Method for producing acylphosphine oxide solids
AssigneeBASF Akiengesellschaft
InventorsGerhard Bertlein, Karl Schall, Matthias Maase, Jorg Heilek, Dieter Baumann, Hermann Ascherl
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Abstract
The present invention relates to a process for the preparation of solid acylphosphine oxides by converting an acylphosphine oxide which is in the form of a melt or in dispersed form into the solid state of aggregation with mechanical stress, shearing/internal agitation of the melt.
Claims10
1) A process for the preparation of acylphosphine oxide solids with melting points above room temperature, which comprises converting the acylphosphine oxide present following reaction or work-up as a continuous melt phase or disperse melt phase into the solid state of aggregation with externally exerted mechanical stress, shearing and/or internal agitation of the melt.
4) A process as claimed in any of the present claims, wherein the mechanical stress of the melt is caused by stirring, pumping, knife coating, scratching, treatment with ultrasound or a stream of gas, which is passed through the melt or directed onto its surface.
5) A process as claimed in any one of the preceding claims, wherein the melt is mixed with a solid.
6) A process as claimed in any of the preceding claims, wherein the melt is mixed with a liquid in which the melt is soluble in an amount of not more than 10% by weight.
9) A process as claimed in any of the present claims, wherein the acylphosphine oxide is one of the formula (I)
- in which
- R1, R2 and R3, independently of one another, are C1-C18-alkyl, C2-C18-alkyl optionally interrupted by one or more oxygen and/or sulfur atoms and/or one or more substituted or unsubstituted imino groups, C2-C18-alkenyl, C6-C12-aryl, C5-C12-cycloalkyl or a five- to six-membered heterocycle having oxygen, nitrogen and/or sulfur atoms, where said radicals can each be substituted by aryl, alkyl, aryloxy, alkyloxy, heteroatoms and/or heterocycles, and
- R2 and R3, independently of one another, may additionally be hydroxy, C1-C18-alkoxy optionally substituted by aryl, alkyl, aryloxy, alkyloxy, heteroatoms and/or heterocycles, or R1—(C═O)—.
10) A process as claimed in any of the present claims, wherein the acylphosphine oxide is chosen from the group consisting of 2,4,6-trimethylbenzoyldiphenyl-phosphine oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide and bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide.
Dependencies are inferred from the claim text.