Compartmentalized resin pellets
Disclosed herein is a resin pellet and a process to make said resin pellet. The resin pellet comprises a major polyester comprising a catalytic titanium compound, and a minor polyester comprising a phosphorus compound. The major polyester is present in a first compartmentalized zone of the resin pellet and the minor polyester is present in a second compartmentalized zone of the resin pellet.
1. A process for maintaining the catalytic activity of a catalytic titanium compound in a polyester resin during polymerization comprising the steps of:
A. melt phase polymerizing a first polyester comprising the catalytic titanium compound in the absence of a deactivating amount of a phosphorus compound,
B. manufacturing a compartmentalized pellet comprising a first compartmentalized zone and a second compartmentalized zone wherein the first compartmentalized zone comprises the first polyester and the second compartmentalized zone comprises a second polyester comprising a phosphorus compound,
C. blending the compartmentalized resin pellet into an article by melt mixing and making an article,
wherein the amount of phosphorus from the phosphorus compound to the amount of titanium from the catalytic titanium compound in step A is in a mole ratio selected from the group consisting of at least 0.1:1.0, at least 0.2:1.0, at least 0.5:1.0, at least 0.7:1.0, and at least 1.0:1.0.
2. The process of claim 1 , wherein the second polyester comprises a deactivated titanium compound.
3. The process of claim 1 , wherein the titanium from the catalytic titanium compound is present in the first polyester at a level selected from the group consisting of between 2 ppm and 400 ppm, between 2 ppm and 300 ppm, between 2 ppm and 100 ppm, and between 2 ppm and 20 ppm.
4. The process of claim 1 , wherein the catalytic titanium compound is selected from the group consisting of titanium alkoxides and their derivatives, titanium complex salts, titanium complexes with hydroxycarboxylic acids, titanium dioxide-silicon dioxide-co-precipitates, and hydrated alkaline or alkaline earth salts-co-titanium dioxide.
5. The process of claim 1 , wherein the phosphorus from the phosphorus compound is present in the second polyester at a level selected from the group consisting of between 1 ppm and 20000 ppm, between 1 ppm and 10000 ppm, between 1 ppm and 5000 ppm, between 1 ppm and 1000 ppm, between 1 ppm and 700 ppm, between 1 ppm and 500 ppm, between 1 ppm and 300 ppm, and between 1 ppm and 200 ppm.
6. The process of claim 1 , wherein the phosphorus compound is selected from the group consisting of phosphate acids or esters or combinations thereof, phosphite esters, phosphonic acids or esters or combinations thereof, phosphinic acids or esters or combinations thereof, phosphines which do not catalyze the reaction of acetaldehyde with oxygen, phosphine oxide, and phosphorus pentoxide.
7. The process of claim 1 , wherein the first polyester and the second polyester are of the same polyester composition.
8. The process of claim 1 , wherein the first polyester and the second polyester comprise at least 90% by weight of the compartmentalized pellet.
9. The process of claim 1 , wherein the first compartmentalized zone is a sheath and the second compartmentalized zone is a core.
10. The process of claim 9 , wherein the core is encapsulated by the sheath.
11. The process of claim 1 , wherein the second compartmentalized zone is a sheath and the first compartmentalized zone is a core.
12. The process of claim 11 , wherein the core is encapsulated by the sheath.
13. The process of claim 1 , wherein the first compartmentalized zone is a first layered sheet and the second compartmentalized zone is a second layered sheet.
14. The process of claim 13 , wherein the first layered sheet is next to the second layered sheet.
15. The process of claim 1 , wherein the compartmentalized pellet in step B further comprises a third compartmentalized zone wherein the first compartmentalized zone is a first layered sheet, the second compartmentalized zone is a second layered sheet, the third compartmentalized zone is a third layered sheet, the second polyester is present in the second compartmentalized zone and the first polyester is present in the first compartmentalized zone and the third compartmentalized zone.
16. The process of claim 15 , wherein the second layered sheet is between the first layered sheet and the third layered sheet.
17. The process of claim 1 , wherein the first compartmentalized zone and the second compartmentalized zone are configured in a side-by-side configuration whereby neither compartmentalized zone surrounds the other compartmentalized zone in any plane of the pellet.
18. The process of claim 1 , wherein the first compartmentalized zone is void of any deactivated titanium compound.
19. The process of claim 1 , wherein the first compartmentalized zone is void of any phosphorus compound.