Self-curing systems
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsHerbert Wolter, Helma Baeuerlein
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Abstract
The invention relates to self-curing systems based on polymerizable and hydrolytically condensable or condensed silicon compounds. The systems according to the invention comprise one or more components which contain starter and/or activator systems, at least one component of the system containing a silicon compound of the formula I or Ia, or a precondensed form thereof, {X.sub.a R.sub.b SiR'(A).sub.c !.sub.(4-a-b) }.sub.x B (I) {X.sub.a R.sub.b Si(R'A).sub.c !.sub.(4-a-b) }.sub.x B (Ia) The invention furthermore relates to activators in the form of silane-bonded tertiary amines of the general formula IX or X. ##STR1##
Claims20
A self-curing system based on polymerizable and hydrolytically condensable or hydrolytically condensed silicon compounds, wherein said system required no thermal or radiation-induced photoinitiators for polymerization, comprising:
- A. an aromatic amine activator;
- and
- B. at least one silicon compound of the formula I or Ia,
- {X.sub.a R.sub.b SiR'(A).sub.c !.sub.--(4-a-b) }.sub.x B (I)
- {X.sub.a R.sub.b Si(R'A).sub.c !.sub.(4-a-b) }.sub.x B (Ia)
- or a hydrolytically precondensed form of said silicon compound,
- wherein the radicals and integers are identical or different and have the following meaning:
- A=O, S, PR", POR", NHC(O)O or NHC(O)NR",
- B=a straight-chain or branched organic radical which is derived from a compound B', said compound B' comprising at least 5 to 50 carbon atoms, and having at least two C.dbd.C double bonds, except when c=1 and A=NHC(O)O or NHC(O)NR" in which case compound B' COMPRISES at least one double bond,
- R=alkyl, alkenyl, aryl, alkylaryl or arylalkyl,
- R'=alkylene, arylene or alkylenearylene,
- R"=hydrogen, alkyl or aryl,
- X=hydrogen, halogen, hydroxyl, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR".sub.2,
- a=1, 2 or 3,
- b=0, 1 or 2,
- c=0 or 1,
- x=an integer, the maximum value of which corresponds to the number of double bonds in the compound B' minus 1, or equals the number of double bonds in the compound B', if c=1 and A represents NHC(O)O or NHC(O)NR";
- wherein said alkyl and alkenyl radicals are substituted or unsubstituted straight-chain, branched or cyclic radicals having from 1 to 20 carbon atoms, aryl is substituted or unsubstituted phenyl, naphthyl or biphenyl, and said alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl, alkylaryl, arylalkyl, arylene, alkylene and alkylenearyl radicals are derived form the alkyl and aryl radicals defined above.
Silanes of the general formula IX or X, ##STR18## in which the radicals have the following meaning:
- Ar=aryl;
- R*=alkylene having 1 to 10 C atoms,
- R+=alkylene having 0 to 10 C atoms,
- X=hydrogen, halogen, hydroxyl, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR".sub.2,
- X'=--OH, --NH.sub.2, --SH, --CH.dbd.CH.sub.2, --C(O)--O--C(O)--R.sup.--, ##STR19## R.sup.-- =alkyl with 1 to 10 C atoms, X"=--O--C(O)--NH--, --NH--C(O)--NH--, --S--C(O)--NH--, --O--CH.sub.2 --CHOH--, --NH--CH.sub.2 --CHOH--, --S--CH.sub.2 --CHOH--, --O--C(O)--, --NH--C(O)--, --S--C(O)--, --C.sub.2 H.sub.4 --, --C.sub.2 H.sub.4 --S--, --C.sub.2 H.sub.4 --NH--, --NH--C(O)--O--, --NH--C(O)--S--, --CHOH--CH.sub.2 --O--, --CHOH--CH.sub.2 --NH--, --CHOH--CH.sub.2 --S--, --C(O)--O--, --C(O)--NH--, or --C(O)--S--,
- wherein one or more of Ar, R*, R.sup.-- or R+ may be substituted.
A method of making a self-curing system comprising combining (i) an activator, and (ii) a precondensed form of at least one silicon compound of the formula I or Ia,
- {X.sub.z R.sub.b SiR'(A).sub.c !.sub.(4-a-b) }.sub.x B (I)
- {X.sub.a R.sub.b Si(R'A.sub.c !.sub.(4-a-b) }.sub.x B (Ia)
- in which the radicals and integers are identical or different and have the following meaning:
- A=O, S, PR", POR", NHC(O)O or NHC(O)NR",
- B=a straight-chain or branched organic radical which is derived from a compound B', said compound B' comprising at least 5 to 50 carbon atoms, and having at least two C.dbd.C double bonds, except when c=1 and A=NHC(O)O or NHC(O)NR" in which case compound B' comprises at least one double bond,
- R=alkyl, alkenyl, aryl, alkylaryl or arylalkyl,
- R'=alkylene, arylene or alkylenearylene,
- R"=hydrogen, alkyl or aryl,
- X=hydrogen, halogen, hydroxyl, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR".sub.2,
- a=1, 2 or 3,
- b=0, 1 or 2,
- c=0 or 1,
- x=an integer, the maximum value of which corresponds to the number of double bonds in the compound B' minus 1, or equals the number of double bonds in the compound B', if c=1 and A represents NHC(O)O or NHC(O)NR";
- wherein the above alkyl and alkenyl radicals are optionally substituted straight-chain, branched or cyclic radicals having from 1 to 20 carbon atoms, aryl represents optionally substituted phenyl, naphthyl or biphenyl, and the above alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl, alkylaryl, arylalkyl, arylene, alkylene and alkylenearyl radicals are derived from the alkyl and aryl radicals defined above.
Dependencies are inferred from the claim text.