CS199766B1 - Process for the modification of atactic polypropylene - Google Patents

Description

The invention provides a method of modifying atactic polypropylene with propylene oil in order to modify its adhesive properties. Atactic polypropylene treated in this way is suitable for application as an insect glue.

Research in the field of plant protection is increasingly oriented towards non-traditional non-chemical methods. In order to protect the human environment and to minimize disruption of biocoenoses, methods for reducing the population density of insect species using their visual or chemical orientation - pheromones have recently been developed. In this way, a method of combating insects with the help of a wave trap was developed. Until now, however, it could not be applied more widely due to the lack of suitable adhesive. In experiments with visual scavengers, glues mainly based on acrylates were used. The drawback of these glues is their universality, as they capture insects of all sizes, thus prematurely depleting the capacity of the insect trap and their relatively high cost.

This problem is solved by the present invention in which an appropriate modification of atactic polypropylene results in an insect glue.

SUMMARY OF THE INVENTION The present invention provides a process for the modification of atactic polypropylene which is characterized in that atactic polypropylene having a molecular weight of 1.5 to 12 < ^{4 >}

199 7β at a temperature of 110 to 140 ° C with β polypropylene oil having a viscosity of 29 to 1000 oP steam at 25 ° C where the weight ratio of atactic polypropylene to propylene oil is 2 to 1 t

The atactiocylene polypropylene used is a waste product in the production of isotactic polypropylene. Modified polypropylene is applied in the form of a coating on a suitable substrate · The paint is non-drying, transparent and, due to its suitable adhesive properties, captures smaller insects, such as cherries, while large insects may fly away and thus prevent premature exhausted capacity of the trap

Example 1

The atactioc polypropylene is extracted at room temperature with diethyl ether, followed by filtration to remove insoluble constituents (predominantly stereoblocks), precipitate with methanol and dry first under infra-lamp, and then for 3 hours at 100 ° C under vacuum. 110 ° C with polypropylene oil having a viscosity of 3 ° cP / 25 ° 0 in a ratio of 1 l to obtain a homogeneous paste suitable for application ·

Example 2

Atactic polypropylene of molecular weight oca 115000 is heated to 140 to 150 ° C for one hour without pre-cleaning (ie with the presence of other constituents present) to remove moisture from the surface components. Propylene viscosity oil is then mixed into hot polypropylene 1000 cP / 25 ° 0 in li4 ratio · The obtained homogeneous paste is film-forming and has the desired adhesive properties ·

Example 5

29000 low molecular weight atactic polypropylene is mixed with propylene oil (1000 oP at 25 ° 0 in proportions) and stirred to obtain a homogeneous composition of the desired adhesive and rheological properties without premature purification after heating for one hour at 140 ° 0.

Example 4

Low molecular weight atactic polypropylene of 18,000 molecular weight is mixed at 110 ° C without pre-purification with a propylene oil fraction (boiling point up to 170 ° C at 3 torr, viscosity 29 ° P / 25 ° 0) at a ratio of 2tl to yield paste of suitable consistency and properties ·

Claims (1)

Process for modifying atactic polypropylene, characterized in that atactiocylene polypropylene having a molecular weight of 1.5 to 12 χ 10 * is homogenized at 110 to 140 ° C with β polypropylene oil having a viscosity of 25 to 1000 oP at 25 ° 0, the atactioc or polypropylene weight ratio being of propylene oil It is 2 <1 to lt5 ·