Technical Library

These materials, characterized by a combination of cycloaliphatic and siloxane structures, have outstanding weathering characteristics, controlled release and coefficient of friction and excellent electrical properties. They can be cured either by cationic UV photoinitiators or conventional epoxy hardeners. In cationic UV-cure systems the cycloaliphatic epoxy silicones combine the properties of reactive diluents with surfactant properties. The release properties can be employed to make parting layers for multilayer films. If high levels of epoxy functional silicones are used in UV cure formulations, cationic photoinitiators with hydrophobic substitution are preferred.

Difunctional Siloxanes

Product CodeStructureNameMolecular WeightBP/mm (MP) (°C)Density
D420
Refractive Index
nD20
CommentsCAS
SIB1092.0bis[2-(3,4-epoxycyclohexyl)ethyl]-tetramethyldisiloxane382.69(-34)0.9981.4758flashpoint: 200 °C
viscosity: 40 cSt
UV-initiated polymerization with weak acid donors
[18724-32-8
TSCA

Epoxycyclohexylethyl-Terminated Polydimethylsiloxanes, CAS: [102782-98-9], TSCA

Product CodeViscosity (cSt)Molecular WeightEpoxy (eq/kg)Refractive IndexDensity
DMS-EC1325-35900-1,0001.9-2.01.4330.99
DMS-EC1760-803,200-3,6000.5-0.71.4120.98
DMS-EC31800-1,20040,0000.04-0.061.4100.98
see also [button skus="SIB1092.0"]SIB1092.0[/button]

(Epoxycyclohexylethylmethylsiloxane)-Dimethylsiloxane Copolymers, CAS: [67762-95-2], TSCA

Product CodeViscosity (cSt)Molecular WeightEpoxy (eq/kg)Refractive IndexDensity
MCR-E11500-1,20012,000-15,0001-21.4070.98
MCR-E11650-80018,000-20,0002-31.4070.98
MCR-E11350-85018,000-20,0003-41.4090.99
MCR-E11300-45010,000-12,0008-101.4210.97

(2-3% Epoxycyclohexylethylmethylsiloxane)(10-15% Methoxypolyalkyleneoxymethylsiloxane)-(Dimethylsiloxane) Terpolymer, CAS: [69669-36-9], TSCA

Product CodeViscosity (cSt)Molecular WeightEpoxy (eq/kg)Refractive IndexDensity
EBP-2344,000-5,00025,000-36,0000.75-0.801.4451.03

(Epoxypropoxypropylmethylsiloxane)-(Dimethylsiloxane) Copolymer, CAS: [68440-71-7], TSCA

Product CodeViscosity (cSt)Molecular WeightEpoxy (eq/kg)Refractive IndexDensity
EMS-622200-3007,000-9,0005-71.4120.99

Gelest offers cationic and long-wavelength UV initiators that are hydrophobic and soluble in silicone systems.

Photoinitiators

Product CodeStructureNameMolecular WeightBP/mm (MP) (°C)Density
D420
Refractive Index
nD20
CommentsCAS
OMAN076(thophenoxyphenyl)diphenylsulfoniumhexafluoroantimonate bis(bis(dip[henysulfonium)diphenylthio)ether hexafluoroantimonate blend, 50% in propylene carbonate607.28(145)4.10--amber liquid
UV initiator for cationic polyerizations (e.g. cycloaliphatic epoxides)
[71449-78-0]/[89452-37-9]
TSCA
OMAN071p-(octyloxyphenyl)phenyliodonium-hexafluoroantimonate645.07(57-58)------[121239-74-5]
TSCA
OMBO037(p-isopropylphenyl)(p-methylphenyl)-iodonium tetrakis(pentafluorophenyl)borate1,015.7120-133----UV max: 235nm
UV initiator for cycloaliphatic epoxide-functionalized silicones
[178233-72-2]
TSCA
OMTI014bis(2,6-difluoro-3-(1-hydropyrrol-1-yl)phenyl)titanocene534.4(160-170)----color: orange-yellow
soluble: acetone, methylethylketone, >hexanediol diacrylate, toluene
visible (blue-green) light and UV photoinitiator
long wavelength photoinitiator with Al- (488nm) and FD Nd/YAG- (532nm) lasers
store <5 °C
[12051-32-3]
TSCA