Joachim E. Klee

Joachim E. Klee

Prof.Dr.
Consultant

About

200
Publications
20,059
Reads
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1,431
Citations
Additional affiliations
February 2019 - present
IPCON Chem
Position
  • Consultant
Description
  • Polymer Chemistry Patent Management
January 2009 - present
Die Mathematisch-Naturwissenschaftliche Fakultät
Position
  • Heinrich-Heine-Universität Düsseldorf
Description
  • Polymere und Licht
September 1993 - August 2008
Fachbereich Chemie
Position
  • University Konstanz
Description
  • Lectures Polymer chemistry, polymers basis of new technologies, mass spectroscopy of polymers

Publications

Publications (200)
Article
Many academic and industrial works have been carried out for the search of new classes of visible light photoinitiators (PI). This last decade, new Type I photoinitiator generating silyl, germyl or stannyl radicals were elegantly reported; the chemical mechanisms being often associated with the cleavage of the C( = O)‐Si, C( = O)‐Ge or C( = O)‐Sn b...
Article
Full-text available
Aliphatic cyclic carbonate monomers (CCs) with two or three functional groups and low viscosity were synthesized by solvent-free catalytic transcarbonylation of oxiranes and carbon dioxide with high conversions at atmospheric pressure. Aminolysis of the CCs yielding polyhydroxyurethanes (PHUs) was studied by rheology. For this, different di- and tr...
Patent
Full-text available
It is the problem of the present invention to provide a dental composition comprising an acidic polymerizable compound copolymerizable with conventional polymerizable compounds such as (meth)acrylates, (meth)acrylamides and allylic ethers, and which compound provides an excellent adhesion to hard dental tissue including dentine and enamel, and very...
Patent
Full-text available
Dental root canal filling composition comprising (a) one or more diepoxides; (b) one or more primary monoamines and/or disecondary diamines; (c) a particulate filler, wherein the one or more diepoxides are selected from compounds of the following formula (I) or a salt thereof: EP 3 721 858 A1 2 5 10 15 20 25 30 35 40 45 50 55 Description Field of t...
Patent
Full-text available
The present invention relates to a process for the preparation of a dental resin-modified glass ionomer composition. According to the present invention, a polymerizable linear polyacidic acrylic polymer having polymerizable pendant groups linked to the acrylic polymer backbone by amide groups may be conveniently and efficiently obtained at a high m...
Patent
Full-text available
Dental root canal filling composition comprising (a) one or more diepoxides; (b) one or more primary monoamines and/or disecondary diamines; (c) a particulate filler.
Patent
Full-text available
A method of forming a dental composite includes photopolymerizing a dental composition. The dental composition includes a free-radically polymerizable (meth)acrylate resin, 75 percent by weight or greater of filler particles, and about 0.005 percent to about 5 percent by weight of at least one polymerizable stable radical. The photopolymerizing for...
Article
A new phosphine is proposed as efficient coinitiator for camphorquinone (CQ)‐based photoinitiating systems for the free radical polymerization of (meth)acrylates. Remarkably, this new co‐initiator can exhibit two functionalities: a phosphine moiety to overcome oxygen inhibition and an iodonium salt moiety as counter cation to initiate the polymeriz...
Article
2‐Oxo‐2‐(tert‐butyldimethylsilyl)acetic acid (DKSi‐COOH), is proposed here as a new high‐performance photoinitiator (PI) for the free radical polymerization of methacrylates under blue light irradiation. In the presence of DKSi‐COOH, very good polymerization performances are reached and outstanding bleaching properties are obtained compared to trad...
Article
Purpose: The aim of this review article was to provide an overview of the scientific and patent literature on the different synthesis pathways of modified polyacids suitable for application in a new class of restorative dental materials. Methods: The literature based on patents and publications from 2009 to 2018 of Dentsply Sirona in cooperation...
Article
Objective: The aim of our study is to develop amine-free photoinitiating systems (PISs) for the polymerization of representative dental methacrylate resins under blue light irradiation. PISs based on camphorquinone (CQ)/sulfinate and CQ/sulfonate, eventually in combination with an iodonium salt, are proposed and compared to the well-established CQ...
Article
1‐Aryl‐2‐(triisopropylsilyl)ethane‐1,2‐diones (SEDs) are proposed here as a new class of visible Type I photoinitiators (PIs) for free radical polymerization under air upon exposure to blue (@455 nm) and green (@520 nm) LEDs. Remarkably, these new systems present good polymerization performances and excellent bleaching properties compared to campho...
Article
Full-text available
Diaryliodonium salts are well-established compounds in free radical chemistry and are already used as photoinitiators (free radical or cationic polymerization), but the presence of counter anions is a strong drawback. Indeed, a counter anion is always required (e.g., SbF6−) leading to potential toxicity issues or release of HF. In the present paper...
Patent
Full-text available
The present invention relates to an aqueous dental composition having a pH of at most 7. Furthermore, the present invention relates to the use of a specific composition for the preparation of an aqueous dental composition. The aqueous dental composition according to the present invention may be a one-part dental composition. The aqueous dental comp...
Patent
Full-text available
The present invention relates to a dental composition comprising a specific polymerizable acidic compound. The present invention also relates to the use of the specific polymerizable acidic compound for the preparation of a dental composition
Article
Iodonium sulfonates are proposed here as a new class of high‐performance coinitiators for camphorquinone (CQ)‐based systems for the polymerization of methacrylates under blue light irradiation. When combined with CQ, the new proposed coinitiators present excellent polymerization performances and are excellent candidates for the replacement of terti...
Patent
Full-text available
The present invention relates to a dental impression material adapted to be cured by visible light, comprising a compound having one or more aliphatic unsaturated groups, a compound containing at least one silicone-bonded hydrogen atom and not having more than three hydrogen atoms attached to any one silicone atom, a photoactivatable catalyst compo...
Patent
Full-text available
The present invention relates to an initiator modified polyacidic polymer having a covalently bonded initiator compound, and to a dental resin-modified glass ionomer composition comprising this polyacidic polymer. Furthermore, the present invention relates to a use of the initiator modified polyacidic polymer for the preparation of a dental composi...
Patent
Full-text available
The present invention relates to a dental composition comprising a photoinitiator system comprising a particulate carrier supporting a coinitiator covalently bonded to the surface of the carrier. Furthermore, the present invention relates to a use of the particulate carrier in a dental composition. The particulate carrier displays multiple covalent...
Patent
Full-text available
The present invention relates to a dental composition comprising an acidic polymerizable compound of the following formula (I): (X)m(Y)nCyc-Z-L-NR1R2 (I) wherein X, Y, Cyc, Z, L, R1, R2, m and n are as defined in claim 1. Furthermore, the present invention relates to the use of the polymerizable compound of formula (I) for the preparation of a dent...
Patent
Full-text available
The present invention relates to a photocurable dental composition comprising a specific polymerization initiator system containing the combination of a photoinitiator compound and a coinitiator compound being a sulfinate compound or a sulfonate compound. The present invention also relates to the use of this polymerization initiator system in a pho...
Patent
Full-text available
The present invention relates to a dental composition containing a polymerizable composition containing a compound having repeating units which are reactive in a radical polymerization. Moreover, the present invention relates to a process for the preparation of a polymerizable composition for use in a dental composition. The present invention also...
Patent
Full-text available
The present invention relates to a process for the preparation of a dental resin-modified glass ionomer composition comprising a polymerizable polyacidic polymer obtained by modification of polyacidic polymers with polymerizable compounds containing an amino group and/or an isocyanato group.
Patent
Full-text available
Disclosed herein is a dental composition having a polymerization initiator system with an aromatic tertiary phosphine compound. Further disclosed is the use of the aromatic tertiary phospine compound for the preparation of a photocurable dental compositions.
Patent
Full-text available
The present invention relates to a dental composition comprising a radically polymerizable compound and a redox initiator system comprising one or more clathrate compounds comprising a host molecule and one or more guest molecules, wherein the guest molecule is an oxidising agent selected from organic peroxides and organic hydroperoxides. Furthermo...
Patent
Full-text available
A temporary root canal sealer dispersion having a pH of at least 9 and comprising: (i) an aqueous dispersion medium comprising an oligomer and/or polymer having Lewis basic groups, and optionally a hydroxide of an alkali metal and/or a hydroxide of an alkaline earth metal, and (ii) a dispersed phase comprising a radio-opaque filler, wherein the wei...
Patent
Full-text available
The present invention relates to a dental composition comprising (i) an acidic polymerizable compound of the following formula (la), (lb) (Ic) wherein X, Y, Y', Z, L, R2, R3 and R4 are as defined in claim 1; and (ii) an initiator system. Furthermore, the present invention relates to the use of the polymerizable compound of formula (I) for the prepa...
Patent
An aqueous dental glass ionomer composition comprising (A) a reactive particulate glass, (B) a water-soluble polymer comprising acidic groups, which is reactive with the particulate glass in a cement reaction, (C) a water-soluble, hydrolysis-stable monomer having a single polymerizable double band and optionally a carboxylic acid group or hydroxyl...
Patent
Full-text available
Dental composition comprising (a) a homogeneous phase comprising monomer combinations (i) and (ii), (i) and (iii), (ii) and (iii), or (i), (ii) and (iii), or comprising monomer (iii), wherein (i) represents one or more compounds having one or more radically polymerizable carbon-carbon double bonds; (ii) represents one or more compounds having one o...
Patent
Full-text available
The present invention relates to an aqueous dental glass ionomer composition comprising (A) a reactive particulate glass, (B) a water-soluble, polymerizable polymer comprising acidic groups, which is reactive with the particulate glass in a cement reaction, whereby the polymerizable polymer has a polymer backbone and pendant groups having one or mo...
Article
Full-text available
Silyl glyoxylates are proposed here as a new class of high performance type I photoinitiators for free radical polymerization under air or in laminate (e.g., (meth)acrylates) upon exposure to different near-UV (at 395 nm; at 405 nm) and blue (at 477 nm) LEDs. The new proposed photoinitiators can also be used in the presence of additives that can en...
Patent
Full-text available
The present invention relates to a dental composition comprising a specific polymerization initiator system comprising a compound having an acylsilyl- or acylgermanyl-group. The present invention also relates the use of the compound having an acylsilyl- or acylgermanyl-group for the preparation of a dental composition.
Patent
Full-text available
The present invention relates to a polymerizable polyacidic polymer and to a process for preparing the polymerizable polyacidic polymer. Furthermore, the present invention relates to an aqueous dental composition comprising the polymerizable polyacidic polymer, to a use of the polymerizable polyacidic polymer for the preparation of a dental composi...
Patent
Full-text available
The present invention relates to an aqueous dental glass ionomer composition comprising (A) a reactive particulate glass, (B) a water-soluble, polymerizable polymer comprising acidic groups, which is reactive with the particulate glass in a cement reaction, whereby the polymerizable polymer has a polymer backbone and hydrolysis-stable pendant group...
Patent
Full-text available
The present invention relates to a dental composition comprising a specific radically polymerizable compound and a radical initiator system. Furthermore, the present invention relates to the specific radically polymerizable compound and its use in a dental composition. The specific radically polymerizable compound of the present invention has an al...
Patent
Full-text available
The present invention relates to a dental adhesive composition having bactericidal activity and high storage stability prior to curing and having and bacteriostatic activity when cured, while providing high mechanical resistance and high adhesion over the entire lifetime of the restoration after curing. The dental adhesive composition of the presen...
Patent
Full-text available
Tue present invention relates to a dental composition comprising a polymerization initiator system comprising an aromatic tertiary phosphine compound, as well as to a use of said aromatic tertiary phosphine compound for the preparation of a photo - curable dental composition.
Article
A new photoinitiator based on a bis-silylketone (BSK) structure is proposed as a novel compound leading to highly efficient initiating silyl radicals for the polymerization of methacrylates (e.g., a bisphenol A-glycidyl methacrylate/triethyleneglycol dimethacrylate blend (70%/30% w/w)) upon exposure to a blue light emitting diode and a green laser...
Article
The objectives of this work is to propose a novel low migration additive (i.e. a phosphine) to overcome the oxygen inhibition in camphorquinone CQ base photoinitiating system for the polymerization of methacrylates (e.g. a bisphenol A-glycidyl methacrylate (Bis-GMA)/triethyleneglycol dimethacrylate (TEGDMA) blend (70%/30% w/w)) upon exposure to a c...
Article
Full-text available
Objectives: The aim of our study is to find an amine free photoinitiating system (PIS) for the polymerization of representative dental methacrylate resins. A photoinitiating system (PIS) based on camphorquinone (CQ)/triphenylgermanium hydride/diphenyl iodonium hexafluorophosphate is proposed and compared to the conventional CQ/amine couple. The po...
Patent
Full-text available
The present invention relates to a dental cement composition comprising a post-polymerizable polyacidic polymer having specific repeating units in the polymer backbone.
Article
Poly(acrylic acid)s (PAAs) with curable methacrylamide moieties as well as bisacrylamide crosslinkers are described as components for well-defined hydrogels with increased hydrolytic resistance. PAAs with tethered curing moieties of different alkyl spacer lengths (−(CH2)n−, n = 2, 3, 6 or 8) were prepared via copolymerization of one-sided methacryl...
Patent
Full-text available
The present invention provides a dental composite comprising BPA-free macromonomers.
Patent
Full-text available
Dental obturator point having an obturation body containing a composite material comprising (a) a polymer and b) a particulate filler, whereby the obturation body has a radio opacity of at least 3 mm/mm AI, characterized in that the composite material has (i) a tensile strength of from 5 to 70 MPA (ii) a flexural strength of from 5 to 90 MPA, (iii)...
Patent
Full-text available
Dental composition comprising (a) one or more di- or polyepoxides having 2 to 5 epoxide groups and having a molecular weight of from 200 to 700 Da, or a macromonomeric reaction product obtainable by reacting the diepoxide with a dicarboxylic acid in a molar ratio [diepoxide]/[dicarboxylic acid] of at least 2; (b) one or more primary monoamines and/...
Patent
Full-text available
Dental composition comprising (a) one or more di- or polyepoxides having 2 to 5 epoxide groups and having a molecular weight of from 200 to 700 Da, or a macromonomeric reaction product obtainable by reacting the diepoxide with a dicarboxylic acid in a molar ratio [diepoxide]/[dicarboxylic acid] of at least 2; (b) one or more primary monoamines and/...
Patent
Full-text available
Dental composition comprising a watersoluble polymerizable compound of the following formula (1): wherein A is a linear or branched linker group represented by the following formula (3), wherein the nitrogen atom of at least two of the termini forms an amide bond with an X moiety; wherein R' represents a hydrogen atom or a substituted or unsubstitu...
Patent
Full-text available
An aqueous dental glass ionomer composition comprising (a) a reactive particulate glass, and (b) a linear or branched polymer comprising acidic groups, which is reactive with the particulate glass in a cement reaction, whereby the linear or branched polymer comprising acidic groups has a polymer backbone and optionally pendant side chains, (c) opti...
Patent
Full-text available
Abstract: (i) 5 to 80 percent by weight based on the total weight of the composition of a polymerizable matrix containing polymerizable monomers; (ii) a polymerization initiator system containing (a) an alpha-diketone photoinitiator compound having a light absorption maximum in the range from 300 to 500 nm; (b) a coinitiator compound of the followi...
Article
The camphorquinone (CQ)/amine and CQ/diphenyl (2,4,6‐trimethylbenzoyl)‐phosphine oxide (TPO)/amine photoinitiating systems (PISs) are largely used in the area of dental resins, but the role of the light source in connection with the excited state processes has not been deeply investigated so far. Here, a state‐of‐the‐art analysis on the photochemis...
Patent
Full-text available
Dental composition comprising (i) 5 to 80 percent by weight based on the total weight of the composition of a polymerizable matrix containing polymerizable monomers; (ii) a polymerization initiator system containing (a) an alpha-diketone photoinitiator compound having a light absorption maximum in the range from 300 to 500 nm; and (b) a coinitiator...
Chapter
The development of the first ultraviolet (UV) light-cured dental composites in the early 1960s marked a milestone in dentistry that facilitated further discoveries in dental restorative and adhesive technology. Light-cured composites were superior to the preceding two-component, selfcured restoratives due to improved physical as well as handling pr...
Patent
Full-text available
One-component heat-curable sealant composition for the protection of exposed dental surfaces, comprising (a) a polymerizable monomer and/or oligomer which has at least two polymerizable double bonds per molecule, and (b) an initiator system comprising benzoylperoxide in an amount of at least 2 wt.-% based on the total composition.
Patent
Full-text available
Dental adhesive composition having a pH of at least 5, which comprises an aqueous solution containing (a) a polymerizable N-substituted alkyl acrylic or acrylic acid amide monomer; (b) a water-soluble polymerizable carboxylic acid; and (c) a water-soluble organic solvent.
Patent
Full-text available
A temporary root canal sealer composition, comprising based on the total weight of the composition: (a) 0.5 to 40 wt% of a water-soluble polymer having an average molecular weight of from 5000 to 100,000; (b) 20 to 40 wt% of a particulate inorganic radioopaque fiiier; (c) 0.01 to 5 wt.% of an alkali resistant particulate filler having an average pa...
Article
Acrylic acid copolymers bearing radically polymerizable methacrylic and itaconic moie-ties are synthesized. Starting from copolymers of tBA and APVE, prepared at different ratios, methacrylic or itaconic amides are obtained via polymer-analogous reaction. After acidic elimination of isobutylene, polymers with free carbon acids and staggered reactiv...