EP0818497A2
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EP
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Aqueous emulsions crosslinkable by Michael addition reactions to form silicon modified organic compositions
Assignee: Dow Silicones Corp
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Filing: 1997-07-01
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Granted: —
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Expires: 2017-07-01
Abstract
Abstract An aqueous emulsion is claimed, which crosslinks by a Michael addition reaction, yielding a crosslinked silicon modified organic composition upon removal of water. The aqueous emulsion comprises the product formed by mixing a polymer containing at least two Michael acceptor groups per polymer molecule, water, a surfactant and an effective amount of a crosslinker containing sufficient reactive hydrogen atoms of a Michael donor per crosslinker molecule or a precursor thereto. To obtain a crosslinked silicon modified organic composition upon the removal of water, the polymer or the crosslinker must contain at least one silicon atom. Our invention also includes a method for making these emulsions.
Inventors
- 👤 Donald Taylor Liles
- 👤 David Logan Murray
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 12:40
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/07; C08J3/24; C08J3/26; C08F; C08F8/00; C08F8/42; C08K; C08K5/00; C08K5/54; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/08; C08L; C08L2201/00; C08L2201/54; C08L33/00; C08L33/04; C08L33/06; C08L33/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
228 words
An aqueous emulsion, yielding a crosslinked silicon modified
organic composition upon removal of water, said emulsion comprising a product
formed by mixing (A) a polymer selected from a modified organic polymer or a silicon
modified organic polymer, each polymer molecule having at least 2 acceptor
groups individually selected from the group consisting of CH 2 =CR 1 COR 2 -,
CH 2 =CR 1 COOR 2 -, CH 2 =CR 1 CONHR 2 - and CH 2 =CR 1 CR 1 =CR 2 -, where R 1 is
individually selected from hydrogen atom or monovalent, aliphatic hydrocarbon
radicals having from 1 to 15 carbon atoms and R 2 is a divalent hydrocarbon
radical having from 2 to 15 carbon atoms; (B) water; (C) a surfactant; and (D) an effective amount of a crosslinker selected from silicon
containing crosslinker or non-silicon containing crosslinker, the crosslinker
having sufficient reactive hydrogen atoms per crosslinker molecule or a
precursor thereto, wherein the reactive hydrogen atoms are covalently bonded to
a nitrogen or sulfur atom of a donor group selected from the group consisting of
-SH, -NH 2 and -NHR 3 , where R 3 is a monovalent hydrocarbon radical having
from 1 to 15 carbon atoms; provided, the polymer or the crosslinker contains at least one
silicon atom so the emulsion yields said crosslinked silicon modified organic
composition upon removal of water.
Claim 2
Dependent Claim
41 words
The emulsion of claim 1 wherein the polymer is a silicon
modified organic polymer and the effective amount of crosslinker is an amount
providing at least a stoichiometric equivalent of reactive hydrogen atoms relative
to the acceptor groups on the polymer.
Claim 3
Dependent Claim
99 words
The emulsion of claim 2 wherein the silicon modified organic
polymer is formed by copolymerizing an organic monomer and either a
copolymerizable silane, a copolymerizable silazane or a copolymerizable
siloxane to produce an organic polymer having silanol groups pendant along the
polymer chain, and then by condensing the silanol groups with a hydrolyzable
silane functionalized with at least one acceptor group in the presence of a tin
catalyst to form an organic polymer having acceptor groups pendant along the
polymer chain that are bonded to the polymer through a siloxane bond; and the
crosslinker is a silicon containing compound.
Claim 4
Dependent Claim
239 words
The emulsion of claim 3 wherein 0.1 to 20% by weight of the
polymer comprises acceptor groups having the formula CH 2 =CR 1 COOR 2 - where
R 1 is hydrogen atom or a methyl radical and R 2 is a propylene radical; the
crosslinker is selected from siliconates having the formula
(M + O - ) m Si(OH) 3-m (R'NH 2-a R a 3 ) or (M + O - ) n Si(OH) 2-n (R'NH 2-a R a 3 )R'', where M is
individually selected from alkali metal cations, a phosphonium group or an
ammonium group; R' is a divalent hydrocarbon radical having from 3 to 8 carbon
atoms, one valence attached to the silicon atom and one valence attached to a
NH 2-a R a 3 group, where a is 0 or 1 and R 3 is a monovalent hydrocarbon radical
having from 1 to 15 carbon atoms; R'' is a monovalent hydrocarbon radical
having 1 to 8 carbon atoms; m is a whole or fractional number from 0.1 to 3 and
n is a whole or fractional number from 0.1 to 2, and (CH 3 O) 2 SiCH 3 (CH 2 ) 3 SH or
H 2 NCHCH 3 CH 2 (OCH 2 CHCH 3 ) 3 NH 2 ; and the effective amount of crosslinker is an
amount providing a stoichiometric excess of reactive hydrogen atoms relative to
the acceptor groups on the polymer.
Claim 5
Dependent Claim
96 words
The emulsion of claim 4 wherein R 1 of the acceptor group is
hydrogen and the crosslinker is selected from a siliconate having the formula
(M + O - ) n Si(OH) 2-n (R'NH 2-a R a 3 )R'', where M is Na + or K + , R' is a propylene group, a
is 0, R'' is a methyl radical and n is from 0.5 to 1, and (CH 3 O) 2 SiCH 3 (CH 2 ) 3 SH or
H 2 NCHCH 3 CH 2 (OCH 2 CHCH 3 ) 3 NH 2 .
Claim 6
Dependent Claim
60 words
The emulsion of claim 5 wherein the crosslinker is
NaO(OH)SiCH 3 (CH 2 ) 3 NH 2 ; the acceptor groups comprise 1 to 3 percent by
weight of the polymer and the effective amount of crosslinker is an amount
providing a 2 to 10 fold stoichiometric excess of reactive hydrogen atoms
relative to the acceptor groups on the polymer.
Claim 7
Dependent Claim
10 words
The emulsion of claim 6 and further comprising a filler.
References Cited (Backward Citations)
EP0267003A1
Cited
EP0280400A2
Cited
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