DE1544780C - Manufacture of food-repellent coatings on cookware and bakeware - Google Patents

Description

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It has been known for many years that organosiloxanes in terms of curing time and curing temperature

good mold release agents for bread and for other baking coatings, which according to Example 1 despite the addition of a

were are. For this purpose, siloxanes are generally used as a hardening accelerator

when applied to the pan or other cooking vessel, be 2 hours and 218 ° C.

and then by heating to form resinous coatings. The invention now relates to the use

hardened. Food that, when heated, with such resinous coating compositions on organopoly-

hardened resin film come into contact, let siloxane base easily applied by the housewife

can easily be removed from the cooking vessel without the cooking vessel being able to be applied and hardened

to do this, the use of organic fats and the use of all types of food that is heated

is manoeuvrable. · This finding led to a de- ίο should be to show a good separating effect. Further

outgoing improvement in large bakeries, and the cooking vessels can easily get charred fat

presently most of the United States and other organic products commonly used

States baked breads in with organopolysiloxane incurred during the cooking and baking process, cleaned

baked containers coated with resin. and the covers can easily be removed by yourself.

While the listed resin coatings are upgraded to Siloxane 15 when they are damaged, namely

Basis used successfully in large bakeries by simply reapplying the release agent

they pointed to the damaged areas when in use,

normal household no satisfactory result- According to the invention, therefore, mixtures of
nits. One of the reasons for this is that the

above-mentioned resinous organopolysiloxane over- 20 1. 10 to 35% based on the total weight

trains are quite difficult to harden. This plays out from (1) and (2), liquid methylpolysiloxanes

Although it does not matter in large bakeries, the diamonds with a hydroxyl group content of at least

Cutting house wife has neither 2 percent by weight for household use,

Time nor inclination necessary Härtungsvor- _{z 65 to 9Q0 /} ■ _{beZQ s a (jf the total weight} gange execute. In addition, the commercial 25 are _{yon (1) and (2))} and phenyl- _harzarti geharzart.gen Organopolys.loxanuberzuge in the on - enenfalls _give alkyl-substituted polysiloxanes with application to certain foods limited, _a hydroxyl group content of at least in which they allow a satisfactory separation from the 3 _{percent by weight> ei} ^ _em ratio of phenyl-surface. They _{will si} almost ausschheßlich _{res {s. Oven of at least} 0.2: 1 and used to detach loaves of bread rolls or a _certain ratio of all existing coal duck baked goods. For these reasons, hydrogen residues to Si atoms of 1.2 to 1.7: 1 are mold release coatings for household use
desirable that are easy to harden once and for

others a mold-releasing effect of the most diverse 3.tin salts of carboxylic acids, which with (1) and (2)

Types of food allow. . 35 are compatible, in amounts that to 150 ge

From U.S. Patent 2,462,242 it is also an important part of the total weight of 1 and 2

known, instead of organic fats for near- at least 1 part by weight of tin is available,

funds. To use silicone grease. This method .

however, suffers from the common disadvantage that it is repellent to food production

only. one type of fat is replaced by another, and 40 coatings are used on cookware and bakeware,

Although silicone greases are thermally stable, they form the specified minimum limit for the hydroxyl

but no permanent film on the surface of the group content of the constituents (1) is

Cooking vessel and must therefore be decisive after cleaning for the intended purpose,

the same can be reapplied over and over again. since liquid methylpolysiloxanes with less hydroxyl

From US Pat. No. 2,793,197, 45 groups are still ineffective. Such methyl poly known as a detachment from food siloxanes are commercially available products which can be produced by using a mixture of an elastomeric, conventional manner, an organopolysiloxane coating and a liquid. These liquid products can be linear or organopolysiloxane. However, the main branched structure and any combination disadvantage of this process lies in the fact that those of units of the formula
like coatings due to the absorption of oils and

Fats from the food in the film rapidly (CH ₃ ) _n Si0 ₄ _ _n

destroyed, and if the film is damaged,. ~ T ~ '

it no longer shows any separating effect. ' . -

Finally, from British patent specification 843 074 55 where η = 1, 2 or 3 and limited amounts of

It is known, food repellent coatings include SiO _4/2 units.

for baking appliances using mixtures of The resinous components (2) must be replaced by phenylmethylpolysiloxane resins, liquid hydroxyl. an average of at least 0.2 phenyl residues per Si atom and group-containing Phehylrhethylsiloxanen and an average of 1.2 to 1.7 organic residues contain liquid hydroxyl-free methylsiloxanes 60 per Si atom, whereby all existing organic must be produced, tin salts are also seen as hardening agents; residues phenyl residues be körinen; Combinations can be added. The production of such phenyl residues and other hydrocarbon coatings is, however, left with considerable effort, such as methyl or ethyl residues, but are bound, once preferred with regard to the selection of the three. The remainder are preferably organic Required siloxane components for the mixtures, 65 residues methyl residues. Such connections can each of the specific conditions must be produced by customary processes / within For example, component (3) must with the compo these specified limits, the constituents (2) components (1) and (2) may be incompatible, on the other hand, any combination of siloxane units

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of the formulas contain: PhSiO _{3 2} , Ph, SiO, PhRSiO,,

RSiO ₃₁₂ , R ₂ SiO, R ₃ SiO ₁₁₂ , PhR ₂ SiO ₁ ",, Ph ₂ RSiO ₁ ,., Example 1

and SiO ₄ ; ₂ , wherein Ph is phenyl radicals and R is carbon. The above composition was based on

hydrogen radicals, such as lower alkyl radicals, means. various, below-mentioned cookware in the form

The components (3) used according to the invention are applied to a thin, uniform film and

Deten mixtures with the usual ingredients are left to dry for 10 minutes. The overlay was

Compatible tin salt catalysts, including cured at 177 "C for 20 minutes. The

stand is that these salts either directly in the mass was applied to the following dishes:

Mixture of (1) and (2) or in one for all three non-electric stainless steel frying pan,

Components are soluble in suitable solvents. io non-electric frying pans made of aluminum,

The upper limit for the amount of tin salt used electric frying pans made of heavy iron, electric

is not critical. ■. . Iron frying pans and a ceramic baking pan.

From the Belgian patent specification 591 767, the following dishes were heated in these dishes, already the use of mixtures of silicone that could be easily removed: eggs, resins, alkyl zirconates and orthosilicic acid esters 15 pork, veal, minced meat, sauce, " as a mold release agent for rubber mixtures and braised beef, spaghetti with tomato sauce, ham, other plastics are known that make taking out pancakes or fried chickens. The food left facilitate the pressed article from the mold. not only easy to take out, but that Mixtures of this type are, however, also easily removed from residues for the pans of the invention Intended use not usable, as cleaning 20, even if the food thoroughly those listed in connection with Example 2 were burned. The ease of cleaning is one of the the same attempt is clearly evident. Main advantages of the mold release liners accordingly

The mixtures used according to the invention are the use according to the invention, and the necessary

advantageous in the form of a solution in an organic manoeuvrable work for cleaning dirty

Solvents that are less than 10% of the stock 25 cookware will decrease as the burned

parts (1) and (2), based on the total weight of the residue, can be easily removed with cleaning agent

Solution, contains, on the surface of the cooking and are, without the pan with a pot clearing

Applied baking dishes. For this purpose, any need to be cleaned '.

suitable solvents can be used, e.g. B. When using harnesses that are compatible with the

Petroleum ether, toluene, xylene or chlorinated solution 30 coated mold release coatings according to the invention

such as perchlorethylene, 1,1,1-trichloroethane or, the use of abrasives should

Methylene chloride. Usually, non-toxic materials will be avoided in order to prevent the coating from breaking

non-flammable solvents are preferred, as they prevent, and when using metal scrapers

Mixtures used in accordance with the invention, in the first place, care should be taken for the same reason,

are suitable for household use. However, the coating of any one will break

if the mixtures used according to the invention are not the reason, it can easily be done by applying more

on the use of such solvents apply mass to the fracture point and subsequent hardening

restricts. of the film repaired in the above-mentioned way

The mixtures used according to the invention can be. '

applied in any way to the cooking vessels 4 ° B e rs the 1 2
e.g. by brushing on, dipping or

Spray on. These mixtures are particularly suitable for the use of the following resinous phenyl

Suitable for packaging in aerosol containers that have a polysiloxane for 1 in place of the above

uniform spraying on the top of the cooking vessel - also achieves an excellent separating effect:

enable areas. 45 resin with 3 percent by weight Si-bonded hydroxyl

The mixtures used according to the invention are groups, a phenyl / Si ratio of 1: 1 and

suitable for all types of cooking vessel surfaces, a methyl / Si ratio of 0.5: 1.

eg for steel, copper, aluminum, ^ceramics,: ..,

Tin or magnesium surfaces. Furthermore can. Comparative experiment

the mold release coatings made from the inventive 50 following ingredients were at room temperature

Mixtures used to remove all types of mixed together:

Foodstuffs, such as bread, cakes, eggs, meat, 60 g of a silicone resin of 30 parts by weight

Vegetables or combinations thereof, using phenylsiloxanes and 75 parts by weight of me-

^We i ^e V ·· «· -7 α thylsilpxanen,

For the quantitative composition of the 55 ₃₀ orthosilicic acid ethyl ester,

Mixtures used according to the invention serve the following 10 g of octyl zirconate and

^Be ' ^s P' ^el:. , _t . . . ": ·."'■ _. ■■■ '-, ■,, 50 g anhydrous toluene.
3 percent by weight of a resinous phenylmethyl

polysiloxane with 3.5 percent by weight Si-bonded This liquid mixture was based on an aluminum hydroxyl group, A phenyl / Si ratio of 60 frying pan and 15 minutes at 150 "C 0.56: 1 and a methyl / Si ratio of 0.79: 1. The mixture was found to be the 0.5 percent by weight of a liquid methylpolysiloxane pan very poorly wetted.

with 3.5 percent by weight of Si-bonded hydroxyl after hardening of the coating on the aluminum groups and 963 percent by weight of 1,1-trichloroethane. Frying pan were in the same eggs without fat or This mixture contains 1% tin, based on the oil addition at a temperature of 135 to 19O ⁰ C total weight of the polysiloxanes, in the form of fried. The eggs burned very badly and stannous octoate with a content of 14.15% by weight could not be removed from the pan. Percent tin was added to the pan. had to be cleaned with steel wire.

This experiment clearly shows that the mold release agents according to Belgian patent 591767 as mold release coatings for food in cooking and baking appliances are not suitable.

Claims (2)

Patent claims: 1. Use of mixtures of (1) 10 to 35%, based on the total weight of (1) and (2). liquid methylpolysiloxanes with a hydroxyl group content of at least 2 percent by weight, (2) 65 to 90%, based on the total weight of (1) and (2), resinous phenyl and optionally alkyl-substituted polysiloxanes with a hydroxyl group content of at least 3 percent by weight, a ratio of phenyl radicals to Si atoms of at least 0.2: 1 and a ratio of all hydrocarbon residues present to Si atoms from 1.2 to 1.7: 1 and (3) tin salts of carboxylic acids compatible with (1) and (2) in amounts that on 150 parts by weight of the total weight of (1) and (2) at least 1 part by weight of tin is available, for the production of food-repellent coatings on cookware and bakeware. 2. Use of mixtures according to claim 1 in the form of a solution in an organic Solvents that are less than 10% of the Components (1) and (2), based on the total weight of the solution, contains.