UV stabilization of isosorbide polycarbonates
View Patent ↗Provided herein are polymeric compositions that are suitable protected from UV-induced discoloration and degradation. Such resins comprise an isosorbide polymer and one or more hindered amines. These resin compositions are useful in the manufacture of various shaped, formed and/or molded articles.
1. A composition comprising:
(a) an isosorbide polycarbonate polymer; and
(b) bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate.
2. The composition of claim 1 , further comprising at least one of the following impact modifiers: styrene-butadiene-styrene (SBS), styrene-butadiene rubber (SBR), styrene-ethylene-butadiene-styrene (SEBS), ABS (acrylonitrile-butadiene-styrene), acrylonitrile-ethylene-propylene-diene-styrene (AES), styrene-isoprene-styrene (SIS), methyl methacrylate-butadiene-styrene (MBS), styrene-acrylonitrile (SAN), or combination thereof.
3. The composition of claim 2 , wherein the impact modifier is MBS.
4. The composition of claim 2 , wherein impact modifier is SEBS.
5. The composition of claim 2 , further comprising at least one of the following UV stabilizers: hydroxybenzophenones, hydroxyphenyl benzotriazole, cyanoacrylate, oxanilide, hydroxyphenyl triazine or a combination thereof.
6. The composition of claim 1 , wherein the bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate is at a weight percent below 0.3%.
7. The composition of claim 1 , wherein the isosorbide of the polymer is derived from at least one of the following isosorbides: 1,4:3,6-dianhydro-D-sorbitol; 2,6-dioxabicyclo[3.3.0]octan-4,8-diol; 1,4:3,6-dianhydro-D-glucitol; 2,3,3a,5,6a-hexahydrofuro[3,2-b]furan-3,6-diol, or an isomer thereof.
8. The composition of claim 1 , wherein the polymer is a homopolymer.
9. The composition of claim 1 , wherein the polymer is a copolymer.
10. The composition of claim 1 , wherein the polycarbonate is
wherein n is greater than 1.
11. The polycarbonate of claim 1 , wherein the polycarbonate is
wherein z is an aromatic compound and n is greater than 1.
12. An article comprising the composition of claim 1 .
13. A method of manufacturing an article comprising:
(a) extruding the composition of claim 1 ; and
(b) molding the extruded composition into an article.
14. The article formed from the method of claim 13 .
15. The composition of claim 1 , wherein the polymer comprises at least 20 weight of a biologically-based unit.
16. The composition of claim 15 , wherein the biologically-based unit is isosorbide.
17. A composition comprising:
(a) between 90 and 95 wt % isosorbide polycarbonate;
(b) between 4 and 8 weight % SEBS impact modifier;
(c) optionally between 0.1 and 0.6 wt % of an antioxidant;
(d) optionally between 2 wt % and 6 wt % of titanium dioxide;
(e) optionally between 0.1 and 0.5 wt % of plasticizers, lubricants and/or mold release agents and/or other additives; and
(f) between 0.1 and 0.5 wt % of bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate.
18. The composition of claim 17 , wherein the composition comprises between 0.15 and 0.30 wt % of bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate.
19. The composition of claim 17 further comprising between 0.01 and 0.05 wt % of a solution of 33 wt % NaOH in water.
20. An article comprising the composition of claim 16 .
21. An article comprising the composition of claim 17 .
22. An article comprising the composition of claim 18 .
23. An article comprising the composition of claim 19 .
24. The composition of claim 1 , wherein the composition does not comprise the following UV stabilizers:
, or
,
, or
.