Stabilized aliphatic polyester compositions
AssigneeEastman Chemical Company
InventorsJason Clay Pearson, Gether Irick, Jr.
Life of this patent
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Abstract
Disclosed are stabilized aliphatic polyester compositions comprising an aliphatic polyester, a HALS, and a tris-aryl-S-triazine UV absorber that show low embrittlement, haze formation, and discoloration during weathering. Also disclosed are aliphatic polyester compositions comprising aliphatic polyester, a hindered amine light stabilizer, a triazine UV absorber, and a phosphite that exhibit low color prior to weathering but retain good clarity, color, and excellent impact strength after exposure to weathering conditions. The aliphatic polyester compositions may be used prepare shaped articles such as, for example, films, sheets, bottles, tubes, profiles, fibers, and molded articles.
Claims15
A stabilized, aliphatic polyester composition, comprising:
- (A) at least one aliphatic, thermoplastic polyester comprising residues of at least one substituted or unsubstituted, linear or branched, dicarboxylic acid selected from aliphatic dicarboxylic acids containing 2 to 18 carbon atoms and cycloaliphatic dicarboxylic acids containing 5 to 10 carbon atoms;
- and residues of at least one, substituted or unsubstituted, linear or branched, diol containing 2 to 18 carbon atoms selected from aliphatic diols, polyalkylene ether glycols, and cycloaliphatic diols;
- (B) at least one hindered amine light stabilizer selected from one or more compounds having formulas (1) and (3):
- wherein
- R3, R4, R5, and R6 are C1-C22 alkyl;
- R7 and R8 are independently selected from hydrogen, C1-C22 alkyl, and C1-C22 alkoxy;
- Y1 is —O—;
- L1 is the divalent linking group —C(O)-L2-C(O)—;
- L2 is C1-C22 alkylene;
- and
- R11 is selected from hydrogen, C1-C22 alkyl, substituted C1-C22 alkyl, and radical A, wherein radical A has the following structure:
- wherein * designates the position of attachment;
- (C) at least one tris-aryl-S-triazine UV-absorber;
- and
- (D) at least one pentaerythritol diphosphite,
- wherein the ratio, on a weight/weight basis, of the at least one hindered light amine stabilizer to the at least on one tris-aryl-S-triazine UV absorber ranges from about 2:1 to about 0.2:1.
A stabilized, aliphatic polyester composition, comprising:
- (A) at least one thermoplastic, aliphatic polyester comprising about 80 to 100 mole percent, based on a total of 100 mole percent dicarboxylic acid residues, of the residues of at least one dicarboxylic acid selected from 1,4-cyclohexanedicarboxylic acid and 1,3-cyclohexanedicarboxylic acid and about 10 to 100 mole percent, based on a total of 100 mole percent diol residues, of the residues of at least one diol selected from 1,4-cyclohexanedimethanol;
- ethylene glycol;
- diethylene glycol;
- 1,3-cyclohexanedimethanol;
- 1,4-butanediol;
- and 2,2,4,4-tetramethyl-1,3-cyclobutanediol;
- (B) about 0.1 to about 2 weight percent, based on the total weight of said composition, of at least one hindered amine light stabilizer selected from compounds having formula (1)
- wherein
- R3, R4, R5, and R6 are methyl groups;
- R7 is methyl, C8H17O—, or hydrogen;
- Y1 is —O—;
- L1 is the divalent linking group —C(O)-L2-C(O)—;
- and
- L2 is C8 alkylene;
- (C) about 0.1 to about 6 weight percent, based on the total weight of said composition, of at least one tris-aryl-S-triazine UV-absorber selected from compounds having formula (5):
- wherein
- R15 and R16, are hydrogen;
- R13, R14, R17, and R18 are hydrogen or methyl;
- and
- R19 is —OC6H13 or —OC8H17;
- and
- (D) about 0.1 to about 2 weight percent, based on the total weight of said composition, of at least one pentaerythritol diphosphite selected from compounds having formula (6):
- wherein
- R1 and R2 are each isodecyl, octadecyl, or 2,4-di-tert-butylphenyl, and
- wherein the ratio, on a weight/weight basis, of the at least one hindered light amine stabilizer to the at least one tris-aryl-S-triazine UV absorber ranges from about 2:1 to about 0.2:1.
Dependencies are inferred from the claim text.