DE1570596A1 - Process for the production of polyurethane plastics - Google Patents

Description

FARBENFABRIKEN BAYER AG

LEVERKUSEN-fctycnmk August 12, 1965 ifcttat-AbttUuBf Hb / ES

Dr. Expl.

Process for the production of polyurethane plastics *

Addition to patent ... (patent application F 44 639 IVd / 39c)

Patent (patent application P 44 639 IVd / 39c) concerns

a process for the production of polyurethane plastics from predominantly linear polyurethane compositions produced in a known manner on the basis of compounds with reactive hydrogen atoms with a molecular weight of 300-10,000, polyisocyanates and optionally chain extenders with reactive hydrogen atoms and is characterized in that during the production the polyurethane compound is used with at least one hydrogen atom reacting with isocyanate groups and at least one salt-like or salt-forming group, and in the case of using compounds with groups capable of salt formation, the resulting polyurethane compound is then at least partially converted into salt form in a manner known per se , the proportion by weight of the eel-like groups being more than 1 $> and at most 15 ^, in the case of carboxyl groups at most 8 $> .

The reaction in organic solvents is preferred carried out and then the solvent

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constantly or largely replaced by water.

In this way, emulsifier-free, stable, aqueous, anionic polyurethane dispersions can be obtained which have the Polyurethanes open up new application possibilities

In a further development of the method according to the main patent, it has now been found that compounds with reactive hydrogen atoms with a molecular weight of more than higher molecular weight compounds can also be used as compounds with reactive hydrogen atoms than 10,000 and a maximum of 20,000.

for the other starting materials and for the implementation the procedure is based on the information in the main patent

The compounds with reactive hydrogen atoms with a molecular weight of 10,000 - 20,000 are preferably linear and have terminal hydroxyl, carboxyl, amino or mercapto groups. Polyhydroxy compounds such as polyesters, polyacetals, polyethers, polythioethers and polyamides are preferred and polyester amides.

As polyethers, the polymerization products of ethylene oxide, Propylene oxide, tetrahydrofuran, butylene oxide, as well as theirs Mixed or graft polymerization products as well as the through

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Condensation of polyhydric alcohols or mixtures thereof and the alkoxylation of polyhydric alcohols, Amines, polyamines and amino alcohols called polyethers

Possible polyacetals are, for example, the compounds which can be prepared from hexanediol and formaldehyde.

As polythioethers, for. B. the condensation products of thiodiglycol and its mixtures with other glycols or Mention polyhydroxy compounds.

Polyesters, polyester amides and polyamides used in the process according to the invention are polyvalent saturated polyesters and unsaturated carboxylic acids and polyhydric saturated and unsaturated alcohols, amino alcohols, diamines, polyamines and their mixtures obtained predominantly linear polycondensates such as polyterephthalates, polyadipates or polycarbonate use.

Also higher molecular weight ones already containing urethane or urea groups Connections are operational. Likewise, optionally modified natural polyols such as castor oil and Carbohydrates can be used.

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Mixtures can be used to vary the lyophilicity or hydrophobicity and the mechanical properties of the process products various polyhydroxy! compounds with a molecular weight of over 10,000 to 20,000 can be used. Also is it is possible to use mixtures of the invention Use polyhydroxyl compounds with those of the main patent.

Example 1:

350 g of a polyester obtained by polycondensation from adipic acid and diethylene glycol (OH number 10.0) with a molecular weight of 11,200 is heated for half an hour 120 ° and 20 Torr dehydrated and reacted in two hours at 120 ° with 20 g of 1,6-hexane diisocyanate. The highly viscous melt is cooled, taken up with 900 ml of acetone and treated at 55 ° with an aqueous solution of 14.9 g of potassium ethylenediamine-I-propane 'sulfonate in 85 ml of water. Hach finished implementation 600 ml of water are added and the acetone is distilled off in vacuo at 55-60 °. 920 g of a stable emulsifier-free dispersion with a pH of 6 are obtained. the The dispersion dries at room temperature to form a soft, elastic, slightly sticky film.

Example 2;

700 g of adipic acid-diethylene glycol polyester (OH number 10) are after dehydration for half an hour at 120 ° Xm vacuum in a two-hour reaction at 110 ° with 45.6 g of toluene diisocyanate

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implemented. The melt is taken up with 400 ml of acetone and at 55 ° with 27.8 g of sodium ethylenediamine-N-propanesulfonate added to 170 ml of water. It is stirred at 55 °. After adding 1200 ml of water, the acetone is im Distilled off vacuum at 55 *. The result is a 39.2 # Dispersion that is stable without the addition of emulsifiers and from which, when the solvent is removed, becomes clear, elastic and soft films are obtained. The dispersion is precipitated by adding 2% hot magnesium sulfate solution, with concentrated However, it is compatible with aqueous ammonia solution.

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Claims (1)

Le A 9610 sheet claim to action: Process for the production of polyurethane plastics on the basis of compounds with reactive Hydrogen atoms with a molecular weight of 300 - 10,000, Polyisocyanates and optionally chain extenders predominantly linear polyurethane compositions produced with reactive hydrogen atoms in a manner known per se, wherein in the production of the polyurethane composition a compound with at least one reactive with isocyanate groups Oxygen atom and at least one salt-like group or group capable of salt formation is also used, and in the case of the use of compounds with groups capable of salt formation, the resulting polyurethane composition is then converted at least partially into salt form in a manner known per se, the proportion by weight of the salt-like groups being greater than 1 % and a maximum of 15 #, in the case of carbonyl groups, a maximum of £ 8, according to the patent ... (Patent application F 44 639 IVd / 39c), characterized in that that as compounds with reactive hydrogen breaths now wholly or partially those with a molecular weight of more than 10,000 and at most 20,000 are used will. Le A. 9610 - 6 - 909830/1420