Compositions comprising chlorine-free, optionally hydrogen-containing fluorocarbons
AssigneeSolvay Fluor und Derivate GmbH
InventorsHans Buchwald, Joachim Hellmann, Boleslaus Raszkowski
Life of this patent
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Abstract
Compositions which are liquefied under pressure, are suitable as release agents and comprise a fluorocarbon (FC) from the group comprising R134a, R143a, R125, R32, R143, R134, R23, R152a, R14 and R116 and an agent having a releasing action and, if appropriate, other additives, customary for release agents are described; the compositions with the hydrogen-containing fluorocarbons (HFC) mentioned are preferred here. The use of the compositions as release agents and a process for their preparation are likewise described.
Claims19
A composition which is liquefied under pressure and comprises:
- at least one fluorocarbon selected from the group consisting of 1,1,1,2-tetrafluoroethane (R134a), 1,1,1-trifluoroethane (R143a), pentafluoroethane (R125), difluoromethane (R32), 1,1,2-trifluoroethane (R143), 1,1,2,2-tetrafluoroethane (R134), trifluoromethane (R23), 1,1-difluoroethane (R152a), tetrafluoromethane (R14) and hexafluoroethane (R116);
- and
- an agent having a releasing action which is selected from the group consisting of
- a) waxy esters containing a total of 34 to 50 carbon atoms formed from long-chain carboxylic acids and monoalcohols, sulfochlorinated or sulfidized derivatives thereof, derivatives thereof obtained by hydrogenation, and derivatives thereof obtained by hydrogen fluoride treatment;
- b) paraffin wax or a synthetic wax;
- c) polyethylene wax or an oxidized polyethylene wax;
- and
- d) a metal soap of magnesium, calcium, zinc, aluminum or lead.
A method of promoting separation between a shaping tool and an article formed to a desired shape by said tool, said method comprising
- coating said tool with a release agent composition which is liquefied under pressure and comprises an agent having a releasing action which is selected from the group consisting of
- a) waxy esters containing a total of 34 to 50 carbon atoms formed from long-chain carboxylic acids and monoalcohols, sulfochlorinated or sulfidized derivatives thereof, derivatives thereof obtained by hydrogenation, and derivatives thereof obtained by hydrogen fluoride treatment;
- b) paraffin wax or a synthetic wax;
- c) polyethylene wax or an oxidized polyethylene wax;
- and
- d) a metal soap of magnesium, calcium, zinc, aluminum or lead;
- and at least one fluorocarbon selected from the group consisting of 1,1,1,2-tetrafluoroethane (R134a), 1,1,1-trifluoroethane (R143a), pentafluoroethane (R125), difluoromethane (R32), 1,1,2trifluoroethane (R143), 1,1,2,2-tetrafluoroethane (R134), trifluoromethane (R23), 1,1-difluoroethane (R152a), tetrafluoromethane (R14) and hexafluoroethane (R116);
- and
- evaporating said at least one fluorocarbon prior to forming said article to the desired shape.
A process for preparing a release agent composition comprising forming a solution or dispersion comprising:
- at least 15% by wt. of a fluorocarbon selected from the group consisting of 1,1,1,2-tetrafluoroethane (R134a), 1,1,1-trifluoroethane (R143a), pentafluoroethane (R125), difluoromethane (R32), 1,1,2-trifluoroethane (R143), 1,1,2,2-tetrafluoroethane (R134), trifluoromethane (R23), 1,1 -difluoroethane (R152a), tetrafluoromethane (R14) and hexafluoroethane (R116), and mixtures thereof;
- from 0.1 to 40% by weight of an agent having a releasing action which is selected from the group consisting of
- a) waxy esters containing a total of 34 to 50 carbon atoms formed from long-chain carboxylic acids and monoalcohols, sulfochlorinated or sulfidized derivatives thereof, derivatives thereof obtained by hydrogenation, and derivatives thereof obtained by hydrogen fluoride treatment;
- b) paraffin wax or a synthetic wax;
- c) polyethylene wax or an oxidized polyethylene wax;
- and
- d) a metal soap of magnesium, calcium, zinc, aluminum or lead;
- 0 to 80% by weight of a solubilizing agent;
- 0 to 1% by weight of a stabilizer;
- and
- 0 to 1% by weight of a corrosion inhibitor, for a total of 100% by weight.
Dependencies are inferred from the claim text.