DE928793C - Solvents, swelling agents or plasticizers - Google Patents

Description

Polytrifiuorchloräthylen is distinguished from other synthetic substances hochpolynieren by the fact that its softening point is very high (240 ^{to 0} or higher) and the solubility in inorganic or organic substances is very low. Both properties represent a great advantage for the use of the polymer in practice, but on the other hand they also make shaping difficult, e.g. B. in the production of films, threads and the like. There is therefore an urgent need to find useful, not too high-boiling solvents and swelling agents.

So far, some compounds containing both fluorine and chlorine have been found to be useful Solvent proven. But these substances have the disadvantage that they are very expensive and at the shape of the polymer can only be partially recovered. It is therefore after as before necessary to find more economically accessible solvents and swelling agents that either can be used on their own or in a mixture with the expensive solvents.

It has now been found that hydroaromatic hydrocarbons of the cyclohexane, cyclopentane, Menthane, camphane and pinane series, as well as the diterpene series, which have at least one C = C bond and contain at least one alkyl, alkylene or alkylidene group, useful solution, swelling and are co-solvents or plasticizers for trifluorochloroethylene. With their help Available pastes, solutions can be processed into coatings, tapes, etc. in a simple manner.

A polytrifluorochloroethylene was used as the starting substance for the examples described below, whose molecular weight according to that of

Kaufman and Mathana, J. Polymer. Science 6, 251 (1951) specified »NST« - and osmotic Values is around 75,000. The concentration of polytrifluorochloroethylene is in the examples generally about 3%.

example 1

Table 1 shows the solubility behavior of the Polytrifluorochloroethylene in dipentene-i, 2, 3-trihlorpentachloropropane mixtures (Mixing ratio in parts by volume)

Table 1

Dipents CFCl ₂ - CFCl - CFCLi Solution temperature I.
2
3
9 HHHH 140 °
145 °
155 °
165 °

Dipentene behaves similarly when mixed with o-chlorobenzotrifluoride.

B e i s ρ i e 1 2

For the same mixing ratios as in table ι, the solution temperatures are 140 to 150 ⁰ when using the petroleum fraction referred to as naphtha, i.e. the fractions of petroleum, shale oil, tars, etc., which boil ^{below 250 to 300 0.}

Example3

Table 2 shows the solubility behavior of polytrifluorochloroethylene in dicyclopentadiene-ο-chlorobenzotrinuoride mixtures.

Table 2

Dicyclopentadiene

I.
2

o-chlorobenzotrifluoride

Solution temperature

130
140 ^c
150 ^c

Example 4

The solution temperatures of polytrifluorochloroethylene in mixtures of / 3-pinene and o-chlorobenzotrifluoride are listed in Table 3.

Table 3

jS pinene o-chlorobenzotrifluoride Solution temperature I.
3 I.
I. 130 °
140 °

Behave similarly to the hydrocarbons mentioned in the four previous examples substances such as vinylcyclohexene, methylcyclohexene, camphene, phellandrene, terpinolene, methylcyclohexadiene and other.

Substances of the same type can also serve as plasticizers for Polytrifluorchloräthylenformstücke, only to then expediently be at least 300 ⁰ at atmospheric pressure, the boiling point. So you get z. B. made of polytrifluorochloroethylene and diterpenes films that are soft and pliable, in contrast to the hard, plasticizer-free films.

Claims (2)

'' PATENT CLAIMS: 1. Use of hydroaromatic hydrocarbons the cyclopentane, cyclohexane, menthane, camphane and pinane series and the diterpene series, which have at least one carbon double bond and contain at least one alkyl, alkylene or alkylidene group as a solvent, Swelling agent or plasticizer and extender for polytrifluorochloroethylene, optionally together with other solvents. 2. Use of boiling above about 300 ⁰ at atmospheric pressure compounds according ι as plasticizers for polytrifluorochloroethylene to spell. Referred publications:
U.S. Patent No. 2,542,070. © 509513 6.55