DE1233589B - Stabilization of polymers or copolymers of halogenated vinyl compounds or of chlorinated paraffins - Google Patents

Description

GERMAN wffik PATENT OFFICE German class: 39 b -22/06

EDITORIAL

Number: 1233 589

File number: A 21569IV c / 39 b

1233 589 Filing date: May 19, 953

Opened on: February 2, 1967

High molecular weight organic products containing chlorine, in particular polyvinyl chloride and its copolymers, tend to discolour in the heat and to deposit small particles on the surface of the Moldings made from these products, phenomena known as efflorescence.

Certain organic derivatives of tetravalent tin such as dibutyltin maleate and the analogous laurate are already known as stabilizers for polyvinyl chloride; however, they are not sufficiently effective. she furthermore have the disadvantage that they are not quite at the high temperatures involved in processing polyvinyl chloride to be stable, which causes discoloration of the plastic masses. Dibutyltin maleate leads in addition, difficulties in processing due to gluing on the calender surfaces.

It has now been found that certain derivatives of tetravalent tin are far better stabilizers. According to the invention, organotin compounds of the general formula R _ra - Sn - X ₄ - », where ao R is an alkyl or aryl group or a hydroaromatic or heterocyclic radical, η stands for the numbers 1 or 2 or 3 and X stands for the radical of an ester from a Mercaptocarboxylic acid with 2 to 4 carbon atoms and a glycol with 2 to 6 carbon atoms is used for stabilizing polymers or copolymers of halogen-containing vinyl compounds or of chlorinated paraffins.

The manufacturing process for these connections is in the documents of the German patent 1020 335 described.

An example of such a compound is the reaction product of the ethylene glycol ester of thioglycolic acid with dibutyltin oxide, which in its monomolecular form has the following configuration:

(C ₄ H ₉ ) ₂ Sn:

. S - CH, - COO - CH,

S-CH ₂ - COO - CH ₂

example 1

100 parts by weight of vinyl chloride / vinyl acetate copolymer, 50 parts by weight of dioctyl phthalate and 2 parts by weight of the product formulated above as a stabilizer are mixed for one hour. The whole mass is then placed in a Banbury machine and heated to 150 ° C for 10 minutes. From there it is fed to rollers, which are also heated to 150 ° C, and then fed to a calender with three or four rollers. The temperature of the calender is between 138 and 172 ° C. The copolymer stabilizes polymers or
Copolymers of halogenated vinyl compounds or of chlorinated paraffins

Applicant:

Argus Chemical Laboratory Inc.,
Brooklyn, NY (V. St. A.)

Representative:

Dr.-Ing. F. Wuesthoff, Dipl.-Ing. G. Pulse
and Dr. E. Frhr. v. Pechmann, patent attorneys,
Munich 90, Schweigerstr. 2

Named as inventor:

William E. Leistner, Brooklyn, N.Y .;

William E. Setzier,

Nassau County, N.Y. (V. St. A.)

Claimed priority:

V. St. v. America May 23, 1952 (289 683) - -

is processed into a film with a thickness of 0.1 mm or another thickness, as required. These The film can be heated to 170 ° C. for one hour without any discoloration; she shows good lightfastness.

Example 2

Chlorinated paraffin with a chlorine content of 40% is heated to 66 ° C for 12 hours and nitrogen blown through. The paraffin loses 10% chlorine. If the same paraffin 3% of that mentioned in the example Stabilizer are added, the chlorine loss is only under otherwise identical conditions about 1% ■

Claims (1)

Claim: Use of organotin compounds of the general formula R _jl - Sn - X ₄ - », in which R is an alkyl or aryl group or a hydroaromatic or heterocyclic radical, η stands for the number 1 or 2 or 3 and X stands for the radical of an ester from a mercaptocarboxylic acid with 2 to 4 carbon atoms and a glycol with 2 to 6 carbon atoms, for stabilizing polymers or copolymers of halogen-containing vinyl compounds or of chlorinated paraffins.