Thio(Meth)Acrylates, Mixtures For Producing Transparent Plastics, Transparent Plastics And Method For Their Production And Use
The present invention relates to thio(meth)acrylates, obtainable via reaction of compounds of the formula (I) and (II) where each R 1 , independently of the others, is hydrogen or a methyl radical, each R 2 , independently of the others is a linear or branched, aliphatic or cycloaliphatic radical, or a substituted or unsubstituted aromatic or heteroaromatic radical, and each of m and n, independently of the others, is whole number greater than or equal to 0, where m+n>0, with thiol compounds which encompass at least two thiol groups.
1 . A thio(meth)acrylate, obtainable via the reaction of compounds of formula (I) and/or (II)
where each R 1 , independently of the others, is hydrogen or a methyl radical,
each R 2 , independently of the others, is a linear or branched, aliphatic or cycloaliphatic radical, or a substituted or unsubstituted aromatic or heteroaromatic radical, and each of m and n, independently of the others, is a whole number greater than or equal to 0, where m+n>0,
with thiol compounds which contain at least two thiol groups.
2 : The thio(meth)acrylate according to claim 1 , characterized in that the thiol compounds are alkyldithiols or polythiols.
3 : The thio(meth)acrylate according to claim 1 , characterized in that the thiol compounds are compounds of formula (III)
HS—R 3 —SH (III),
where R 3 is a linear or branched, aliphatic or cycloaliphatic radical or a substituted or unsubstituted aromatic or heteroaromatic radical.
4 : The thio(meth)acrylate according to claim 1 , characterized in that the molar ratio of compounds of formula (I) and/or (II) to the thiol compounds containing at least two thiol groups is in the range from 50:1 to 1:2.
5 : The thio(meth)acrylate according to claim 1 , characterized in that the mixture for preparing the thio(meth)acrylate comprises more than 5.8 mol %, based on the total amount of the compounds of formula (I), (II) and (III), of compounds of formula (II) where m+n=3.
6 : The thio(meth)acrylate according to claim 1 , characterized in that the mixture for preparing the thio(meth)acrylate comprises from 1 to 50 mol %, based on the total amount of the compounds of formula (I), (II) and (III), of compounds of formula (I).
7 : The thio(meth)acrylate according to claim 1 , characterized in that the mixture for preparing the thio(meth)acrylate comprises from 1 to 40 mol %, based on the total amount of the compounds of formula (I), (II) and (III), of compounds of formula (II) where m+n=1.
8 : The thio(meth)acrylate according to claim 1 , characterized in that the mixture for preparing the thio(meth)acrylate comprises compounds of formula (II) where m+n>3.
9 : The thio(meth)acrylate according to claim 1 , characterized in that the total content of compounds of formula (I), (II) and (III) is at least 5.0% by weight, based on the total weight of the mixture for preparing the thio(meth)acrylate.
10 : The thio(meth)acrylate according to claim 1 , characterized in that the mixture for preparing the thio(meth)acrylate comprises more than 10 mol %, based on the total amount of the compounds of formula (I), (II) and (III), of compounds of formula (II) where m+n=2.
11 : A thio(meth)acrylate comprising compounds of the formulae
A-Y-A (IV-a)
and/or
A-Y-Z-B (IV-b)
and/or
A-(Y-Z) q -Y-A (IV-c)
and/or
B-(Z-Y) r -Z-B (IV-d)
and/or
A-(Y-Z) s -B (IV-e)
where q, r and s are whole numbers in the range from 1 to 100,
A is an end group of the formulae
B is an end group of the formula
Z is a connecting group of the formulae
Y is a connecting group of the formulae
where
each R 1 , independently of the others, is hydrogen or a methyl radical,
each R 2 , independently of the others, is a linear or branched, aliphatic or cycloaliphatic radical, or a substituted or unsubstituted aromatic or heteroaromatic radical, and each of m and n, independently of the others, is a whole number greater than or equal to 0, where m+n>0, and
R 3 is a linear or branched, aliphatic or cycloaliphatic radical or a substituted or unsubstituted aromatic or heteroaromatic radical.
12 : The thio(meth)acrylate according to claim 1 , characterized in that the weight-average molecular weight of the thio(meth)acrylate is in the range from 300 to 5000 Da.
13 : The thio(meth)acrylate according to claim 11 , characterized in that the viscosity of the thio(meth)acrylate determined at 25° C. is in the range from 100 to 1000 mPa·s.
14 : The thio(meth)acrylate according to claim 11 , characterized in that the radical R 2 of formula (I), (II), (IV), (V) and/or (VII) is an aliphatic radical having from 1 to 10 carbon atoms.
15 : A mixture for preparing transparent plastics, comprising
a) at least one thio(meth)acrylate according to of claim 1 ,
b) at least one monomer (A) capable of free-radical polymerization and having at least 2 methacrylate groups and
c) at least one aromatic vinyl compound.
16 : The mixture according to claim 15 , comprising
d) a monomer capable of free-radical polymerization and having at least two terminal olefinic groups whose reactivity differs, and/or
e) at least one ethylenically unsaturated monomer (B).
17 : The mixture according to claim 15 , characterized in that the mixture comprises at least one monomer (A) which is copolymerizable with the thio(meth)acrylate.
18 : The mixture according to claim 17 , characterized in that the mixture comprises di(meth)acrylates.
19 : The mixture according to claim 15 , characterized in that the aromatic vinyl compound present in the mixture comprises styrene.
20 : The mixture according to at lest one claim 15 , characterized in that it comprises a monomer capable of free-radical polymerization and having at least two terminal olefinic groups whose reactivity differs, of the general formula
where
the radical R 19 is independently a hydrogen atom, a fluorine atom, and/or a methyl group,
the radical R 18 is a connecting group which preferably encompasses from 1 to 1000 carbon atoms, and
the radical Y is a bond or a connecting group having from 0 to 1000 carbon atoms.
21 : The mixture according to claim 20 , characterized in that it comprises allyl polyethylene glycol methacrylate.
22 : The mixture according to claim 15 , characterized in that the mixture comprises at least one (meth)acrylate.
23 : The mixture according to claim 22 , characterized in that it comprises 2-hydroxyethyl methacrylate.
24 : The mixture according to claim 15 , characterized in that the mixture comprises at least one photochromic dye.
25 : A process for preparing transparent plastics, characterized in that a mixture according to claim 15 is polymerized.
26 : A transparent plastic obtainable via a process according to claim 25 .
27 : The plastic according to claim 26 , characterized in that the refractive index of the plastic to DIN 53491 is greater than 1.59.
28 : The plastic according to claim 26 , characterized in that the Abbe number of the plastic to DIN 53491 is greater than 36.
29 : The plastic according to claim 26 , characterized in that the average diameter of the ball which does not damage the test specimen in the falling ball test is ≧18.
30 : The plastic according to claim 26 , characterized in that the transmittance of the plastic to DIN 5036 is ≧89%.
31 : The plastic according to claim 26 , characterized in that its glass transition temperature is greater than 80.0° C.
32 : The plastic according to claim 26 , characterized in that the plastic has photochromic properties.
33 : A lens or glass pane or glass inset composed of the plastic according to claim 32 .
34 : An optical lens comprising the transparent plastic according to claim 26 .
35 : An ophthalmic lens comprising the transparent plastic according to claim 26 .