Methods and compositions related to recycling polymer waste
Polymer compositions, for example, recycled polymer compositions, processes for the production thereof, functional fillers for use in the polymer compositions, and articles formed from the polymer compositions.
1. A functional filler comprising:
an inorganic particulate material, wherein the inorganic particulate material has a d 50 of less than about 10 μm; and
a coating comprising a first compound including a terminating propanoic group or ethylenic group with one or two adjacent carbonyl groups,
wherein the first compound has the following formula:
A-(X—Y—CO) m (O—B—CO) n OH
wherein:
A is a moiety containing a terminating ethylenic bond with one or two adjacent carbonyl groups;
X is O and m is 1 to 4 or X is N and m is 1;
Y is C 1-18 -alkylene or C 2-18 -alkenylene;
B is C 2-6 -alkylene;
n is 0 to 5;
provided that when A contains two carbonyl groups adjacent to the ethylenic group, X is N.
2. A functional filler according to claim 1 , wherein the inorganic particulate has a d 50 ranging from about 0.5 μm to about 10 μm.
3. A functional filler according to claim 1 , wherein the inorganic particulate has a d 50 ranging from about 0.5 μm to about 2 μm.
4. A functional filler according to claim 1 , wherein the inorganic particulate has a d 50 ranging from about 0.5 to about 1.5 μm.
5. A functional filler according to claim 1 , wherein the inorganic particulate is ground calcium carbonate.
6. A functional filler according to claim 1 , wherein the first compound is present in the functional filler in an amount ranging from about 0.6 wt. % to about 1.2 wt. %.
7. A functional filler according to claim 1 , wherein the inorganic particulate material is selected from the group consisting of: an alkaline earth metal carbonate, sulphate, calcium carbonate, magnesium carbonate, dolomite, gypsum, a hydrous kandite clay, kaolin, halloysite, ball clay, an anhydrous kandite clay, a calcined kandite clay, metakaolin, fully calcined kaolin, talc, mica, perlite, diatomaceous earth, magnesium hydroxide, aluminium trihydrate, and combinations thereof.
8. A functional filler according to claim 1 , wherein the inorganic particulate is calcium carbonate, and wherein the functional filler further comprises talc as a secondary filler component.
9. A functional filler according to claim 8 , wherein the inorganic particulate is present in the functional filler in amount of at least 80% of the total dry weight of the mixed inorganic particulate and secondary filler component.