Bayer aktiengesellschaft12/10/2023 ![]() Wherein R 1 is CH 2 -X CH-X 2 CH 3 R 2 is H CH 3 CH 2 -X CH-X 2 CX 3 and X is chlorine, bromine, iodine andĬ. Wherein R is hydrogen, alkyl having 1 to 4 carbon atoms, phenyl, benzyl or hydroxymethyl, X is hydrogen, alkyl having 1 to 4 carbon atoms, phenyl or trimethylsilyl with the proviso that R and X are not simultaneously hydrogen and R 1 and R 2 are each selected from the group consisting of hydrogen, alkyl having 1 to 4 carbon atoms, methoxy and halogen or 0.1 to 4.0 % by weight of a photoinitiator of the formula #SPC2# 0.1 to 4.0 percent by weight of a photoinitiator of the formula #SPC1# ![]() 0 to 30 percent by weight of a polyalcohol selected from the group consisting of ethylene glycol, propanediol-1,2, butanediol-1,3, butanediol-1,4, glycerine, trimethylolpropane, pentaerythritol, neopentyl glycol, cyclohexanediol-1,2, 2,2-bis-(p-hydroxycyclohexy)-propane and 1,4-bismethylolcyclohexane ī. 0 to 10 percent by weight of an acid selected from the group consisting of phthalic acid, adipic acid, terephthalic acid, malonic acid, tetrahydrophthalic acid, hexahydrophthalic acid, succinic acid, glutaric acid and norbonenedicarboxylic acid andĮ. ![]() 10 to 50 percent by weight of a monohydric or polyhydric alcohol containing saturated ether groups which is selected from the group consisting of diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, the monoalkyl ethers of said glycols having from 1 to 10 carbon atoms in said monoalkyl moiety, methyl, ethyl, propyl, butyl, iso-propyl, sec-butyl, t-butyl, n-pentyl, neo-pentyl, n-hexyl, iso-hexyl,ĭ. 10 to 30 percent by weight of a diallyl ether of a polyhydric alcohol, said alcohol being selected from the group consisting of trimethylolpropane, trimethylolethane, trimethylolbutane, pentaerythritol and glycerine,Ĭ. 30 to 50 percent by weight of α,β-unsaturated dicarboxylic acid,ī. 70 to 10 percent by weight of an unsaturated polyester which has an acid number of from about 5 to about 55 and is the condensation product at a temperature of from about 170° to about 200☌. It has now been found, surprisingly, that the choice of a particular component mixture in the manufacture of the unsaturated polyester resin mixture according to Deutsche Auslegeschrift (German Published Specification) 1,024,654 results in an unexpected increase in reactivity which is so great that the industrial use of light-curing, air-drying unsaturated polyester resin mixtures in irradiation installations, using extremely short cycle times, that is to say cycle times of 2 minutes or less, is no longer in question.Ī. This has hitherto stood in the way of their industrial application. Hitherto it has not been possible to make air-drying mixtures of unsaturated polyesters and copolymerisable momomers, which are described in the examples of Deutsche Auslegeschrift (German Published Specification) 1,024,654, so reactive that they can be processed using the extremely short cycle times of the polyesters containing paraffin. It has thus proved possible to achieve extremely short cycle times in processing. The latter should be distinguished as being particularly active.Īn improved process variant for the curing of the polyesters is characterised, according to Deutsche Auslegeschrift (German Published Specification) 1,694,149, in that mixtures of unsaturated polyesters and copolymerisable monomers are irradiated with UV-light, with the addition of certain benzoin compounds, and can hence be cured in an extremely short time.įor some years, large-scale industrial irradiation equipment has existed, by means of which coatings of mixtures of unsaturated polyester resins and copolymerisable monomers, containing paraffin, can be cured within 2 minutes. Examples of such photoinitiators are, inter alia, sulphur compounds, for example O-alkylxanthogenic acid esters which are activated in the β-position to the sulphur atom by a double bond, aromatic disulphides and thioethers containing aromatic groups certain halogen compounds, as well as benzoin and its derivatives. According to these disclosures, so-called photoinitiators as a rule serve as the auxiliaries which initiate the polymerisation. Numerous other treatises describe processes in which mixtures of unsaturated polyesters with copolymerisable monomeric compounds can be cured by means of UV-light. The characterising feature of the unsaturated polyesters disclosed therein is that they contain α,β-unsaturated carboxylic acid esters and β,γ-unsaturated ether radicals. The present invention relates to new unsaturated polyesters and to their use in air-drying, light-curing, moulding and coating compositions.ĭeutsche Auslegeschrift (German Published Specification) 1,024,654 discloses mixtures of unsaturated polyesters and copolymerisable monomeric compounds which, with the addition of auxiliaries, can be catalytically cured in air to give dry mouldings and/or coatings.
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