METHOD FOR PRODUCING POLYOLEFIN RECYCLATES
First Claim
1. A method for producing a polyolefin recyclate, suitable for production of consumer products, from mixed-color, polyolefin-containing wastes, comprising the steps of(i) treating a mixed-color polyolefin waste fraction with water, without supplying thermal energy,(ii) treating the polyolefin waste fraction obtained from (i) by washing with an alkaline medium at a temperature of at least 60°
- C.,(iii) flake-sorting the polyolefin waste fraction obtained from (ii) to give one or more single-color polyolefin waste fractions, each comprising a polyolefin in concentrated form, where steps (ii) and (iii) may also be carried out in the opposite order,(iv) treating the one or more single-color polyolefin waste fractions obtained from the preceding steps, at a temperature in the range from 50 to 155°
C., preferably for a period of at least 60 minutes.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a method for producing polyolefin recyclates, in particular HDPE recyclates. In a specified sequence, color-mixed polyolefin-containing groups are washed at a low temperature, washed at an increased temperature in an alkaline medium, flake-sorted, and treated at an increased temperature in order to remove migration materials. By virtue of the aforementioned method, polyolefin recyclates can be obtained with a substantially improved degree of purity compared to hitherto commercially available recyclates, said recyclates being usable in the production of novel consumer product packaging. Additionally, unpleasant odors connected to known polyolefin recyclates due to the decomposition products of migration materials formed during the extrusion process are largely prevented.
-
Citations
16 Claims
-
1. A method for producing a polyolefin recyclate, suitable for production of consumer products, from mixed-color, polyolefin-containing wastes, comprising the steps of
(i) treating a mixed-color polyolefin waste fraction with water, without supplying thermal energy, (ii) treating the polyolefin waste fraction obtained from (i) by washing with an alkaline medium at a temperature of at least 60° - C.,
(iii) flake-sorting the polyolefin waste fraction obtained from (ii) to give one or more single-color polyolefin waste fractions, each comprising a polyolefin in concentrated form, where steps (ii) and (iii) may also be carried out in the opposite order, (iv) treating the one or more single-color polyolefin waste fractions obtained from the preceding steps, at a temperature in the range from 50 to 155°
C., preferably for a period of at least 60 minutes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- C.,
Specification