alkenyl-functional siloxane copolymers as antimisting additives for silicone coating compositions

AssigneeWacker Chemie AG

InventorsChristian Herzig, Hans Lautenschlager, Martina Bloechl

Life of this patent

Estimating the term…

Loading patent…

Abstract

Antimisting additives are used in crosslinkable silicone coating compositions for reducing aerosol formation, the antimisting additives being alkenyl-functional siloxane copolymers prepared by reacting a hydrocarbon containing at least three aliphatic double bonds, and with an organosiloxane (2) having terminal Si-bonded hydrogen atoms in the presence of a hydrosilylation catalyst (3) at a ratio of Si-bonded hydrogen to aliphatic double bonds of from 1.3 to 10, and subsequently reacting the resulting SiH-containing hydrocarbon-siloxane copolymer with an α,ω-dialkenylsiloxane polymer (4) in the presence of a hydrosilylation catalyst (3) at a ratio of aliphatic double bonds to Si-bonded hydrogen of from 1.2 to 10, and optionally, in another step, equilibrating the resulting alkenyl-functional siloxane copolymers with an organopolysiloxane (5).

Claims16

Dependent claims

In a process for reducing aerosol in applying a crosslinkable silicone coating composition onto a substrate wherein an antimisting additive is added to the coating composition, the improvement comprising adding to said crosslinkable silicone coating composition an antimisting additive comprising at least one alkenyl-functional siloxane copolymer prepared by

reacting, in a first step a compound (1) containing at least three aliphatic double bonds, of the formula
R2(CR3═CH2)x (I)
where R2 is a trivalent or tetravalent hydrocarbon radical optionally containing one or more non-adjacent oxygen, silicon, or titanium heteroatoms,
R3 is a hydrogen atom or alkyl radical, and
x is 3 or 4
with an organosiloxane (2) having terminal Si-bonded hydrogen atoms, in the presence of at least one catalyst (3) which promotes the addition of Si-bonded hydrogen onto an aliphatic double bond,
the ratio of Si-bonded hydrogen in the organosiloxane (2) to aliphatic double bond in organic compound (1) being from 1.3 to 10, and
reacting, in a second step, SiH-containing hydrocarbon-siloxane copolymer(s) obtained in the first step with at least one α,ω-dialkenylsiloxane polymer (4),
in the presence of a catalyst (3) which promotes the addition of Si-bonded hydrogen onto an aliphatic double bond,
the ratio of aliphatic double bond in the α,ω-dialkenylsiloxane polymer (4) to SiH groups in the hydrocarbon-siloxane copolymer(s) being from 1.2 to 10,
and optionally, in a third step,
equilibrating alkenyl-functional siloxane copolymer(s) obtained from the second step with one or more organopolysiloxane(s) (5) selected from the group consisting of linear organopolysiloxanes containing terminal triorganosiloxy groups, linear organopolysiloxanes containing terminal hydroxyl groups, branched organopolysiloxanes optionally containing hydroxyl groups, cyclic organopolysiloxanes, and copolymers comprising diorganosiloxane and monoorganosiloxane units.

9 more elements

A crosslinkable silicone coating composition with reduced aerosol formation, comprising

(A) organosilicon compounds having radicals containing aliphatic carbon-carbon multiple bonds,
(B) organosilicon compounds containing Si-bonded hydrogen atoms,
(C) catalysts which promote the addition of Si-bonded hydrogen onto aliphatic multiple bond,
(D) optionally, inhibitors, and
(X) an antimisting additive prepared by reacting, in a first step a compound (1) containing at least three aliphatic double bonds, of the formula
R2(CR3═CH2)x (I)
where R2 is a trivalent or tetravalent hydrocarbon radical optionally containing one or more non-adjacent oxygen, silicon, or titanium heteroatoms,
R3 is a hydrogen atom or alkyl radical, and
x is 3 or 4
with an organosiloxane (2) having terminal Si-bonded hydrogen atoms, in the presence of at least one catalyst (3) which promotes the addition of Si-bonded hydrogen onto an aliphatic double bond,
the ratio of Si-bonded hydrogen in the organosiloxane (2) to aliphatic double bond in organic compound (1) being from 1.3 to 10, and
reacting, in a second step, SiH-containing hydrocarbon-siloxane copolymer(s) obtained in the first step with at least one α,ω-dialkenylsiloxane polymer (4),
in the presence of a catalyst (3) which promotes the addition of Si-bonded hydrogen onto an aliphatic double bond,
the ratio of aliphatic double bond in the α,ω-dialkenylsiloxane polymer (4) to SiH groups in the hydrocarbon-siloxane copolymer(s) being from 1.2 to 10,
and optionally, in a third step,
equilibrating alkenyl-functional siloxane copolymer(s) obtained from the second step with one or more organopolysiloxane(s) (5) selected from the group consisting of linear organopolysiloxanes containing terminal triorganosiloxy groups, linear organopolysiloxanes containing terminal hydroxyl groups, branched organopolysiloxanes optionally containing hydroxyl groups, cyclic organopolysiloxanes, and copolymers comprising diorganosiloxane and monoorganosiloxane units.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/797,987Filed 11 Mar 2004
Priority: DE 101 61 334.213 Dec 2001
Published: 2 Sep 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

C08G 77/50
In which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms: by carbon linkages
C09D 183/04
Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing…:…
Y10T 428/31663
Of asbestos: as siloxane, silicone or silane
C08G
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds

Family

Application10/298,715Division · filed 18 Nov 2002
Application10/797,987Division · filed 11 Mar 2004
US 2003/0134043 A1Published application
US 6,764,717 B2Related patent
US 6,956,096 B2Related patent
US 2004/0170845 A1This patent

From the US filing history. Foreign family members aren’t listed.