Preparation for the anti-adhesive coating of baking tins, baking moulds, pans, metal pots and the like

摘要

1. Formulation for the non-stick coating of baking trays, baking tins, pans, metal pots and the like, which predominantly consists of heat-curable polysiloxane resins and linear siloxanes which are reactive with the former, characterized in that it contains, as the heat-curable siloxane resin, a resin which is obtainable by reacting siloxanes of the general formula see diagramm : EP0017958,P6,F1 in which OR**5 is an alkoxy group of primary or secondary aliphatic alcohols having 1 to 4 C atoms, R**6 is an alkyl radical and/or phenyl radical, a has a value from 1.0 to 1.5 and b has a value from 0,1 to 0.7, with low-molecular polyhydric alcohols at temperatures from 100 to 160 degrees C, if appropriate in the presence of solvents and transesterification catalysts known per se, with removal of the alcohol R**5OH, in such a quantitative ratio that approximately one COH group corresponds to one SiOR**5 group, and stopping the reaction at a degree of conversion of from 25 to 80 % by cooling to a temperature of 100 degrees C, and contains, as the reactive linear polysiloxane, a polysiloxane of the formula see diagramm : EP0017958,P7,F2 wherein R**1 and R**2 are identical or different and denote a methyl or phenyl radical, with the proviso that at least 80 mol % of these radicals are methyl radicals, the R**3 are identical or different or different and have the meaning of one radical or several radicals from the group comprising a) alkyl radicals having 1 to 4 carbon atoms, b) phyenyl radicals, c) radicals which are capable of reacting with those groups of the curable polysiloxane resin which are capable of condensation, at least one radical R**3 having the meaning of c), and x is 0 or a number 0, in quantities from 0.05 to 4 % by weight, relative to silicone resin.